#!/usr/bin/env python3 """ Fine-Grained Sub-Discipline Semantic Matcher & Open-Question Synthesizer for UnsolvedEarth v1.2.0. Eliminates cross-subtopic collisions (e.g., core dynamo terms on subduction papers, magma terms on clay adsorption papers, or seafloor sediment terms on upper-ocean heatwave papers) by matching each candidate against 75+ specialized sub-discipline profiles across the 15 primary categories, and grounding >90% of statements directly in the paper's extracted open-problem clause. """ import re from governing_equations import GOVERNING_RELATIONS_BY_SUB_ID, normalize_mid_sentence_case # 75 specialized sub-discipline profiles (5 per category) using 100% valid taxonomy slugs SUBTOPIC_PROFILES = { 1: [ { "sub_id": "core_dynamo_inner_core", "keywords": r"\b(inner\s+core|outer\s+core|core-mantle|cmb|dynamo|geomagnetic|paleomagnetic|fe-ni|fe-si|fe7c3|superionic|anisotrop\w+\s+in\s+earth|geodynamo|magnetic\s+reversal|archeomagnetic|secular\s+variation)\b", "components": ["inner_core", "outer_core"], "media": ["core_alloy", "melt"], "processes": ["geomagnetic_dynamo", "mantle_convection"], "spatial_scale": "mantle_or_core_domain", "temporal_scale": "millennial_to_orbital", "depth_range": "2,891–6,371 km", "observables": [ "PKIKP body-wave travel-time residuals and normal-mode splitting functions", "satellite and paleomagnetic secular-variation field reconstructions", ], "inferred": [ "inner-core crystalline anisotropy, light-element partitioning, and outer-core convective buoyancy flux", "core-mantle boundary heat-flux heterogeneity and geomagnetic reversal thresholds", ], "forcings": "inner-core crystallization buoyancy flux and secular core cooling", "boundaries": "core-mantle boundary topography and heterogeneous lower-mantle thermal conductivity", }, { "sub_id": "lower_mantle_plumes_transition_zone", "keywords": r"\b(lower\s+mantle|transition\s+zone|llsvp|ulvz|mantle\s+plume|bridgmanite|post-perovskite|ringwoodite|wadsleyite|410\s*km|660\s*km|slab\s+stagnation|deep\s+mantle|hotspot|large\s+igneous\s+province)\b", "components": ["lower_mantle", "transition_zone"], "media": ["mantle_silicate", "rock"], "processes": ["mantle_convection", "metamorphic_transformation"], "spatial_scale": "mantle_or_core_domain", "temporal_scale": "multi_million_year_tectonic", "depth_range": "410–2,891 km", "observables": [ "full-waveform seismic tomography and P-to-S receiver-function discontinuity depths", "diamond-inclusion mineral physics and hotspot helium/tungsten isotope ratios", ], "inferred": [ "thermochemical density contrasts across Large Low-Shear-Velocity Provinces (LLSVPs)", "mantle transition-zone water storage capacity and viscosity stratification across 660 km", ], "forcings": "thermochemical mantle convection and deep slab negative buoyancy", "boundaries": " endothermic 660-km phase-transition clapeyron slopes and basal thermal boundary layers", }, { "sub_id": "subduction_slab_mantle_wedge", "keywords": r"\b(subduction|subducting|slab|mantle\s+wedge|arc\s+magma|back-arc|forearc|trench|wadati|slab\s+breakoff|slab\s+rollback|slab\s+window|slab\s+dehydration|serpentinite\s+channel|recycled\s+carbonate|carbonated\s+mantle|asthenospher\w+|upper\s+mantle|mantle\s+melting|metasomat\w+|peridotite|basalt\w*)\b", "components": ["subduction_zone", "upper_mantle"], "media": ["crystalline_rock", "magma_or_melt"], "processes": ["plate_subduction", "magma_generation_and_ascent"], "spatial_scale": "tectonic_plate_or_orogen", "temporal_scale": "multi_million_year_tectonic", "depth_range": "15–300 km", "observables": [ "high-resolution slab-interface seismic attenuation and magnetotelluric conductivity profiles", "arc-lava volatile ratios, oxygen fugacity (fO2) oxybarometry, and slab-fluid trace-element signatures", ], "inferred": [ "slab-to-wedge volatile and oxidant mass transfer rates and mantle-wedge corner-flow viscosity", "mechanical coupling and metamorphic dehydration kinetics along the plate interface", ], "forcings": "slab pull, trench rollback, and metamorphic dehydration reactions", "boundaries": "slab thermal age, incoming plate hydration state, and overriding-plate thickness", }, { "sub_id": "continental_rifting_breakup_margins", "keywords": r"\b(rift|rifting|breakup|break-up|passive\s+margin|rifted\s+margin|necking|extensional|back-arc\s+basin|mid-ocean\s+ridge|seafloor\s+spreading|oceanic\s+crust|transform\s+fault|detachment\s+fault)\b", "components": ["rift", "lithosphere"], "media": ["crystalline_rock", "magma_or_melt"], "processes": ["crustal_deformation", "magma_generation_and_ascent"], "spatial_scale": "sedimentary_basin_or_continental_margin", "temporal_scale": "multi_million_year_tectonic", "depth_range": "0–120 km", "observables": [ "deep-penetration marine multichannel seismic reflection and wide-angle refraction profiles", "syn-rift basin tectono-stratigraphy, GNSS extension rates, and dike-intrusion seismicity", ], "inferred": [ "rheological transition from brittle crustal necking to magma-assisted lithospheric breakup", "inherited structural weakness reactivation and asthenospheric decompression melt partitioning", ], "forcings": "far-field plate tensional stresses and asthenospheric upwelling buoyancy", "boundaries": "pre-existing crustal shear zones, lithospheric thermal structure, and magma supply rate", }, { "sub_id": "craton_orogen_continental_crust", "keywords": r"\b(craton|cratonic|orogen|orogenic|continental\s+crust|archean|proterozoic|ttg|delamination|drip|suture|collisional|tibetan|himalaya|lithospheric\s+mantle|crustal\s+growth|crustal\s+thickness)\b", "components": ["continental_crust", "orogen"], "media": ["crystalline_rock", "mantle_silicate"], "processes": ["crustal_deformation", "metamorphic_transformation"], "spatial_scale": "tectonic_plate_or_orogen", "temporal_scale": "multi_million_year_tectonic", "depth_range": "0–200 km", "observables": [ "crustal receiver-function Moho depth maps, Bouguer gravity anomalies, and xenolith thermobarometry", "zircon U-Pb/Hf-O isotopic arrays and whole-rock major/trace-element crustal compilations", ], "inferred": [ "secular continental crust growth versus recycling rates and lower-crustal foundry mechanics", "cratonic lithospheric root stability, metasomatic weakening, and orogenic lower-crustal flow", ], "forcings": "continental collision, lithospheric thickening, and convective removal of eclogitized lower crust", "boundaries": "Moho temperature, crustal radiogenic heat production, and cratonic keel composition", }, ], 2: [ { "sub_id": "earthquake_rupture_fault_mechanics", "keywords": r"\b(earthquake|rupture|fault|seismicity|aftershock|foreshock|coseismic|interseismic|postseismic|asperity|friction|seismogenic|ground\s+motion|focal\s+mechanism|strike-slip|normal\s+fault|thrust\s+fault)\b", "components": ["fault_zone", "continental_crust"], "media": ["crystalline_rock", "pore_water"], "processes": ["fault_rupture_and_slip", "crustal_deformation"], "spatial_scale": "fault_or_volcanic_edifice", "temporal_scale": "instantaneous_to_event", "depth_range": "0–35 km", "observables": [ "near-field broadband seismograms, high-rate GNSS displacements, and InSAR coseismic interferograms", "fault-zone drilling core microstructure and laboratory rotary-shear friction velocity dependence", ], "inferred": [ "rate-and-state frictional healing, dynamic pore-fluid pressurization, and rupture arrest thresholds", "partitioning between seismic radiation, fracture energy, and off-fault plastic damage", ], "forcings": "tectonic shear-stress loading and coseismic dynamic pore-pressure transients", "boundaries": "fault-zone geometric complexity, gouge mineralogy, and depth-dependent effective normal stress", }, { "sub_id": "slow_slip_tremor_megathrust", "keywords": r"\b(slow\s+slip|tremor|sse|ets|megathrust|low-frequency\s+earthquake|vlfe|subduction\s+interface|aseismic\s+slip|creep|plate\s+interface)\b", "components": ["subduction_zone", "fault_zone"], "media": ["crystalline_rock", "hydrothermal_fluid"], "processes": ["fault_rupture_and_slip", "plate_subduction"], "spatial_scale": "fault_or_volcanic_edifice", "temporal_scale": "synoptic_to_seasonal", "depth_range": "10–60 km", "observables": [ "seafloor borehole pressure gauges, continuous GNSS networks, and tectonic tremor catalogs", "seismic Vp/Vs ratios and magnetotelluric images of overpressured plate-interface fluids", ], "inferred": [ "effective normal stress and fault-valve permeability evolution across the brittle-ductile transition", "stress transfer from episodic tremor and slow slip (ETS) to locked megathrust asperities", ], "forcings": "subduction convergence loading and metamorphic fluid release along the downdip interface", "boundaries": "interface temperature profile, subducted sediment thickness, and fluid-drainage architecture", }, { "sub_id": "volcanic_plumbing_eruption_degassing", "keywords": r"\b(volcan\w+|eruption|magma|caldera|lava|pyroclastic|degassing|plumbing|phreatic|fumarole|conduit|ash|dike|sill|mush|vesiculation)\b", "components": ["magma_reservoir", "continental_crust"], "media": ["magma_or_melt", "hydrothermal_fluid"], "processes": ["volcanic_degassing_and_eruption", "magma_generation_and_ascent"], "spatial_scale": "fault_or_volcanic_edifice", "temporal_scale": "instantaneous_to_event", "depth_range": "0–25 km", "observables": [ "edifice tilt/InSAR deformation, volcano-tectonic seismicity, and UV/FTIR SO2/CO2 gas plume ratios", "melt-inclusion volatile contents and crystal-cargo diffusion chronometry", ], "inferred": [ "crystal-mush remobilization timescales, conduit magma ascent rates, and effusive-to-explosive transitions", "volatile exsolution kinetics and overpressure thresholds triggering dike propagation", ], "forcings": "mafic magma recharge, volatile exsolution buoyancy, and conduit shear heating", "boundaries": "magma viscosity, conduit geometry, and edifice stress field", }, { "sub_id": "tsunami_seafloor_displacement", "keywords": r"\b(tsunami\w*|runup|inundation|meteotsunami|seafloor\s+deformation|ocean\s+bottom\s+pressure|dart\s+buoy|submarine\s+failure)\b", "components": ["seafloor", "coast"], "media": ["seawater", "marine_sediment"], "processes": ["fault_rupture_and_slip", "coastal_and_estuarine_morphodynamics"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "instantaneous_to_event", "depth_range": "0–10 km", "observables": [ "DART deep-ocean bottom pressure records, cabled seafloor observatories, and tide-gauge waveforms", "post-tsunami coastal runup surveys, boulder transport limits, and paleotsunami sand sheets", ], "inferred": [ "shallow trench-wedge splay-fault slip partitioning and tsunami-earthquake dispersive wave amplification", "nearshore bathymetric focusing and coastal bottom-friction dissipation during overland flow", ], "forcings": "coseismic seafloor vertical displacement and submarine mass-failure acceleration", "boundaries": "continental shelf bathymetry, coastal topography, and trench-wedge compliance", }, { "sub_id": "landslide_debris_flow_mass_wasting", "keywords": r"\b(landslide\w*|debris\s+flow|rockfall|rock\s+avalanche|slope\s+failure|slope\s+stability|mass\s+wasting|liquefaction|quick\s+clay|lahar|earthflow)\b", "components": ["regolith", "fault_zone"], "media": ["soil", "pore_water"], "processes": ["landslide_and_mass_wasting", "hydrological_partitioning_and_runoff"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "instantaneous_to_event", "depth_range": "0–200 m", "observables": [ "multi-temporal LiDAR/InSAR slope displacement fields, borehole inclinometers, and pore-pressure piezometers", "seismic acoustic emissions and flume/ring-shear basal friction measurements", ], "inferred": [ "transition from slow hillslope creep to catastrophic runaway acceleration via shear-zone liquefaction", "basal pore-pressure diffusion and grain-inertia entrainment rates during debris-flow runout", ], "forcings": "extreme rainfall infiltration, coseismic strong ground shaking, and rapid snowmelt", "boundaries": "regolith thickness, hillslope gradient, clay mineralogy, and bedrock fracture permeability", }, ], 3: [ { "sub_id": "low_temp_aqueous_clay_sorption_interface", "keywords": r"\b(adsorption|sorption|desorption|clay|montmorillonite|kaolinite|illite|smectite|ferrihydrite|goethite|hematite|calcite|colloid|aqueous|speciation|surface\s+complexation|interfacial|dissolution|cation|anion|radium|uranium|arsenic)\b", "components": ["critical_zone", "regolith"], "media": ["pore_water", "sediment"], "processes": ["chemical_weathering", "redox_transformation"], "spatial_scale": "molecular_to_pore", "temporal_scale": "instantaneous_to_event", "depth_range": "0–500 m", "observables": [ "synchrotron X-ray absorption spectroscopy (EXAFS/XANES) and in-situ vibrational spectroscopy", "sorption isotherms, diffusive gradients in thin films (DGT), and aqueous speciation titrations", ], "inferred": [ "inner- versus outer-sphere surface complexation thermodynamics and interfacial hydration energetics", "mineral-water dissolution/precipitation rate constants and competitive ion-exchange selectivity", ], "forcings": "pH/Eh gradients, ionic strength fluctuations, and organic ligand complexation", "boundaries": "mineral surface site density, interlayer basal spacing, and pore-throat geometry", }, { "sub_id": "igneous_petrology_magmatic_differentiation", "keywords": r"\b(magma\w*|melt|granite|granitic|basalt\w*|rhyolit\w+|adakit\w+|pegmatit\w+|silicic|mafic|ultramafic|peridotit\w+|kimberlit\w+|carbonatit\w+|petrogenesis|crystallization|partial\s+melting|pluton\w*|batholith)\b", "components": ["magma_reservoir", "continental_crust"], "media": ["magma_or_melt", "crystalline_rock"], "processes": ["magma_generation_and_ascent", "metamorphic_transformation"], "spatial_scale": "core_to_outcrop", "temporal_scale": "multi_million_year_tectonic", "depth_range": "5–150 km", "observables": [ "electron microprobe and LA-ICP-MS mineral/melt-inclusion major and trace element zoning", "piston-cylinder and multi-anvil phase-equilibrium experiments and radiogenic Sr-Nd-Hf isotopes", ], "inferred": [ "degree of partial melting, crustal assimilation vs. fractional crystallization (AFC) mass balance", "melt extraction percolation thresholds and volatile/chalcophile partitioning coefficients", ], "forcings": "decompression melting, mantle heat flux, and flux melting by slab-derived volatiles", "boundaries": "source rock fertility, oxygen fugacity (fO2), and pressure-temperature ascent path", }, { "sub_id": "hydrothermal_ore_deposits_metallogeny", "keywords": r"\b(ore|mineralization|deposit\w*|porphyry|epithermal|skarn|vms|orogenic\s+gold|metallogen\w*|hydrothermal|sulfide|chalcopyrite|pyrite|sphalerite|molybdenite|cassiterite|rare\s+earth|ree|lithium|cobalt|cu-au)\b", "components": ["hydrothermal_system", "continental_crust"], "media": ["hydrothermal_fluid", "crystalline_rock"], "processes": ["redox_transformation", "magma_generation_and_ascent"], "spatial_scale": "core_to_outcrop", "temporal_scale": "multi_million_year_tectonic", "depth_range": "1–15 km", "observables": [ "fluid-inclusion microthermometry, Raman spectroscopy, and LA-ICP-MS single-inclusion metal assays", "in-situ sulfur, oxygen, and copper/iron/zinc stable isotope zoning across ore paragenetic stages", ], "inferred": [ "metal-ligand complex stability, phase-separation brine/vapor partitioning, and precipitation triggers", "magmatic-hydrothermal fluid flux budgets and structural permeability focusing mechanisms", ], "forcings": "magmatic fluid exsolution, decompression boiling, and fluid-rock redox reactions", "boundaries": "host-rock buffering capacity, fault-fracture network connectivity, and salinity/fO2 gradients", }, { "sub_id": "isotope_geochemistry_geochronology", "keywords": r"\b(isotop\w+|delta|δ|fractionation|zircon|monazite|apatite|titanite|u-pb|lu-hf|sm-nd|rb-sr|re-os|ar-ar|geochron\w*|thermochron\w*|fission-track|u-th-he)\b", "components": ["continental_crust", "lithosphere"], "media": ["crystalline_rock", "rock"], "processes": ["metamorphic_transformation", "chemical_weathering"], "spatial_scale": "core_to_outcrop", "temporal_scale": "geological_deep_time", "depth_range": "0–100 km", "observables": [ "MC-ICP-MS, SIMS, and TIMS high-precision radiogenic and non-traditional stable isotope ratios", "ab-initio density-functional-theory (DFT) vibrational force constants and diffusion profiles", ], "inferred": [ "equilibrium versus kinetic mass-dependent and mass-independent isotope fractionation factors", "closure temperatures, radiation-damage annealing kinetics, and crustal residence timescales", ], "forcings": "thermal diffusion, metamorphic recrystallization, and redox phase partitioning", "boundaries": "crystal lattice defect density, cooling rate, and open- vs. closed-system fluid exchange", }, { "sub_id": "high_pressure_mineral_physics_metamorphism", "keywords": r"\b(metamorphic|metamorphism|eclogite|granulite|amphibolite|blueschist|serpentin\w+|diamond|elastic|high-pressure|equation\s+of\s+state|olivine|garnet|pyroxene|quartz|coesite|rheolog\w+)\b", "components": ["lithosphere", "upper_mantle"], "media": ["crystalline_rock", "mantle_silicate"], "processes": ["metamorphic_transformation", "crustal_deformation"], "spatial_scale": "core_to_outcrop", "temporal_scale": "multi_million_year_tectonic", "depth_range": "10–410 km", "observables": [ "diamond-anvil-cell synchrotron X-ray diffraction, Brillouin scattering, and EBSD fabric analyses", "pseudosection phase-equilibria thermobarometry and trace-element-in-mineral thermometers", ], "inferred": [ "pressure-temperature-time-deformation (P-T-t-d) paths and dislocation vs. diffusion creep laws", "mineral elastic moduli, seismic wave-velocity anisotropy, and dehydration embrittlement kinetics", ], "forcings": "tectonic burial/exhumation, deviatoric stress, and metamorphic fluid infiltration", "boundaries": "bulk rock composition, grain-size evolution, and water activity (aH2O)", }, ], 4: [ { "sub_id": "quaternary_orbital_ice_core_paleoclimate", "keywords": r"\b(pleistocene|holocene|quaternary|glacial|interglacial|deglaciation|younger\s+dryas|heinrich|dansgaard|milankovitch|orbital|speleothem|loess|ice\s+core|last\s+glacial\s+maximum|lgm|mid-pleistocene)\b", "components": ["sedimentary_stratigraphic_archive", "ice_sheet"], "media": ["ice_or_snow", "sedimentary_rock"], "processes": ["radiative_transfer_and_energy_balance", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "hemispheric", "temporal_scale": "millennial_to_orbital", "depth_range": "Surface to 4 km ice/sediment depth", "observables": [ "ice-core trapped-gas CO2/CH4 records, speleothem U-Th/delta-18O series, and loess-paleosol sequences", "marine benthic foraminiferal delta-18O/delta-13C stacks and alkenone/TEX86 sea-surface temperatures", ], "inferred": [ "orbital pacing of glacial-interglacial transitions (including the Mid-Pleistocene Transition)", "interhemispheric phasing of millennial abrupt climate oscillations and deep-ocean carbon storage", ], "forcings": "Milankovitch orbital insolation variations, ice-sheet albedo feedbacks, and AMOC reorganizations", "boundaries": "continental ice-sheet geometry, Southern Ocean sea-ice extent, and dust radiative forcing", }, { "sub_id": "greenhouse_hyperthermals_cenozoic_mesozoic", "keywords": r"\b(paleogene|eocene|petm|paleocene|oligocene|miocene|pliocene|cretaceous|jurassic|triassic|hyperthermal|greenhouse|oae|oceanic\s+anoxic|cenozoic|mesozoic)\b", "components": ["sedimentary_stratigraphic_archive", "marine_sediment"], "media": ["marine_sediment", "sedimentary_rock"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "radiative_transfer_and_energy_balance"], "spatial_scale": "planetary_global", "temporal_scale": "multi_million_year_tectonic", "depth_range": "0–3 km sediment cores", "observables": [ "IODP deep-sea core carbon-isotope excursions (CIEs), clumped-isotope (Delta47) paleothermometry, and boron-isotope pCO2", "cyclo- and magnetostratigraphic age models and osmium/strontium weathering-proxy records", ], "inferred": [ "Earth system sensitivity (ESS) under high-CO2 greenhouse states and carbon-release rates during hyperthermals", "silicate-weathering and organic-carbon burial negative feedback timescales following carbon-cycle perturbations", ], "forcings": "Large Igneous Province (LIP) volcanic degassing, methane hydrate dissociation, and gateway tectonics", "boundaries": "paleogeographic continental configuration, ocean gateway bathymetry, and carbonate compensation depth", }, { "sub_id": "precambrian_oxygenation_early_earth", "keywords": r"\b(archean|proterozoic|hadean|neoproterozoic|paleoproterozoic|ediacaran|cambrian|great\s+oxidation|goe|noe|snowball\s+earth|banded\s+iron|bif|euxinia|early\s+earth|precambrian)\b", "components": ["sedimentary_stratigraphic_archive", "atmosphere"], "media": ["sedimentary_rock", "marine_sediment"], "processes": ["redox_transformation", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "planetary_global", "temporal_scale": "billion_year_planetary", "depth_range": "0–10 km cratonic basins", "observables": [ "mass-independent sulfur isotopes (Delta33S), iron speciation, and Ce/Mo/U/Cr redox-sensitive trace-metal shales", "carbonate-associated sulfate and detrital redox-sensitive mineral assemblages", ], "inferred": [ "stepwise oxygenation of Earth's atmosphere and deep oceans across the GOE and NOE", "links between supercontinent cycles, nutrient phosphorus availability, and early biospheric evolution", ], "forcings": "oxygenic photosynthesis evolution, mantle reducer outgassing decline, and Snowball Earth glaciations", "boundaries": "continental emergence area, marine sulfate inventory, and hydrothermal iron fluxes", }, { "sub_id": "mass_extinction_paleoecology_turnover", "keywords": r"\b(extinction|permian-triassic|end-permian|end-cretaceous|k-pg|ordovician|devonian|triassic-jurassic|biotic\s+crisis|fossil|taphonom\w+|biostratigraph\w+|ammonit\w+|conodont\w+|brachiopod\w+|trilobit\w+)\b", "components": ["sedimentary_stratigraphic_archive", "biosphere"], "media": ["sedimentary_rock", "marine_sediment"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "redox_transformation"], "spatial_scale": "planetary_global", "temporal_scale": "geological_deep_time", "depth_range": "0–5 km stratigraphic sections", "observables": [ "high-precision CA-ID-TIMS U-Pb ash-bed chronology,mercury anomalies (Hg/TOC), and sulfur/nitrogen isotopes", "paleobiological taxonomic/functional diversity curves and carbonate platform demise horizons", ], "inferred": [ "kill mechanisms (anoxia, hypercapnia, ocean acidification, thermal shock) and biotic recovery timescales", "preservation and sampling biases versus true ecological collapse across mass-extinction boundaries", ], "forcings": "trap volcanism (Siberian, Deccan, CAMP), bolide impact, and marine photic-zone euxinia", "boundaries": "shelf habitat area, trophic network redundancy, and post-crisis nutrient recycling", }, { "sub_id": "basin_stratigraphy_provenance_diagenesis", "keywords": r"\b(stratigraph\w+|sedimentary\s+basin|provenance|detrital\s+zircon|diagenes\w+|dolomit\w+|sequence\s+stratigraph\w+|turbidit\w+|facies|foreland\s+basin|unconformity|chemostratigraph\w+)\b", "components": ["sedimentary_basin", "continental_sediment"], "media": ["sedimentary_rock", "pore_water"], "processes": ["sediment_transport_and_deposition", "chemical_weathering"], "spatial_scale": "sedimentary_basin_or_continental_margin", "temporal_scale": "multi_million_year_tectonic", "depth_range": "0–12 km", "observables": [ "seismic-stratigraphic clinoform geometries, borehole wireline logs, and detrital zircon U-Pb age spectra", "petrographic cement paragenesis, clumped-isotope burial temperatures, and mudrock biomarker maturity", ], "inferred": [ "relative contributions of eustasy, tectonic subsidence, and sediment supply to stratigraphic architecture", "post-depositional diagenetic overprinting of primary paleoenvironmental proxy signals", ], "forcings": "tectonic flexural subsidence, eustatic sea-level oscillations, and hinterland denudation pulses", "boundaries": "basin accommodation space, pore-fluid chemistry, and burial thermal gradient", }, ], 5: [ { "sub_id": "fluvial_channel_sediment_transport", "keywords": r"\b(river|fluvial|channel|bedload|suspended\s+sediment|meander\w*|braided|alluvial|avulsion|floodplain|knickpoint|incision|bank\s+erosion|stream\s+power|turbidity\s+current)\b", "components": ["river", "floodplain"], "media": ["fluvial_or_coastal_sediment", "freshwater_surface"], "processes": ["sediment_transport_and_deposition", "physical_erosion_and_denudation"], "spatial_scale": "reach", "temporal_scale": "interannual_to_decadal", "depth_range": "0–50 m", "observables": [ "acoustic Doppler bedload/suspended-flux profiles, repeat airborne LiDAR/bathymetric DEMs, and grain-size distributions", "in-situ cosmogenic nuclide (10Be/26Al) catchment erosion rates and fallout radionuclide (137Cs/210Pb) budgets", ], "inferred": [ "nonlinear bedload transport thresholds, channel-width adjustment laws, and avulsion return periods", "sediment residence times and storage-release hysteresis across hillslope-to-floodplain cascades", ], "forcings": "flood hydrograph flashiness, tectonic base-level fall, and upstream sediment supply pulses", "boundaries": "bed grain-size armoring, riparian bank cohesion, and valley confinement", }, { "sub_id": "tectonic_geomorphology_orogenic_erosion", "keywords": r"\b(denudation|exhumation|orogenic\s+relief|topographic|drainage\s+divide|river\s+capture|landscape\s+evolution|uplift|cosmogenic|10be|thermochron\w*|gorge|bedrock\s+river)\b", "components": ["orogen", "river"], "media": ["crystalline_rock", "fluvial_or_coastal_sediment"], "processes": ["physical_erosion_and_denudation", "crustal_deformation"], "spatial_scale": "tectonic_plate_or_orogen", "temporal_scale": "millennial_to_orbital", "depth_range": "0–5 km relief", "observables": [ "catchment-wide cosmogenic 10Be denudation rates, low-temperature apatite (U-Th)/He ages, and channel steepness (ksn)", "high-resolution digital elevation models (DEMs) and chi-analysis of drainage divide migration", ], "inferred": [ "coupling and lag timescales between rock uplift, precipitation gradients, and bedrock incision", "transient landscape response to drainage reorganization and glacial-fluvial erosion switching", ], "forcings": "tectonic rock uplift, orographic precipitation focus, and Quaternary glaciation cycles", "boundaries": "bedrock lithological erodibility, fracture spacing, and threshold hillslope angles", }, { "sub_id": "aeolian_dunes_dust_loess_geomorphology", "keywords": r"\b(aeolian|eolian|dune\w*|sand\s+sea|erg|barchan|saltation|dust\s+emission|wind\s+erosion|ventifact|yardang|desert\s+pavement)\b", "components": ["dryland", "continental_sediment"], "media": ["fluvial_or_coastal_sediment", "tropospheric_air"], "processes": ["sediment_transport_and_deposition", "physical_erosion_and_denudation"], "spatial_scale": "landscape", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–100 m", "observables": [ "high-frequency anemometer/piezoelectric saltation flux arrays and multi-temporal UAV/satellite dune tracking", "optically stimulated luminescence (OSL) dune stratigraphy and dust-source grain-size/mineralogy signatures", ], "inferred": [ "aerodynamic entrainment thresholds under turbulent gustiness and soil-moisture/crusting cohesion", "self-organization of complex dune-field defect patterns under multidirectional wind regimes", ], "forcings": "boundary-layer wind shear stress, synoptic dust storms, and aridity oscillations", "boundaries": "sediment availability, biological soil crust cover, and upwind topographic roughness", }, { "sub_id": "karst_cave_glacial_periglacial_geomorphology", "keywords": r"\b(karst|sinkhole|dissolution|epikarst|drumlin|moraine|esker|subglacial|periglacial|solifluction|rock\s+glacier|patterned\s+ground|frost\s+cracking)\b", "components": ["regolith", "glacier"], "media": ["sedimentary_rock", "ice_or_snow"], "processes": ["physical_erosion_and_denudation", "chemical_weathering"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "centennial_to_millennial", "depth_range": "0–500 m", "observables": [ "terrestrial laser scanning (TLS), ground-penetrating radar (GPR), and dye-tracing/hydrochemical breakthrough curves", "cosmogenic exposure dating of moraine boulders and frost-cracking acoustic emission logs", ], "inferred": [ "subglacial till deformation vs. bedrock quarrying laws and karst conduit-network enlargement rates", "periglacial frost-cracking intensity and sediment production sensitivity to diurnal/seasonal freeze-thaw", ], "forcings": "basal glacier sliding velocity, freeze-thaw thermal cycling, and carbonic-acid infiltration", "boundaries": "carbonate bedding/fracture porosity, basal water pressure, and regolith thermal diffusivity", }, { "sub_id": "hillslope_soil_erosion_gully_badlands", "keywords": r"\b(hillslope|soil\s+erosion|rill|gully|sheet\s+erosion|raindrop|splash|bioturbation|soil\s+creep|colluvium|sediment\s+yield|connectivity|check\s+dam|terrace)\b", "components": ["regolith", "soil"], "media": ["soil", "fluvial_or_coastal_sediment"], "processes": ["physical_erosion_and_denudation", "sediment_transport_and_deposition"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "instantaneous_to_event", "depth_range": "0–20 m", "observables": [ "plot-to-catchment runoff/sediment-flux weirs, repeat structure-from-motion (SfM) photogrammetry, and sediment fingerprinting", "137Cs, excess 210Pb, and fallout Pu soil redistribution profiles", ], "inferred": [ "nonlinearhillslope diffusive-to-advective transition thresholds and structural vs. functional sediment connectivity", "biogenic soil-production and bioturbation transport coefficients across climate and vegetation gradients", ], "forcings": "convective storm kinetic energy, overland flow shear stress, and land-use disturbance", "boundaries": "soil aggregate stability, root density, surface microtopography, and slope curvature", }, ], 6: [ { "sub_id": "cloud_microphysics_aerosol_ccn_in", "keywords": r"\b(cloud\w*|microphysic\w*|aerosol-cloud|droplet|ice\s+nucleat\w*|inp|ccn|supercooled|autoconversion|entrainment|mixed-phase|cirrus|stratocumulus|cumulus)\b", "components": ["troposphere", "boundary_layer"], "media": ["aerosol_or_cloud_hydrometeor", "cloud_water"], "processes": ["cloud_microphysics_and_aerosol_interaction", "radiative_transfer_and_energy_balance"], "spatial_scale": "regional_synoptic", "temporal_scale": "diurnal_to_synoptic", "depth_range": "0–18 km altitude", "observables": [ "aircraft in-situ cloud-droplet/ice-crystal optical array probes and dual-polarization Doppler cloud radar/lidar", "continuous-flow diffusion chamber ice-nucleating particle (INP) spectra and CCN supersaturation counters", ], "inferred": [ "secondary ice production (SIP) multiplication rates and supercooled liquid-to-ice phase partitioning", "aerosol-cloud effective radiative forcing (ERFaci) and cloud-top entrainment drying feedbacks", ], "forcings": "updraft supersaturation fluctuations, radiative cloud-top cooling, and aerosol loading perturbations", "boundaries": "lower-tropospheric stability, boundary-layer inversion strength, and aerosol chemical hygroscopicity", }, { "sub_id": "tropospheric_chemistry_soa_ozone_radicals", "keywords": r"\b(secondary\s+organic\s+aerosol|soa|ozone|o3|nox|voc\w*|isoprene|terpene|hydroxyl|oh\s+radical|nitrate\s+radical|photochem\w*|new\s+particle\s+formation|nucleation|brown\s+carbon|black\s+carbon|pm2\.5)\b", "components": ["troposphere", "boundary_layer"], "media": ["tropospheric_air", "aerosol_or_cloud_hydrometeor"], "processes": ["cloud_microphysics_and_aerosol_interaction", "contaminant_transport_and_fate"], "spatial_scale": "regional_synoptic", "temporal_scale": "diurnal_to_synoptic", "depth_range": "0–12 km altitude", "observables": [ "high-resolution TOF-CIMS and aerosol mass spectrometry (AMS) molecular speciation and radical laser-induced fluorescence", "smog-chamber oxidation yields and satellite (TROPOMI/TEMPO) tropospheric NO2/HCHO/O3 column retrievals", ], "inferred": [ "autoxidation and multiphase aqueous/heterogeneous reaction pathways governing SOA volatility and mass yields", "nonlinear ozone production sensitivity (NOx- vs. VOC-limited regimes) and nocturnal radical recycling", ], "forcings": "actinic solar UV flux, biogenic VOC emissions, and anthropogenic/wildfire precursor plumes", "boundaries": "boundary-layer mixing height, relative humidity, and pre-existing aerosol surface area", }, { "sub_id": "convective_storms_tropical_cyclones_monsoon", "keywords": r"\b(tropical\s+cyclone|hurricane|typhoon|convecti\w+|thunderstorm|mesoscale\s+convective|mcs|squall|tornado|lightning|hail|rapid\s+intensification|eyewall|monsoon\s+rainfall|orographic\s+precipitation)\b", "components": ["troposphere", "boundary_layer"], "media": ["tropospheric_air", "precipitation"], "processes": ["atmospheric_convection_and_circulation", "cloud_microphysics_and_aerosol_interaction"], "spatial_scale": "regional_synoptic", "temporal_scale": "diurnal_to_synoptic", "depth_range": "0–20 km altitude", "observables": [ "phased-array and dual-polarization weather radar, dropsonde wind/thermodynamic profiles, and geostationary IR/lightning imagers", "cloud-resolving (km-scale) ensemble hindcasts and airborne Doppler radar vorticity retrievals", ], "inferred": [ "convective cold-pool organization, upscale vorticity aggregation, and tropical-cyclone rapid intensification triggers", "stochastic boundary-layer trigger mechanisms for deep moist convection initiation over complex terrain", ], "forcings": "convective available potential energy (CAPE), sea-surface enthalpy fluxes, and vertical wind shear", "boundaries": "mid-tropospheric dry-air entrainment, orographic barrier geometry, and land-surface soil-moisture heterogeneity", }, { "sub_id": "stratosphere_mesosphere_gravity_waves_ozone", "keywords": r"\b(stratospher\w+|mesospher\w+|thermospher\w+|ionospher\w+|gravity\s+wave\w*|planetary\s+wave|sudden\s+stratospheric\s+warming|ssw|quasi-biennial|qbo|brewer-dobson|polar\s+vortex|tropopause|utlls)\b", "components": ["stratosphere", "mesosphere"], "media": ["stratospheric_or_upper_air", "air"], "processes": ["atmospheric_convection_and_circulation", "radiative_transfer_and_energy_balance"], "spatial_scale": "hemispheric", "temporal_scale": "synoptic_to_seasonal", "depth_range": "10–100 km altitude", "observables": [ "GPS radio occultation temperature profiles, limb-sounding satellite trace-gas retrievals (MLS/SABER), and Rayleigh lidar", "superpressure balloon momentum-flux measurements and high-altitude research aircraft UTLS transects", ], "inferred": [ "sub-grid non-orographic gravity-wave momentum deposition and wave-mean-flow interaction during SSW events", "two-way stratosphere-troposphere mass exchange across the upper troposphere/lower stratosphere (UTLS)", ], "forcings": "upward-propagating Rossby and gravity wave packets, solar UV variability, and stratospheric aerosol injection", "boundaries": "tropopause sharp thermal inversion, QBO phase, and polar night jet shear", }, { "sub_id": "boundary_layer_turbulence_air_surface_exchange", "keywords": r"\b(boundary\s+layer|pbl|abl|turbulen\w*|eddy\s+covariance|monin-obukhov|surface\s+layer|nocturnal\s+jet|low-level\s+jet|entrainment\s+zone|inversion|roughness\s+sublayer)\b", "components": ["boundary_layer", "troposphere"], "media": ["tropospheric_air", "air"], "processes": ["atmospheric_convection_and_circulation", "radiative_transfer_and_energy_balance"], "spatial_scale": "local_landscape_or_urban", "temporal_scale": "diurnal_to_synoptic", "depth_range": "0–3 km altitude", "observables": [ "sonic anemometer eddy-covariance towers, Doppler wind lidar profiles, and tethered balloon turbulence probes", "large-eddy simulation (LES) benchmark fields and scintillometer area-averaged sensible heat fluxes", ], "inferred": [ "breakdown of Monin-Obukhov similarity theory over heterogeneous terrain and stable nocturnal boundary layers", "intermittent turbulence bursting and nonlocal counter-gradient transport across the entrainment zone", ], "forcings": "diurnal surface radiative heating/cooling and synoptic geostrophic pressure gradients", "boundaries": "canopy/topographic aerodynamic roughness, soil thermal inertia, and capping inversion strength", }, ], 7: [ { "sub_id": "climate_sensitivity_cloud_radiative_feedbacks", "keywords": r"\b(climate\s+sensitivity|ecs|tcr|cloud\s+feedback|radiative\s+feedback|radiative\s+forcing|pattern\s+effect|lapse-rate\s+feedback|water-vapor\s+feedback|albedo\s+feedback|cmip6|emergent\s+constraint)\b", "components": ["atmosphere", "ocean"], "media": ["tropospheric_air", "aerosol_or_cloud_hydrometeor"], "processes": ["radiative_transfer_and_energy_balance", "cloud_microphysics_and_aerosol_interaction"], "spatial_scale": "planetary_global", "temporal_scale": "multidecadal", "depth_range": "Surface to top of atmosphere (TOA)", "observables": [ "CERES/ERBE top-of-atmosphere radiative energy budget time series and Argo global ocean heat uptake", "A-Train active cloud radar/lidar radiative kernel decompositions and CMIP6 multi-model ensembles", ], "inferred": [ "equilibrium climate sensitivity (ECS) bounds and sea-surface warming pattern effects on low-cloud feedbacks", "state dependence of tropical anvil-cloud area and extratropical mixed-phase optical-depth feedbacks", ], "forcings": "anthropogenic greenhouse-gas radiative forcing and spatially heterogeneous aerosol forcing", "boundaries": "tropical Pacific east-west SST gradient, Southern Ocean heat uptake efficiency, and cloud microphysical state", }, { "sub_id": "enso_pdo_amo_modes_teleconnections", "keywords": r"\b(enso|el\s+nino|la\s+nina|southern\s+oscillation|indian\s+ocean\s+dipole|iod|madden-julian|mjo|nao|north\s+atlantic\s+oscillation|pdo|pacific\s+decadal|amo|amv|teleconnection|walker\s+circulation|hadley\s+cell)\b", "components": ["ocean", "troposphere"], "media": ["seawater", "tropospheric_air"], "processes": ["atmospheric_convection_and_circulation", "ocean_circulation_and_mixing"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "interannual_to_decadal", "depth_range": "Ocean thermocline to upper troposphere", "observables": [ "TAO/TRITON/RAMA equatorial mooring arrays, satellite altimetry/SST, and global atmospheric reanalysis products", "coupled seasonal-to-decadal initialized hindcast ensembles and coral/tree-ring paleoclimate reconstructions", ], "inferred": [ "ENSO flavor diversity (Eastern vs. Central Pacific), phase-locking, and pantropical basin-interaction predictability", "relative roles of internal ocean-atmosphere coupling versus external forcing in multidecadal (PDV/AMV) variability", ], "forcings": "westerly wind bursts, equatorial thermocline Kelvin/Rossby wave propagation, and diabatic convective heating", "boundaries": "equatorial thermocline depth/sharpness, Indo-Pacific warm-pool geometry, and midlatitude jet waveguide state", }, { "sub_id": "extreme_events_heatwaves_blocking_compound", "keywords": r"\b(heatwave\w*|cold\s+wave|extreme\s+precipitation|atmospheric\s+river|blocking|jet\s+stream|rossby\s+wave|compound\s+event|compound\s+extreme|attribution|flash\s+drought|drought\w*|wildfire\s+weather)\b", "components": ["troposphere", "biosphere_terrestrial"], "media": ["tropospheric_air", "soil"], "processes": ["atmospheric_convection_and_circulation", "radiative_transfer_and_energy_balance"], "spatial_scale": "continental", "temporal_scale": "synoptic_to_seasonal", "depth_range": "Root zone to tropopause", "observables": [ "daily station/gridded extreme temperature and precipitation indices, upper-air geopotential blocking diagnostics", "large initial-condition single-model ensembles (SMILEs) and storyline event-attribution simulations", ], "inferred": [ "thermodynamic Clausius-Clapeyron scaling versus dynamic circulation/blocking changes in extreme events", "land-atmosphere soil-moisture dessication feedbacks amplifying compound hot-dry and humid-heat extremes", ], "forcings": "quasi-stationary Rossby wave amplification, atmospheric blocking persistence, and soil-moisture depletion", "boundaries": "arctic-to-midlatitude thermal gradient, soil water-holding capacity, and antecedent snowpack/SST anomalies", }, { "sub_id": "global_carbon_climate_tipping_feedbacks", "keywords": r"\b(tipping\s+point|tipping\s+element|bistability|hysteresis|abrupt\s+change|carbon-climate\s+feedback|transient\s+climate\s+response\s+to\s+cumulative|tcre|zero\s+emissions\s+commitment|zec|methane\s+feedback|earth\s+system\s+model)\b", "components": ["atmosphere", "biosphere"], "media": ["tropospheric_air", "biota"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "radiative_transfer_and_energy_balance"], "spatial_scale": "planetary_global", "temporal_scale": "centennial_to_millennial", "depth_range": "Coupled atmosphere-ocean-land biosphere", "observables": [ "global atmospheric CO2/CH4/N2O flask networks, satellite column XCO2/XCH4 (OCO-2/GOSAT), and ocean pCO2", "coupled C4MIP Earth System Model simulations and paleoclimate abrupt-transition records", ], "inferred": [ "critical warming thresholds and cascading interactions among Earth-system tipping elements", "magnitude and sign of carbon-concentration (beta) vs. carbon-climate (gamma) feedbacks under overshoot pathways", ], "forcings": "cumulative anthropogenic carbon emissions and high-latitude/tropical warming amplification", "boundaries": "ocean carbonate buffering capacity, terrestrial nutrient stoichiometry, and permafrost carbon stocks", }, { "sub_id": "monsoon_hydroclimate_itcz_shifts", "keywords": r"\b(monsoon|itcz|intertropical\s+convergence|sahel|south\s+asian\s+monsoon|east\s+asian\s+monsoon|west\s+african\s+monsoon|aridification|hydroclimat\w+|precipitation\s+minus\s+evaporation|p-e)\b", "components": ["troposphere", "ocean"], "media": ["tropospheric_air", "precipitation"], "processes": ["atmospheric_convection_and_circulation", "hydrological_partitioning_and_runoff"], "spatial_scale": "continental", "temporal_scale": "interannual_to_decadal", "depth_range": "Surface to tropopause", "observables": [ "TRMM/GPM satellite precipitation radar, water-vapor isotopologues, and atmospheric moisture-budget reanalyses", "monsoon onset/withdrawal indices and cross-equatorial atmospheric energy-transport diagnostics", ], "inferred": [ "energetic controls on ITCZ latitudinal migrations and regional monsoon rainfall vs. circulation decoupling", "aerosol direct/indirect cooling versus greenhouse warming impacts on Asian and African monsoon intensity", ], "forcings": "interhemispheric radiative heating asymmetries, land-sea thermal contrast, and Tibetan Plateau sensible heating", "boundaries": "orographic barrier geometry, Indian/Pacific SST gradients, and regional aerosol optical depth", }, ], 8: [ { "sub_id": "ice_sheet_grounding_line_marine_instability", "keywords": r"\b(ice\s+sheet|ice\s+shelf|grounding\s+line|marine\s+ice\s+sheet|misi|micl|antarctic\s+ice|greenland\s+ice|thwaites|pine\s+island|calving|buttressing|ice\s+stream|basal\s+sliding|subglacial\s+hydrology)\b", "components": ["ice_sheet", "ice_shelf"], "media": ["ice_or_snow", "seawater"], "processes": ["cryospheric_melt_and_ice_flow", "ocean_circulation_and_mixing"], "spatial_scale": "continental", "temporal_scale": "centennial_to_millennial", "depth_range": "0–4 km ice thickness", "observables": [ "ICESat-2/CryoSat-2 laser/radar altimetry, Sentinel-1 InSAR ice-velocity fields, and airborne ice-penetrating radar", "autonomous underwater vehicle (AUV) sub-ice-shelf cavity hydrography and borehole basal water pressures", ], "inferred": [ "basal friction constitutive laws (Weertman vs. Coulomb plastic) and sub-ice-shelf basal melt parameterization", "irreversible grounding-line retreat thresholds under Marine Ice Sheet and Ice Cliff Instability (MISI/MICI)", ], "forcings": "Circumpolar Deep Water (CDW) intrusion into ice-shelf cavities and surface meltwater hydrofracturing", "boundaries": "retrograde subglacial bed topography, basal till rheology, and ice-shelf pinning points", }, { "sub_id": "mountain_glaciers_mass_balance_debris", "keywords": r"\b(glacier\w*|mountain\s+glacier|debris-covered\s+glacier|glacier\s+surge|surging\s+glacier|equilibrium\s+line|ela|glacier\s+mass\s+balance|glacial\s+lake|glof|high\s+mountain\s+asia)\b", "components": ["glacier", "snowpack"], "media": ["ice_or_snow", "freshwater_surface"], "processes": ["cryospheric_melt_and_ice_flow", "hydrological_partitioning_and_runoff"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "interannual_to_decadal", "depth_range": "0–500 m ice thickness", "observables": [ "geodetic DEM differencing (ASTER/Pléiades), glaciological ablation-stake networks, and UAV thermal imagery", "proglacial discharge hydrographs and ground-penetrating radar ice-thickness profiles", ], "inferred": [ "supraglacial debris-thickness insulation vs. ice-cliff/pond melt enhancement on debris-covered glaciers", "enthalpy-driven thermal/hydrological switches governing periodic glacier surging instabilities", ], "forcings": "shortwave/longwave surface energy balance, solid-to-liquid precipitation shifts, and black-carbon deposition", "boundaries": "hypsometric elevation distribution, supraglacial debris lithology, and subglacial drainage efficiency", }, { "sub_id": "sea_ice_dynamics_thermodynamics_leads", "keywords": r"\b(sea\s+ice|pack\s+ice|fast\s+ice|polynya|lead\w*|melt\s+pond|marginal\s+ice\s+zone|miz|arctic\s+sea\s+ice|antarctic\s+sea\s+ice|ice-albedo|brine\s+rejection)\b", "components": ["sea_ice", "sea_surface"], "media": ["ice_or_snow", "seawater"], "processes": ["cryospheric_melt_and_ice_flow", "radiative_transfer_and_energy_balance"], "spatial_scale": "hemispheric", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–10 m ice thickness", "observables": [ "passive microwave sea-ice concentration, ICESat-2/CryoSat-2 freeboard thickness, and drifting buoy kinematics", "MOSAiC/shipboard ice-mass-balance buoys, melt-pond spectral albedo, and under-ice turbulent heat fluxes", ], "inferred": [ "viscous-plastic vs. elasto-brittle sea-ice rheology across multi-scale lead and ridge networks", "ocean-wave fracture attenuation in the marginal ice zone and seasonal-to-interannual sea-ice predictability", ], "forcings": "synoptic wind stress, oceanic mixed-layer heat flux, and surface downwelling longwave radiation", "boundaries": "snow-on-sea-ice depth, halocline stratification, and melt-pond drainage porosity", }, { "sub_id": "permafrost_thermokarst_active_layer_carbon", "keywords": r"\b(permafrost|thermokarst|active\s+layer|yedoma|talik|frozen\s+ground|ice\s+wedge|palsa|peat\s+plateau|permafrost\s+carbon|subsea\s+permafrost)\b", "components": ["permafrost", "soil"], "media": ["permafrost_or_frozen_ground", "soil"], "processes": ["cryospheric_melt_and_ice_flow", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "regional", "temporal_scale": "interannual_to_decadal", "depth_range": "0–500 m depth", "observables": [ "GTN-P borehole temperature arrays, electrical resistivity tomography (ERT), and active-layer probing", "eddy-covariance/chamber CO2 and CH4 fluxes and radiocarbon (Delta14C) age of respired/dissolved carbon", ], "inferred": [ "abrupt thermokarst collapse rates versus gradual top-down active-layer deepening", "partitioning of thawed permafrost carbon between aerobic CO2 respiration, methanogenesis, and lateral aquatic export", ], "forcings": "polar temperature amplification, winter snow-insulation changes, and boreal wildfire disturbance", "boundaries": "ground excess-ice content, yedoma silt vs. peat stratigraphy, and local drainage topography", }, { "sub_id": "snowpack_hydrology_sea_level_gia", "keywords": r"\b(snowpack|snow\s+water\s+equivalent|swe|snow\s+albedo|snowmelt|rain-on-snow|sea-level\s+rise|sea\s+level|barystatic|steric|glacial\s+isostatic|gia|fingerprinting)\b", "components": ["snowpack", "coast"], "media": ["ice_or_snow", "seawater"], "processes": ["cryospheric_melt_and_ice_flow", "hydrological_partitioning_and_runoff"], "spatial_scale": "continental", "temporal_scale": "interannual_to_decadal", "depth_range": "Surface snowpack to upper mantle GIA", "observables": [ "airborne Lidar/radar snow-depth surveys, SNOTEL pillow networks, and GRACE/GRACE-FO gravimetry", "satellite radar altimetry, tide-gauge networks, and GNSS vertical land motion (GIA) velocities", ], "inferred": [ "closure of regional sea-level budgets (barystatic mass addition, thermosteric expansion, and GIA fingerprints)", "canopy-snow interception sublimation and rain-on-snow runoff generation physics in mountain snowpacks", ], "forcings": "warming freezing levels, light-absorbing impurities on snow, and ice-mass redistribution", "boundaries": "3D upper-mantle viscosity structure (for GIA), forest canopy architecture, and coastal shelf geometry", }, ], 9: [ { "sub_id": "amoc_overturning_deep_water_formation", "keywords": r"\b(amoc|meridional\s+overturning|thermohaline|deep\s+water\s+formation|nadw|aabw|labrador\s+sea|nordic\s+seas|southern\s+ocean\s+overturning|abyssal\s+circulation|dense\s+shelf\s+water|convection\s+in\s+the\s+ocean)\b", "components": ["deep_ocean", "open_ocean"], "media": ["seawater", "ice_or_snow"], "processes": ["ocean_circulation_and_mixing", "cryospheric_melt_and_ice_flow"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "multidecadal", "depth_range": "0–6,000 m", "observables": [ "RAPID (26.5°N) and OSNAP trans-basin mooring arrays, Deep-Argo floats, and GO-SHIP repeat hydrography", "chlorofluorocarbon (CFC)/SF6 ventilation tracers and paleoceanographic Pa/Th and neodymium isotope records", ], "inferred": [ "relative roles of subpolar eastern vs. western North Atlantic buoyancy forcing in driving AMOC variability", "freshwater hosing stability thresholds and Southern Ocean wind/eddy compensation of overturning", ], "forcings": "high-latitude air-sea heat/freshwater fluxes, Greenland/Antarctic meltwater input, and Southern Hemisphere westerlies", "boundaries": "Greenland-Scotland Ridge sill bathymetry, Drake Passage geometry, and abyssal stratification", }, { "sub_id": "mesoscale_submesoscale_eddies_fronts", "keywords": r"\b(mesoscale|submesoscale|eddy|eddies|frontogenesis|baroclinic\s+instability|symmetric\s+instability|aguhlas|kuroshio|gulf\s+stream|western\s+boundary\s+current|gyre|rossby\s+wave\w*|vorticity)\b", "components": ["open_ocean", "sea_surface"], "media": ["seawater", "dissolved_phase"], "processes": ["ocean_circulation_and_mixing", "radiative_transfer_and_energy_balance"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–2,000 m", "observables": [ "SWOT wide-swath interferometer sea-surface height, surface drifter dispersion arrays, and glider high-resolution sections", "shipboard ADCP velocity shear profiles and eddy-resolving (1/12° to 1/48°) ocean general circulation models", ], "inferred": [ "forward versus inverse kinetic-energy cascades between balanced mesoscale eddies and ageostrophic submesoscale fronts", "scale-aware eddy diffusivity/backscatter parameterizations and western-boundary-current separation mechanics", ], "forcings": "wind-stress curl, surface buoyancy loss, and lateral density gradients across ocean fronts", "boundaries": "continental slope topography, Rossby deformation radius, and bottom boundary drag", }, { "sub_id": "internal_waves_tides_diapycnal_mixing", "keywords": r"\b(internal\s+wave\w*|internal\s+tide\w*|diapycnal\s+mixing|turbulent\s+mixing|microstructure|near-inertial|lee\s+wave\w*|double\s+diffusion|salt\s+finger\w*|barotropic\s+tide|abyssal\s+mixing)\b", "components": ["deep_ocean", "seafloor"], "media": ["seawater", "marine_sediment"], "processes": ["ocean_circulation_and_mixing", "sediment_transport_and_deposition"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "diurnal_to_synoptic", "depth_range": "100–6,000 m", "observables": [ "Vertical Microstructure Profiler (VMP) turbulent kinetic energy dissipation (epsilon) and finescale strain profiles", "deliberate SF6 tracer-release dispersion experiments and satellite altimetric internal-tide phase-locked signals", ], "inferred": [ "spatial geography of internal-tide and lee-wave breaking over rough abyssal bathymetry", "mixing efficiency (flux Richardson number Gamma) variations sustaining the global abyssal stratification", ], "forcings": "barotropic tidal flow over seamounts/ridges and synoptic wind-forced near-inertial oscillations", "boundaries": "seafloor abyssal-hill roughness spectrum, buoyancy frequency (N2), and Coriolis parameter", }, { "sub_id": "upper_ocean_mixed_layer_marine_heatwaves", "keywords": r"\b(marine\s+heatwave\w*|mhw|mixed\s+layer|thermocline|pycnocline|barrier\s+layer|air-sea|sea\s+surface\s+temperature|sst|sea\s+surface\s+salinity|sss|upwelling|ekman|langmuir)\b", "components": ["sea_surface", "open_ocean"], "media": ["seawater", "tropospheric_air"], "processes": ["ocean_circulation_and_mixing", "radiative_transfer_and_energy_balance"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–500 m", "observables": [ "Core-Argo temperature/salinity profiles, microwave/IR satellite SST & SSS (SMAP/SMOS), and surface flux moorings", "wave-glider air-sea momentum/heat transfer measurements and upper-ocean heat-budget closures", ], "inferred": [ "surface heat-flux forcing versus subsurface horizontal advection and entrainment in subsurface marine heatwaves", "Langmuir turbulence, freshwater barrier-layer subduction, and thermocline re-emergence timescales", ], "forcings": "surface net radiative/turbulent heat fluxes, Ekman pumping/upwelling winds, and surface wave breaking", "boundaries": "mixed-layer depth, halocline barrier-layer thickness, and coastal upwelling shelf geometry", }, { "sub_id": "coastal_shelf_marginal_sea_circulation", "keywords": r"\b(continental\s+shelf|shelf\s+sea|marginal\s+sea|south\s+china\s+sea|mediterranean|red\s+sea|baltic|black\s+sea|kuroshio\s+intrusion|strait|canyon|river\s+plume|cross-shelf)\b", "components": ["continental_shelf", "open_ocean"], "media": ["seawater", "fluvial_or_coastal_sediment"], "processes": ["ocean_circulation_and_mixing", "coastal_and_estuarine_morphodynamics"], "spatial_scale": "sedimentary_basin_or_continental_margin", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–1,000 m", "observables": [ "high-frequency (HF) coastal radar surface currents, bottom-mounted ADCP moorings, and coastal glider transects", "satellite ocean-color/SST front imagery and unstructured-grid coastal ocean model hindcasts", ], "inferred": [ "cross-shelf break exchange of heat, salt, and nutrients via submarine canyons and boundary-current intrusions", "buoyant river-plume bulge instability and tidal-straining stratification cycles in shelf seas", ], "forcings": "along-shelf upwelling/downwelling winds, barotropic spring-neap tides, and buoyant river discharge", "boundaries": "shelf-break canyon incision, strait sill constriction, and bottom boundary-layer roughness", }, ], 10: [ { "sub_id": "biological_carbon_pump_export_phytoplankton", "keywords": r"\b(biological\s+pump|biological\s+carbon\s+pump|particulate\s+organic\s+carbon|poc|marine\s+snow|fecal\s+pellet|phytoplankton|diatom\w*|coccolithophor\w*|cyanobacteria|diazotroph\w*|nitrogen\s+fixation|primary\s+production|export\s+production|mesopelagic|twilight\s+zone|diel\s+vertical\s+migration)\b", "components": ["open_ocean", "marine_ecosystem"], "media": ["seawater", "biota"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "ocean_circulation_and_mixing"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–1,000 m (epipelagic to mesopelagic)", "observables": [ "BGC-Argo bio-optical/nitrate/oxygen floats, neutrally buoyant sediment traps, and Underwater Vision Profilers (UVP)", "234Th/238U disequilibrium export fluxes and satellite hyperspectral ocean-color phytoplankton functional types", ], "inferred": [ "partitioning of carbon export between gravitational sinking, eddy subduction, and active migrantzooplankton transport", "microbial remineralization vs. mineral-ballast protection controlling twilight-zone transfer efficiency", ], "forcings": "euphotic-zone nutrient supply, mixed-layer light availability, and ocean warming stratification", "boundaries": "phytoplankton community size structure, mineral ballast (opal/CaCO3) ratios, and mesopelagic temperature", }, { "sub_id": "ocean_deoxygenation_omz_nitrogen_cycle", "keywords": r"\b(deoxygenation|oxygen\s+minimum\s+zone|omz|hypoxi\w+|anoxi\w+|euxini\w+|denitrification|anammox|nitrification|nitrous\s+oxide|n2o|dissolved\s+oxygen|dead\s+zone)\b", "components": ["open_ocean", "continental_shelf"], "media": ["seawater", "dissolved_phase"], "processes": ["redox_transformation", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "interannual_to_decadal", "depth_range": "50–1,500 m", "observables": [ "GO-SHIP and BGC-Argo dissolved oxygen optode profiles, 15N-labeled incubation rates, and dual-isotope delta-15N/delta-18O nitrate", "in-situ nanomolar oxygen sensors (STOX) and dissolved N2/Ar and N2O saturation transects", ], "inferred": [ "solubility vs. ventilation vs. respiration controls on tropical Oxygen Minimum Zone (OMZ) expansion", "nanomolar oxygen thresholds triggering fixed-nitrogen loss via heterotrophic denitrification vs. anammox", ], "forcings": "thermocline ventilation slowdown, coastal eutrophication, and organic-matter export pulses", "boundaries": "equatorial zonal jet supply of oxygen, benthic sediment oxygen demand, and trace-metal enzyme cofactors", }, { "sub_id": "ocean_acidification_carbonate_alkalinity", "keywords": r"\b(ocean\s+acidification|aragonite|calcite\s+saturation|alkalinity|dissolved\s+inorganic\s+carbon|dic|pco2|air-sea\s+co2|carbonate\s+pump|coral\s+calcification|pteropod|lysocline|ccd)\b", "components": ["sea_surface", "marine_ecosystem"], "media": ["seawater", "dissolved_phase"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "chemical_weathering"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "interannual_to_decadal", "depth_range": "0–4,000 m", "observables": [ "SOCAT surface-ocean fCO2 database, GLODAP interior DIC/Total Alkalinity bottle data, and autonomous pH sensors", "boron/calcium ratios in calcifiers and benthic chamber carbonate dissolution flux measurements", ], "inferred": [ "decadal trends and seasonal variability in the global ocean anthropogenic carbon sink and Revelle buffer factor", "metabolic and mineralogical thresholds of shallow-water CaCO3 dissolution above the chemical saturation horizon", ], "forcings": "rising atmospheric pCO2, upwelling of DIC-rich waters, and biological production/calcification ratios", "boundaries": "seawater carbonate buffering capacity (TA:DIC ratio), temperature-dependent solubility, and benthic bioturbation", }, { "sub_id": "geotraces_trace_metals_hydrothermal_vents", "keywords": r"\b(geotraces|dissolved\s+iron|iron\s+limitation|hnls|trace\s+metal\w*|siderophore|ligand\w*|hydrothermal\s+vent|hydrothermal\s+plume|black\s+smoker|cold\s+seep|methane\s+seep|gas\s+hydrate|chemosynthe\w*)\b", "components": ["hydrothermal_system", "deep_ocean"], "media": ["seawater", "hydrothermal_fluid"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "redox_transformation"], "spatial_scale": "ocean_basin_or_gyre", "temporal_scale": "interannual_to_decadal", "depth_range": "0–5,000 m", "observables": [ "GEOTRACES trace-metal-clean full-depth transects (dFe, dZn, dCo, dMn, dCu) and competitive ligand voltammetry", "3He/4He plume tracers, ROV hydrothermal fluid samplers, and iron/zinc/cadmium stable isotope profiles", ], "inferred": [ "organic ligand complexation and colloidal Nanoparticle stabilization enabling thousand-kilometer hydrothermal iron transport", "relative contributions of aeolian dust, margin sediments, and mid-ocean ridges to micronutrient trace-metal inventories", ], "forcings": "seafloor hydrothermal venting, mineral dust deposition, and nepheloid-layer sediment resuspension", "boundaries": "siderophore binding-ligand concentrations, particle scavenging rates, and abyssal redox state", }, { "sub_id": "marine_sediment_early_diagenesis_benthic_flux", "keywords": r"\b(early\s+diagenesis|benthic\s+flux|porewater|pore\s+water|sulfate\s+reduction|anaerobic\s+oxidation\s+of\s+methane|aom|smtz|sulfate-methane|bioturbation|bioirrigation|authigenic|mangrove\s+blue\s+carbon|seagrass|blue\s+carbon)\b", "components": ["marine_sediment", "seafloor"], "media": ["marine_sediment", "porewater"], "processes": ["redox_transformation", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "sedimentary_basin_or_continental_margin", "temporal_scale": "centennial_to_millennial", "depth_range": "0–100 m below seafloor (mbsf)", "observables": [ "multicorer porewater concentration/isotope profiles (SO4, CH4, DIC, NH4, Fe2+, H2S) and benthic lander microprofilers", "reaction-transport diagenetic modeling and lipid biomarker/metagenomic profiles across the SMTZ", ], "inferred": [ "efficiency of the benthic microbial methane filter (AOM) and authigenic carbonate/pyrite burial sinks", "organo-mineral protection vs. priming controlling long-term organic carbon preservation in continental margin muds", ], "forcings": "sedimentation rate, organic-matter labile flux, and bottom-water oxygen fluctuations", "boundaries": "macrofaunal bioirrigation depth, reactive iron-oxide supply, and upward methane advective flux", }, ], 11: [ { "sub_id": "catchment_runoff_transit_time_uph", "keywords": r"\b(catchment|watershed|runoff|streamflow|hydrograph|baseflow|transit\s+time|residence\s+time|young\s+water|old\s+water|storages?-discharge|rainfall-runoff|ungauged|flood\s+frequency|non-stationar\w+)\b", "components": ["river", "vadose_zone"], "media": ["freshwater_surface", "pore_water"], "processes": ["hydrological_partitioning_and_runoff", "groundwater_flow_and_transport"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–100 m", "observables": [ "high-frequency stream and precipitation stable water isotopes (delta-18O, delta-2H), electrical conductivity, and discharge", "nested hillslope tensiometer/piezometer networks and StorAge Selection (SAS) transit-time distributions", ], "inferred": [ "paradoxical rapid mobilization of 'old' pre-event stored water during storm hydrograph peaks", "emergent catchment-scale storage-discharge constitutive relations from heterogeneous hillslope preferential flow", ], "forcings": "convective vs. stratiform storm hyetographs, antecedent soil moisture, and seasonal potential evapotranspiration", "boundaries": "bedrock topography, macropore/fracture network connectivity, and catchment geomorphometric scaling", }, { "sub_id": "groundwater_aquifer_karst_fractured_flow", "keywords": r"\b(groundwater|aquifer|karst\s+aquifer|fractured\s+rock|piezomet\w+|hydraulic\s+conductivity|water\s+table|recharge|depletion|grace\s+groundwater|artesian|well\w*|transmissivity|storativity|subsidence\s+from\s+pumping)\b", "components": ["aquifer", "groundwater"], "media": ["groundwater", "sedimentary_rock"], "processes": ["groundwater_flow_and_transport", "hydrological_partitioning_and_runoff"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "interannual_to_decadal", "depth_range": "5–1,000 m", "observables": [ "multi-level monitoring well piezometric heads, GRACE/GRACE-FO terrestrial water storage anomalies, and InSAR aquifer deformation", "environmental age tracers (3H/3He, 14C, 85Kr, 36Cl, noble gases) and cross-borehole hydraulic tomography", ], "inferred": [ "upscaling of hydraulic conductivity and anomalous non-Fickian solute dispersion from pore to regional aquifer scales", "diffuse vs. focused ephemeral-channel groundwater recharge rates and fossil-aquifer renewal timescales", ], "forcings": "episodic wet-year recharge pulses, anthropogenic groundwater abstraction, and multi-year drought", "boundaries": "aquitard confining continuity, karst conduit/matrix dual porosity, and fault-zone hydraulic barriers", }, { "sub_id": "vadose_zone_evapotranspiration_ecohydrology", "keywords": r"\b(vadose|unsaturated\s+zone|soil\s+moisture|evapotranspiration|transpiration|sap\s+flow|stomatal|root\s+water\s+uptake|ecohydrolog\w+|water\s+use\s+efficiency|budyko|infiltration|preferential\s+flow|macropore)\b", "components": ["vadose_zone", "critical_zone"], "media": ["pore_water", "soil"], "processes": ["hydrological_partitioning_and_runoff", "ecosystem_disturbance_and_biophysical_feedback"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "diurnal_to_synoptic", "depth_range": "0–30 m", "observables": [ "cosmic-ray neutron rover soil moisture, eddy-covariance latent heat fluxes, and xylem/soil water stable isotopes", "sap-flow sensors, electrical resistivity imaging of root zones, and SMAP/Sentinel-1 microwave soil moisture", ], "inferred": [ "partitioning of terrestrial evapotranspiration between plant transpiration (T) and soil/canopy evaporation (E)", "ecohydrological separation ('two water worlds') between tightly bound matrix water used by roots and mobile recharge water", ], "forcings": "vapor pressure deficit (VPD), solar radiation, and intermittent rainfall infiltration pulses", "boundaries": "soil water retention curve hysteresis, deep-rooting architecture, and bedrock fracture water storage", }, { "sub_id": "hyporheic_river_groundwater_lake_wetland", "keywords": r"\b(hyporheic|losing\s+stream|gaining\s+stream|surface\s+water-groundwater|sw-gw|lake\s+hydrology|wetland\s+hydrology|riparian|intermittent\s+river|ephemeral\s+stream|swot|river\s+discharge\s+from\s+space)\b", "components": ["river", "wetland"], "media": ["freshwater_surface", "pore_water"], "processes": ["groundwater_flow_and_transport", "hydrological_partitioning_and_runoff"], "spatial_scale": "reach", "temporal_scale": "synoptic_to_seasonal", "depth_range": "0–20 m", "observables": [ "fiber-optic distributed temperature sensing (FO-DTS), 222Rn/He exchange tracers, and streambed vertical head gradients", "SWOT wide-swath satellite water-surface elevation/slope and wetland inundation hydroperiod maps", ], "inferred": [ "multi-scale hyporheic exchange residence-time distributions driven by bedforms, bars, and meandering", "bidirectional hydrologic connectivity between non-perennial rivers, floodplain wetlands, and alluvial aquifers", ], "forcings": "stage fluctuations, bedform-induced hydrostatic/hydrodynamic pressure gradients, and seasonal water-table shifts", "boundaries": "streambed clogging (colmation) layer permeability, alluvial sediment heterogeneity, and channel sinuosity", }, { "sub_id": "hydroclimatic_extremes_floods_drought_propagation", "keywords": r"\b(hydrological\s+drought|meteorological\s+drought|drought\s+propagation|flash\s+flood|urban\s+flood|snowmelt\s+flood|probabilistic\s+flood|water\s+scarcity|reservoir\s+regulation|human-water|socio-hydrolog\w+)\b", "components": ["hydrosphere_freshwater", "river"], "media": ["freshwater_surface", "groundwater"], "processes": ["hydrological_partitioning_and_runoff", "groundwater_flow_and_transport"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "interannual_to_decadal", "depth_range": "Surface to regional aquifer", "observables": [ "multi-decade stream-gauge networks, standardized precipitation/runoff/groundwater drought indices, and satellite altimetry", "coupled land-surface/hydrodynamic routing models and remotely sensed irrigation/reservoir storage records", ], "inferred": [ "attenuation, lag time, and nonlinear memory governing meteorological-to-soil-to-groundwater drought propagation", "antagonistic vs. compounding feedbacks between human water-management adaptations and extreme flood/drought risk", ], "forcings": "persistent precipitation deficits, extreme atmospheric-river or monsoon rainfall, and human abstraction/impoundment", "boundaries": "basin hydrogeological buffer capacity, soil/aquifer storage memory, and reservoir operating topology", }, ], 12: [ { "sub_id": "soil_organic_carbon_mineral_stabilization_priming", "keywords": r"\b(soil\s+organic\s+carbon|soc|soil\s+organic\s+matter|som|maoc|mineral-associated\s+organic|particulate\s+organic\s+matter|pom|priming\s+effect|necromass|microbial\s+carbon\s+use\s+efficiency|cue|soil\s+respiration|heterotrophic\s+respiration|deep\s+soil\s+carbon)\b", "components": ["soil", "critical_zone"], "media": ["soil", "biota"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "chemical_weathering"], "spatial_scale": "molecular_to_pore", "temporal_scale": "decadal", "depth_range": "0–2 m soil profile", "observables": [ "density/size fractionation (MAOM vs. POM), 13C/14C isotopic pulse-labeling, and solid-state 13C NMR / NanoSIMS", "long-term soil warming manipulation plots and automated chamber heterotrophic respiration fluxes", ], "inferred": [ "relative dominance of microbial necromass entombment, organo-mineral sorption, and microaggregate occlusion in SOC persistence", "thermal adaptation of microbial carbon-use efficiency (CUE) and root-exudate priming of ancient subsoil carbon", ], "forcings": "soil warming, labile root-exudate inputs, and drying-rewetting Birch-effect cycles", "boundaries": "reactive short-range-order Fe/Al oxyhydroxide content, clay mineralogy, and soil pore-network connectivity", }, { "sub_id": "critical_zone_weathering_regolith_architecture", "keywords": r"\b(critical\s+zone|saprolite|bedrock\s+weathering|weathering\s+front|chemical\s+weathering\s+rate|silicate\s+weathering|regolith\s+thickness|porosity\s+generation|fracture\s+weathering|solute\s+flux|concentration-discharge|c-q)\b", "components": ["critical_zone", "regolith"], "media": ["crystalline_rock", "pore_water"], "processes": ["chemical_weathering", "groundwater_flow_and_transport"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "millennial_to_orbital", "depth_range": "0–100 m (canopy to unweathered bedrock)", "observables": [ "deep Critical Zone borehole cores, seismic refraction/resistivity tomography, and mass-transfer tau (τ) profiles", "high-frequency stream concentration-discharge (C-Q) chemostatic slopes and Li/Mg/Si/U-series weathering isotopes", ], "inferred": [ "topographic stress, frost cracking, and deep oxidative/acid reactions controlling the depth of the bedrock weathering front", "mechanisms explaining chemostatic solute behavior across orders-of-magnitude discharge variations", ], "forcings": "meteoric water infiltration, biogenic soil CO2/organic-acid production, and tectonic exhumation", "boundaries": "regional tectonic stress field, bedrock mineral assemblage (pyrite/biotite/plagioclase), and transit time", }, { "sub_id": "rhizosphere_mycorrhiza_nutrient_stoichiometry", "keywords": r"\b(rhizosphere|root\s+exudat\w*|mycorrhiz\w*|arbuscular|ectomycorrhiz\w*|phosphorus\s+limitation|nitrogen\s+mineralization|nitrification\s+in\s+soil|denitrification\s+in\s+soil|soil\s+n2o|stoichiometr\w*|extracellular\s+enzyme)\b", "components": ["soil", "biosphere_terrestrial"], "media": ["soil", "pore_water"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "redox_transformation"], "spatial_scale": "plot_scale", "temporal_scale": "seasonal", "depth_range": "0–1 m rooting zone", "observables": [ "zuckering/microdialysis rhizosphere exudate probes, 15N/33P isotopic pool dilution, and zymography enzyme imaging", "metatranscriptomic functional gene abundance and quantum-cascade-laser N2O isotopomer fluxes", ], "inferred": [ "carbon cost and mineral-dissolution efficiency of ectomycorrhizal vs. arbuscular mycorrhizal nutrient mining", "hotspots and hot moments of anaerobic denitrification and N2O production inside oxic soil aggregates", ], "forcings": "elevated atmospheric CO2 fertilization, chronic nitrogen deposition, and rhizosphere diurnal water pulses", "boundaries": "soil C:N:P stoichiometry, aggregate oxygen micro-gradients, and soil pH buffering", }, { "sub_id": "peatland_wetland_redox_methane_biogeochemistry", "keywords": r"\b(peatland\w*|bog|fen|mire|sphagnum|wetland\s+soil|paddy\s+soil|methanogen\w*|methanotroph\w*|anaerobic\s+oxidation|iron\s+reduction|redox\s+oscillation|water-table\s+fluctuation|phenolic\s+enzyme\s+latch)\b", "components": ["peatland", "wetland"], "media": ["soil", "pore_water"], "processes": ["redox_transformation", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "landscape", "temporal_scale": "seasonal", "depth_range": "0–10 m peat column", "observables": [ "automated chamber/eddy-covariance CH4 and CO2 fluxes, porewater dissolved CH4/δ13C-CH4, and voltammetric redox profiles", "Mössbauer spectroscopy of iron-organic complexes and microbial 16S/mcrA/pmoA amplicon sequencing", ], "inferred": [ "stability of the 'enzymatic latch' and 'iron gate' under drought-induced water-table drawdown and rewetting", "partitioning between ebullition, aerenchyma plant-mediated transport, and aerobic methanotrophic oxidation", ], "forcings": "water-table drawdown, warming, and sulfate/nitrate electron-acceptor deposition", "boundaries": "peat botanical composition (Sphagnum vs. vascular sedges), hydraulic conductivity (acrotelm vs. catotelm)", }, { "sub_id": "dryland_biocrust_inorganic_carbon_caliche", "keywords": r"\b(soil\s+inorganic\s+carbon|sic|pedogenic\s+carbonate|caliche|calcrete|biocrust|biological\s+soil\s+crust|arid\s+soil|salinization|sodic\s+soil|photodegradation)\b", "components": ["dryland", "soil"], "media": ["soil", "pore_water"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "chemical_weathering"], "spatial_scale": "regional", "temporal_scale": "decadal", "depth_range": "0–3 m", "observables": [ "clumped (Delta47) and stable (delta-13C, delta-18O) isotopes of pedogenic carbonates and soil CO2 efflux chambers", "hyperspectral biocrust mapping and abiotic UV photodegradation litterbag experiments", ], "inferred": [ "abiotic vs. biotic controls on dryland CO2 uptake/efflux and soil inorganic carbon (SIC) dissolution losses under acidification", "coupling between UV photodegradation, non-rainfall water inputs (dew/fog), and biocrust nitrogen fixation", ], "forcings": "pulsed rain events (Noy-Meir pulses), solar UV irradiance, and nitrogen/acid deposition", "boundaries": "soil Ca2+/Mg2+ availability, pH alkalinity, and biocrust cyanobacterial/lichen succession stage", }, ], 13: [ { "sub_id": "forest_mortality_drought_carbon_sink", "keywords": r"\b(forest\s+mortality|tree\s+mortality|hydraulic\s+failure|carbon\s+starvation|xylem\s+embolism|cavitation|amazon\s+dieback|tropical\s+forest\s+carbon|boreal\s+forest|gross\s+primary\s+productivity|gpp|net\s+ecosystem\s+exchange|nee|co2\s+fertilization)\b", "components": ["forest", "biosphere_terrestrial"], "media": ["biota", "tropospheric_air"], "processes": ["ecosystem_disturbance_and_biophysical_feedback", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "continental", "temporal_scale": "interannual_to_decadal", "depth_range": "Rooting zone to forest canopy top", "observables": [ "FLUXNET eddy-covariance NEE/GPP time series, RAINFOR/ForestGEO permanent census plots, and satellite SIF/VOD", "xylem vulnerability curves (P50/P88), non-structural carbohydrate (NSC) assays, and GEDI spaceborne LiDAR biomass", ], "inferred": [ "physiological thresholds separating xylem hydraulic failure from carbon starvation during multi-year mega-droughts", "saturation of the terrestrial CO2 fertilization sink due to phosphorus/nitrogen limitation and rising VPD", ], "forcings": "atmospheric vapor pressure deficit (VPD) extremes, heatwaves, and elevated atmospheric CO2", "boundaries": "plant hydraulic trait diversity (isohydric vs. anisohydric), rooting depth to groundwater, and soil fertility", }, { "sub_id": "wildfire_regimes_pyrogenic_carbon_recovery", "keywords": r"\b(wildfire\w*|fire\s+regime|burned\s+area|megafire|pyrogenic\s+carbon|black\s+carbon|charcoal|post-fire|fire\s+severity|savanna\s+fire|boreal\s+fire|peat\s+fire|flammability|fuel\s+moisture)\b", "components": ["forest", "grassland"], "media": ["biota", "tropospheric_air"], "processes": ["ecosystem_disturbance_and_biophysical_feedback", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "regional", "temporal_scale": "interannual_to_decadal", "depth_range": "Organic soil horizon to smoke plume injection height", "observables": [ "MODIS/VIIRS active-fire radiative power, Landsat/Sentinel-2 burn-severity (dNBR) maps, and tree-ring fire scars", "benzene polycarboxylic acid (BPCA) pyrogenic carbon markers and post-fire chronosequence regeneration surveys", ], "inferred": [ "climate-driven vs. fuel-limitation switches in global burned area and boreal-to-deciduous post-fire state shifts", "production, erosion, and millennial residence time of pyrogenic carbon (PyC) across terrestrial-to-marine continuum", ], "forcings": "fire-weather indices (VPD, wind), dry lightning ignition, and human fire suppression/fragmentation", "boundaries": "live/dead fuel moisture connectivity, bark thickness/serotiny traits, and organic-layer thickness", }, { "sub_id": "land_use_change_albedo_biophysical_feedbacks", "keywords": r"\b(deforestation|afforestation|reforestation|land-use\s+change|land\s+cover\s+change|lulcc|biophysical\s+feedback|surface\s+albedo|roughness\s+length|evaporative\s+cooling|woody\s+encroachment|greening|browning|shifting\s+cultivation)\b", "components": ["biosphere_terrestrial", "boundary_layer"], "media": ["biota", "tropospheric_air"], "processes": ["ecosystem_disturbance_and_biophysical_feedback", "radiative_transfer_and_energy_balance"], "spatial_scale": "continental", "temporal_scale": "decadal", "depth_range": "Soil profile to planetary boundary layer", "observables": [ "paired forest vs. open-land flux towers, MODIS/Landsat radiometric skin temperature (LST) and albedo, and LUMIP ensembles", "high-resolution canopy height/LAI maps and atmospheric moisture-recycling trajectory models", ], "inferred": [ "net local and nonlocal climate warming/cooling trade-offs between biogeochemical carbon sequestration and biophysical albedo/evapotranspiration changes", "upwind deforestation thresholds for downwind precipitation collapse in continental moisture-recycling sheds", ], "forcings": "agricultural expansion, large-scale tree-planting campaigns, and high-latitude shrubification", "boundaries": "background snow cover duration, boundary-layer cloud coupling, and soil moisture availability", }, { "sub_id": "phenology_treeline_permafrost_ecosystem_shifts", "keywords": r"\b(phenolog\w+|green-up|senescence|growing\s+season|treeline|alpine\s+tundra|arctic\s+greening|shrubification|species\s+range\s+shift|insect\s+outbreak|bark\s+beetle|windthrow|peatland\s+vegetation)\b", "components": ["biosphere_terrestrial", "forest"], "media": ["biota", "soil"], "processes": ["ecosystem_disturbance_and_biophysical_feedback", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "regional", "temporal_scale": "interannual_to_decadal", "depth_range": "Rooting zone to canopy", "observables": [ "PhenoCam near-surface digital imagery, satellite NDVI/EVI/SIF phenology retrievals, and dendroecological ring widths", "open-top chamber (ITEX) tundra warming experiments and insect-defoliation aerial surveys", ], "inferred": [ "photoperiod, winter chilling, and spring frost-damage constraints on advancing spring leaf-out and autumn senescence", "coupled biotic disturbance (bark beetle/pathogen) and microclimatic bottlenecks governing alpine/polar treeline migration", ], "forcings": "winter/spring asymmetrical warming, late-spring frost events, and snowmelt timing shifts", "boundaries": "photoperiod latitude limits, mycorrhizal symbiont dispersal, and alpine soil development", }, { "sub_id": "agricultural_agroecosystem_ghg_nitrogen", "keywords": r"\b(agricultural|cropland|agroecosystem|paddy|fertilizer|manure|nitrous\s+oxide\s+emission|ammonia\s+volatilization|nitrate\s+leaching|cover\s+crop|no-till|biochar|grazing|pasture|rangeland)\b", "components": ["agricultural_land", "soil"], "media": ["soil", "tropospheric_air"], "processes": ["carbon_cycle_and_biogeochemical_cycling", "contaminant_transport_and_fate"], "spatial_scale": "landscape", "temporal_scale": "seasonal", "depth_range": "0–2 m plow and root zone", "observables": [ "automated static/dynamic chamber N2O/CH4/NH3 flux networks, lysimeter nitrate leaching, and 15N fertilizer recovery", "regional tall-tower inverse atmospheric trace-gas budgets and multi-decade long-term agricultural trials", ], "inferred": [ "nonlinear emission factors (EFs) for soil N2O hot moments following freeze-thaw, tillage, and fertigation pulses", "trade-offs where soil carbon sequestration practices (no-till, residue retention, flooding) stimulate N2O or CH4 emissions", ], "forcings": "synthetic nitrogen/manure application timing, irrigation wetting-drying cycles, and tillage disturbance", "boundaries": "soil bulk density, water-filled pore space (WFPS), and nitrifier/denitrifier community structure", }, ], 14: [ { "sub_id": "pfas_forever_chemicals_transport_fate", "keywords": r"\b(pfas|per-\s*and\s+polyfluoroalkyl|pfos|pfoa|genx|fluorotelomer|afff|forever\s+chemical\w*|organofluorine|ultrashort-chain|perfluorinated)\b", "components": ["vadose_zone", "groundwater"], "media": ["groundwater", "pore_water"], "processes": ["contaminant_transport_and_fate", "groundwater_flow_and_transport"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "decadal", "depth_range": "0–100 m", "observables": [ "LC-HRMS suspect/non-target screening, extractable organic fluorine (EOF) mass balance, and total oxidizable precursor (TOP) assays", "unsaturated-zone lysimeter profiles and air-water interface adsorption surface-tension isotherms", ], "inferred": [ "air-water interfacial adsorption and surfactant self-assembly retarding PFAS leaching through the vadose zone", "biotransformation pathways of polyfluorinated precursors into terminal perfluoroalkyl acids and sea-spray atmospheric cycling", ], "forcings": "infiltration wetting-front velocity, ionic strength fluctuations, and co-contaminant NAPL/surfactant presence", "boundaries": "vadose-zone air-water interfacial area, soil organic carbon electrostatic charge, and chain-length hydrophobicity", }, { "sub_id": "microplastics_nanoplastics_weathering_vectors", "keywords": r"\b(microplastic\w*|nanoplastic\w*|plastic\s+debris|polymer\s+weathering|plastisphere|tire\s+wear|6ppd|synthetic\s+fiber\w*|microfiber\w*|plastic\s+sedimentation)\b", "components": ["river", "marine_sediment"], "media": ["freshwater_surface", "fluvial_or_coastal_sediment"], "processes": ["contaminant_transport_and_fate", "sediment_transport_and_deposition"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "interannual_to_decadal", "depth_range": "Surface waters to deep-sea benthic sediments", "observables": [ "micro-FTIR, micro-Raman, and pyrolysis-GC-MS polymer quantification down to sub-micron nanoplastic scales", "settling-column biofouling experiments and dated sediment-core microplastic accumulation profiles", ], "inferred": [ "closure of the 'missing ocean plastic' mass budget via UV-photooxidative fragmentation into dissolved organic carbon and nanoplastics", "biofilm heteroaggregation ('plastisphere') altering buoyancy, vertical settling velocities, and co-contaminant/AMR vectoring", ], "forcings": "solar UV irradiance, hydrodynamic shear fragmentation, and microbial biofouling succession", "boundaries": "polymer crystallinity/density, suspended mineral floc concentration, and estuarine salinity fronts", }, { "sub_id": "heavy_metals_mercury_arsenic_methylation_redox", "keywords": r"\b(mercury|methylmercury|hg|arsenic|arsenite|arsenate|cadmium|lead\s+contamination|chromium|hexavalent|antimony|thallium|selenium|acid\s+mine\s+drainage|amd|mine\s+tailing\w*|heavy\s+metal\w*|metalloid\w*)\b", "components": ["aquifer", "soil"], "media": ["groundwater", "sediment"], "processes": ["contaminant_transport_and_fate", "redox_transformation"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "interannual_to_decadal", "depth_range": "0–200 m", "observables": [ "synchrotron XANES/EXAFS solid-phase speciation, multi-collector ICP-MS Hg mass-independent fractionation (Delta199Hg), and HPLC-ICP-MS", "hgcAB mercury-methylation gene transcripts and redox-stat bioreactor mobilization kinetics", ], "inferred": [ "coupled iron-sulfur-organic-matter redox cycling governing reductive dissolution of arsenic-bearing Fe(III) oxyhydroxides", "bioavailability of thiol-complexed versus nanoparticulate HgS for microbial hgcAB methylation across redoxclines", ], "forcings": "seasonal water-table redox oscillations, labile organic carbon supply, and sulfate/nitrate inputs", "boundaries": "host-mineral crystallinity, dissolved organic matter aromaticity/thiol content, and pH-Eh conditions", }, { "sub_id": "emerging_organic_contaminants_ppcp_arg_pesticides", "keywords": r"\b(emerging\s+contaminant\w*|pharmaceutical\w*|ppcp\w*|antibiotic\s+resistance\s+gene\w*|arg\w*|antibiotic\w*|pesticide\w*|herbicide\w*|atrazine|glyphosate|neonicotinoid|endocrine\s+disrupt\w*|pahs|pcbs|dioxin\w*|chlorinated\s+solvent|tce|dnaPL)\b", "components": ["river", "aquifer"], "media": ["freshwater_surface", "groundwater"], "processes": ["contaminant_transport_and_fate", "redox_transformation"], "spatial_scale": "river_basin_or_aquifer", "temporal_scale": "seasonal", "depth_range": "0–50 m", "observables": [ "compound-specific isotope analysis (CSIA: delta-13C, delta-2H, delta-15N, delta-37Cl) and passive sampler time-weighted concentrations", "high-throughput qPCR/metagenomic resistome profiling and photolysis/biotransformation product identification", ], "inferred": [ "distinguishing in-situ abiotic/microbial degradation from physical dilution and sorption using multi-element CSIA", "environmental coselection thresholds (sub-inhibitory metals/biocides) driving horizontal transfer of antibiotic resistance genes", ], "forcings": "wastewater effluent discharge, agricultural runoff pulses, and solar photolysis", "boundaries": "hyporheic residence time, black-carbon/kerogen nonlinear sorption domains, and microbial community adaptation", }, { "sub_id": "radionuclides_nutrient_eutrophication_harmful_blooms", "keywords": r"\b(radionuclide\w*|cesium-137|strontium-90|plutonium|technetium|spent\s+nuclear|geological\s+repository|eutrophication|harmful\s+algal\s+bloom\w*|hab\w*|cyanotoxin|microcystin|legacy\s+phosphorus|internal\s+loading|lake\s+hypoxia)\b", "components": ["lake", "estuary"], "media": ["freshwater_surface", "lake_sediment"], "processes": ["contaminant_transport_and_fate", "carbon_cycle_and_biogeochemical_cycling"], "spatial_scale": "hillslope_to_catchment", "temporal_scale": "interannual_to_decadal", "depth_range": "0–500 m", "observables": [ "high-frequency lake buoy phycocyanin/chlorophyll/DO sensors, benthic chamber phosphorus fluxes, and 31P-NMR sediment speciation", "gamma/alpha spectrometry and accelerator mass spectrometry (AMS) of long-lived actinides and fission products", ], "inferred": [ "decadal lag times and benthic internal phosphorus recycling sustaining harmful cyanobacterial blooms after external load reductions", "colloid-facilitated transport and bentonite-barrier retardation of long-lived radionuclides over millennial timescales", ], "forcings": "thermal stratification intensification, internal wave mixing, and catchment legacy nutrient mobilization", "boundaries": "sediment Fe:P:S molar ratios, lake bathymetric residence time, and host-rock fracture aperture", }, ], 15: [ { "sub_id": "coastal_morphodynamics_shoreline_barrier_marshes", "keywords": r"\b(coast\w*|shoreline|beach\s+erosion|barrier\s+island|overwash|salt\s+marsh|mangrove|tidal\s+flat|wave\s+runup|storm\s+surge|longshore|dune\s+erosion|coral\s+reef\s+hydrodynamics|headland)\b", "components": ["coast", "wetland"], "media": ["fluvial_or_coastal_sediment", "seawater"], "processes": ["coastal_and_estuarine_morphodynamics", "sediment_transport_and_deposition"], "spatial_scale": "coastal_cell", "temporal_scale": "interannual_to_decadal", "depth_range": "0–30 m", "observables": [ "airborne bathymetric LiDAR, Argus video/satellite shoreline positions, and surface elevation tables (SETs) in marshes", "acoustic wave/current profilers and X-band radar nearshore wave-breaking dissipation fields", ], "inferred": [ "ecogeomorphic vertical accretion limits of salt marshes and mangroves relative to accelerating sea-level rise", "cross-shore vs. alongshore sediment bypassing and post-storm beach/barrier recovery hysteresis", ], "forcings": "relative sea-level rise, tropical/extratropical storm-surge wave power, and spring-neap tidal currents", "boundaries": "suspended sediment supply, halophyte root-mat organic production, and shoreface geologic framework", }, { "sub_id": "river_deltas_avulsion_subsidence_salinity", "keywords": r"\b(delta\w*|estuar\w*|distributary|salt\s+intrusion|salinity\s+intrusion|saltwater\s+intrusion|submarine\s+groundwater\s+discharge|sgd|turbidity\s+maximum|etm|deltaic\s+subsidence|avulsion)\b", "components": ["delta", "estuary"], "media": ["fluvial_or_coastal_sediment", "seawater"], "processes": ["coastal_and_estuarine_morphodynamics", "sediment_transport_and_deposition"], "spatial_scale": "sedimentary_basin_or_continental_margin", "temporal_scale": "interannual_to_decadal", "depth_range": "0–100 m", "observables": [ "InSAR + rod-extensometer vertical compaction rates, ADCP/CTD estuarine salt-flux transects, and 222Rn/226Ra SGD tracers", "multi-decadal bathymetric surveys and upstream dam-trapping sediment-load time series", ], "inferred": [ "partitioning of deltaic relative sea-level rise between shallow Holocene mud compaction, deep tectonic subsidence, and groundwater/hydrocarbon extraction", "three-dimensional estuarine exchange flow, estuarine turbidity maximum (ETM) trapping, and saltwater intrusion length under channel deepening", ], "forcings": "upstream reservoir sediment starvation, channel dredging, groundwater pumping, and sea-level rise", "boundaries": "distributary bifurcation geometry, Holocene peat/mud thickness, and coastal aquifer hydraulic gradient", }, { "sub_id": "urban_heat_island_canyon_hydrology_emissions", "keywords": r"\b(urban|city|cities|street\s+canyon|urban\s+heat\s+island|uhi|impervious|stormwater|green\s+infrastructure|urban\s+canopy|anthropogenic\s+heat|urban\s+boundary\s+layer|urban\s+flood\w*|urban\s+plume)\b", "components": ["urban_environment", "boundary_layer"], "media": ["urban_built_substrate", "tropospheric_air"], "processes": ["radiative_transfer_and_energy_balance", "hydrological_partitioning_and_runoff"], "spatial_scale": "local_landscape_or_urban", "temporal_scale": "diurnal_to_synoptic", "depth_range": "Subsurface sewer/groundwater to urban boundary layer", "observables": [ "urban eddy-covariance flux towers, dense crowdsourced microclimate networks, and thermal-infrared satellite/airborne LST", "high-resolution urban storm-drainage gauge networks and mobile urban CH4/CO2/NOx plume mapping", ], "inferred": [ "synergistic nonlinear amplification between background synoptic heatwaves and urban heat islands (UHI)", "convective rainfall enhancement downwind of urban roughness/heat domes and subsurface 'urban karst' runoff routing", ], "forcings": "anthropogenic waste heat release, 3D street-canyon radiative trapping, and impervious surface sealing", "boundaries": "urban morphological aspect ratio (H/W), albedo/thermal admittance of built materials, and urban tree-canopy fraction", }, { "sub_id": "dryland_desertification_oasis_dust_coupled", "keywords": r"\b(dryland\w*|desertification|semi-arid|hyper-arid|oasis|saline\s+lake|endorheic|aral\s+sea|playa|agro-pastoral|overgrazing|shelterbelt|sand\s+fixation)\b", "components": ["dryland", "lake"], "media": ["soil", "freshwater_surface"], "processes": ["ecosystem_disturbance_and_biophysical_feedback", "hydrological_partitioning_and_runoff"], "spatial_scale": "regional", "temporal_scale": "interannual_to_decadal", "depth_range": "Root/vadose zone to regional boundary layer", "observables": [ "multi-decadal satellite vegetation/albedo/water-body time series, groundwater monitoring wells, and dust deposition traps", "coupled ecohydrological-socioeconomic water balance models across endorheic river basins", ], "inferred": [ "critical grazing and water-diversion thresholds triggering irreversible dryland state shifts and terminal-lake desiccation", "regional water-table drawdown vs. microclimatic cooling trade-offs of dryland afforestation and oasis expansion", ], "forcings": "aridity index increases, upstream irrigation diversions, and livestock grazing intensity", "boundaries": "endorheic basin closed water budget, shallow groundwater salinity, and aeolian sand supply", }, { "sub_id": "coupled_human_natural_coastal_infra_risk", "keywords": r"\b(coupled\s+human|socio-environmental|nature-based\s+solution|living\s+shoreline|beach\s+nourishment|seawall|polder|managed\s+retreat|compound\s+flood\w*|fluvial-pluvial-coastal|multi-hazard)\b", "components": ["human_built_coastal_urban_interface", "coast"], "media": ["urban_built_substrate", "seawater"], "processes": ["coastal_and_estuarine_morphodynamics", "hydrological_partitioning_and_runoff"], "spatial_scale": "coastal_cell", "temporal_scale": "interannual_to_decadal", "depth_range": "Coastal nearshore to floodplain", "observables": [ "joint tide-gauge, river-discharge, and radar-rainfall extreme value series and hydrodynamic compound-flood hindcasts", "long-term morphological monitoring of hard coastal defenses versus nature-based sediment nourishments", ], "inferred": [ "statistical dependence and physical phase-locking between storm surge, extreme rainfall runoff, and coastal wave setup", "maladaptive lock-in ('levee/seawall effect') whereby coastal armoring accelerates adjacent downdrift erosion and subsidence", ], "forcings": "landfalling tropical/extratropical cyclones, sea-level rise, and coastal engineering interventions", "boundaries": "estuarine funneling geometry, seawall/levee crest elevations, and sediment littoral cell connectivity", }, ], } # Paper-specific observable patterns to enrich observables dynamically from paper text SPECIFIC_OBSERVABLE_RULES = [ (r"\b(zircon|u-pb|lu-hf)\b", "laser-ablation ICP-MS/SIMS zircon U-Pb geochronology and Lu-Hf isotope ratios"), (r"\b(speleothem|stalagmite)\b", "U-Th dated speleothem delta-18O, delta-13C, and trace-element laminae records"), (r"\b(foraminifer\w*|alkenone|tex86)\b", "planktic/benthic foraminiferal Mg/Ca, delta-18O, and organic biomarker paleothermometry"), (r"\b(cosmogenic|10be|26al)\b", "in-situ terrestrial cosmogenic nuclide (10Be, 26Al) surface exposure and denudation inventories"), (r"\b(insar|gnss|gps)\b", "multi-temporal InSAR surface displacement velocity fields and continuous GNSS station networks"), (r"\b(receiver\s+function|ambient\s+noise|shear-wave\s+splitting|tomograph\w+)\b", "broadband seismic tomography, receiver-function conversions, and shear-wave splitting measurements"), (r"\b(magnetotelluric|electrical\s+resistivity|ert)\b", "deep magnetotelluric (MT) and electrical resistivity tomography (ERT) conductivity inversions"), (r"\b(eddy\s+covariance|flux\s+tower)\b", "multi-year eddy-covariance micrometeorological flux-tower CO2, H2O, and energy exchange measurements"), (r"\b(argo|glider|ctd)\b", "autonomous Argo/BGC-Argo profiling floats, ocean gliders, and shipboard CTD hydrographic sections"), (r"\b(grace|grace-fo)\b", "GRACE/GRACE-FO satellite gravimetry terrestrial water storage and ice-mass anomaly fields"), (r"\b(lidar|sfm|photogrammetry)\b", "high-resolution airborne/terrestrial LiDAR and structure-from-motion (SfM) topographic differencing"), (r"\b(exafs|xanes|synchrotron|mössbauer|nmr|ft-icr-ms)\b", "synchrotron X-ray absorption spectroscopy (EXAFS/XANES) and high-resolution molecular spectroscopy"), (r"\b(metagenom\w*|metatranscriptom\w*|16s\s+rrna|qpcr)\b", "high-throughput metagenomic/metatranscriptomic sequencing and functional gene abundance profiling"), (r"\b(clumped\s+isotop\w*|delta47|Δ47)\b", "carbonate clumped-isotope (Delta47) paleothermometry and fluid delta-18O reconstructions"), (r"\b(boron\s+isotop\w*|δ11b)\b", "boron-isotope (delta-11B) pH and carbonate-system proxy measurements"), (r"\b(neodymium|εnd|radiogenic\s+pb|87sr/86sr)\b", "radiogenic Sr-Nd-Pb-Hf isotope provenance and water-mass tracer ratios"), (r"\b(radar|doppler|himawari|goes|modis|sentinel|landsat|tropomi|oco-2|icesat)\b", "multi-spectral/active satellite remote sensing and Doppler radar vertical profile retrievals"), ] # Expanded regional detection rules (35 specific Earth regions) REGION_RULES = [ (r"\b(tibet\w*|himalay\w*|karakoram|pamir|hindu\s+kush|hengduan|tarim|qaidam|tianshan|tian\s+shan)\b", "Himalaya–Tibetan Plateau and Central Asian Orogenic System"), (r"\b(north\s+china\s+craton|yangtze\s+craton|south\s+china\s+block|qinling|dabie|cathaysia|orodos|sichuan\s+basin|loess\s+plateau|yellow\s+river|yangtze\s+river)\b", "East Asian Cratons, Monsoon Basins, and Loess Plateau"), (r"\b(south\s+china\s+sea|east\s+china\s+sea|yellow\s+sea|bohai|kuroshio|okinawa\s+trough|western\s+pacific|mariana|izu-bonin|philippine\s+sea|japan\s+trench|nankai)\b", "Western Pacific Margin, Marginal Seas, and Subduction Trenches"), (r"\b(andes|andean|altiplano|atacama|patagoni\w*|peru-chile|nazca)\b", "Andean Cordillera and Peru–Chile Subduction Margin"), (r"\b(amazon\w*|congo\s+basin|borneo|indonesia\w*|maritime\s+continent|pantanal|cerrado)\b", "Humid Tropical River Basins and Maritime Continent"), (r"\b(antarct\w*|southern\s+ocean|weddell|ross\s+sea|amundsen|thwaites|pine\s+island|east\s+antarctic|west\s+antarctic)\b", "Antarctica and the Southern Ocean"), (r"\b(arctic|greenland|svalbard|barents|beaufort|chukchi|laptev|east\s+siberian|permafrost|boreal|alaska|yukon|mackenzie)\b", "Pan-Arctic Cryosphere, Greenland, and Boreal Permafrost Domain"), (r"\b(north\s+atlantic|subpolar\s+gyre|labrador\s+sea|irminger|nordic\s+seas|iceland\w*|gulf\s+stream|mid-atlantic\s+ridge)\b", "North Atlantic Basin and Mid-Atlantic Ridge"), (r"\b(mediterranean|alps|alpine|apennine\w*|aegean|hellenic|anatolia\w*|pyrenees|carpathian\w*|black\s+sea|red\s+sea|dead\s+sea)\b", "Alpine–Mediterranean Orogenic Belt and Marginal Seas"), (r"\b(east\s+african\s+rift|ethiopian\s+rift|afar|turkana|tanganyika|malawi|sahel|sahara\w*|namib|kalahari|southern\s+africa|kaapvaal)\b", "African Rift Systems, Cratons, and Sahel–Sahara Drylands"), (r"\b(cascadia|san\s+andreas|california|sierra\s+nevada|basin\s+and\s+range|colorado\s+plateau|yellowstone|appalachian\w*|gulf\s+of\s+mexico|mississippi|great\s+lakes|cheasapeake)\b", "North American Cordilleran, Cratonic, and Coastal Margin Systems"), (r"\b(indian\s+ocean|bay\s+of\s+bengal|arabian\s+sea|indo-gangetic|ganges|brahmaputra|indus|deccan|western\s+ghats)\b", "Indian Ocean Basin and South Asian Monsoon System"), (r"\b(australia\w*|great\s+barrier\s+reef|murray-darling|pilbara|yilgarn|tasman|new\s+zealand|hikurangi|alpine\s+fault)\b", "Australasian Cratons, Reefs, and Hikurangi–Alpine Margin"), (r"\b(equatorial\s+pacific|eastern\s+tropical\s+pacific|central\s+pacific|galapagos|hawaii\w*|east\s+pacific\s+rise|peruvian\s+upwelling)\b", "Tropical Pacific Upwelling, ENSO Waveguide, and East Pacific Rise"), ] ERA_RULES = [ (r"\b(hadean|archean|archaean|paleoproterozoic|mesoproterozoic|neoproterozoic|ediacaran|precambrian|great\s+oxidation|snowball\s+earth)\b", "Precambrian"), (r"\b(cambrian|ordovician|silurian|devonian|carboniferous|permian|paleozoic|end-permian)\b", "Paleozoic"), (r"\b(triassic|jurassic|cretaceous|mesozoic|cenomanian|turonian|aptian|toarcian)\b", "Mesozoic"), (r"\b(paleocene|eocene|oligocene|miocene|pliocene|paleogene|neogene|petm|cenozoic)\b", "Cenozoic"), (r"\b(pleistocene|last\s+glacial|lgm|deglaciation|younger\s+dryas|heinrich|interglacial|quaternary)\b", "Pleistocene"), (r"\b(holocene|mid-holocene|late\s+holocene|little\s+ice\s+age|medieval\s+climate)\b", "Holocene"), (r"\b(anthropocene|future|projection|cmip6|ssp\d|21st\s+century|warming\s+world|urban|pfas|microplastic|industrial)\b", "Anthropocene"), ] for _cid, _plist in SUBTOPIC_PROFILES.items(): for _p in _plist: _p["_rx"] = re.compile(_p["keywords"], flags=re.I) _COMPILED_OBS_RULES = [(re.compile(pat, flags=re.I), label) for pat, label in SPECIFIC_OBSERVABLE_RULES] _COMPILED_REGION_RULES = [(re.compile(pat, flags=re.I), label) for pat, label in REGION_RULES] _COMPILED_ERA_RULES = [(re.compile(pat, flags=re.I), label) for pat, label in ERA_RULES] def match_subtopic_profile(cat_id, title, open_sent, abstract=""): """Select the best-matching sub-discipline profile within cat_id using keyword overlap.""" profiles = SUBTOPIC_PROFILES[cat_id] text = f"{title} {title} {open_sent} {abstract}".lower() default_idx = 4 if cat_id == 1 else (1 if cat_id == 3 else 0) best_prof = profiles[default_idx] best_score = 0 for prof in profiles: matches = prof["_rx"].findall(text) score = len(matches) * 3 + len(set(matches)) * 5 if score > best_score: best_score = score best_prof = prof return best_prof def extract_rich_metadata(title, open_sent, abstract, sub_prof, idx_in_cat): """Extract paper-specific observables, region, and geologic era.""" text = f"{title} {open_sent} {abstract}" obs = [] for rx, label in _COMPILED_OBS_RULES: if rx.search(text) and label not in obs: obs.append(label) if len(obs) == 2: break for default_obs in sub_prof["observables"]: if len(obs) < 2 and default_obs not in obs: obs.append(default_obs) region = None for rx, reg_label in _COMPILED_REGION_RULES: if rx.search(text): region = reg_label break if not region: region_defaults = { "core_dynamo_inner_core": "Planetary Deep Interior (Inner and Outer Core)", "lower_mantle_plumes_transition_zone": "Global Mantle Transition Zone and Lower Mantle", "subduction_slab_mantle_wedge": "Circum-Pacific and Tethyan Subduction Margins", "continental_rifting_breakup_margins": "Continental Rift Systems and Rifted Passive Margins", "craton_orogen_continental_crust": "Archean–Proterozoic Cratons and Continental Orogens", "earthquake_rupture_fault_mechanics": "Plate-Boundary and Intraplate Seismogenic Fault Zones", "slow_slip_tremor_megathrust": "Subduction Megathrust Interfaces", "volcanic_plumbing_eruption_degassing": "Active Arc, Rift, and Hotspot Volcanic Systems", "tsunami_seafloor_displacement": "Tsunamigenic Subduction Trenches and Coastal Margins", "landslide_debris_flow_mass_wasting": "Steep Orogenic Hillslopes and Volcanic Edifices", "low_temp_aqueous_clay_sorption_interface": "Near-Surface Mineral–Water Interfaces and Regolith", "igneous_petrology_magmatic_differentiation": "Crustal and Upper-Mantle Magmatic Provinces", "hydrothermal_ore_deposits_metallogeny": "Magmatic–Hydrothermal and Submarine Metallogenic Belts", "isotope_geochemistry_geochronology": "Crustal and Mantle Geochemical Reservoirs", "high_pressure_mineral_physics_metamorphism": "High-Pressure Metamorphic Terranes and Deep Lithosphere", } region = region_defaults.get(sub_prof["sub_id"], "Global and Representative Regional Observatories") era = None for rx, era_label in _COMPILED_ERA_RULES: if rx.search(text): era = era_label break if not era: if sub_prof["temporal_scale"] in ("geological_deep_time", "billion_year_planetary", "multi_million_year_tectonic"): era = "Cenozoic" elif sub_prof["temporal_scale"] in ("millennial_to_orbital", "centennial_to_millennial"): era = "Quaternary" else: era = "Holocene" if idx_in_cat % 2 == 0 else "Anthropocene" return obs, region, era # Finite declarative verbs commonly found in research paper titles DECLARATIVE_VERB_MAP = [ (r"^(.+?)\s+(?:shows?|demonstrates?|indicates?|suggests?|supports?|implies?)\s+(?:that\s+)?(.+)$", "Evidence from {0} for {1}", "how {0} relates to {1}"), (r"^(.+?)\s+drives\s+(.+)$", "Controls of {0} on {1}", "how {0} drives {1}"), (r"^(.+?)\s+drive\s+(.+)$", "Controls of {0} on {1}", "how {0} drive {1}"), (r"^(.+?)\s+controls?\s+(.+)$", "Controls of {0} on {1}", "how {0} controls {1}"), (r"^(.+?)\s+tracks?\s+(.+)$", "Tracking of {1} by {0}", "how {0} tracks {1}"), (r"^(.+?)\s+reveals?\s+(.+)$", "{1} Inferred from {0}", "how {0} constrains {1}"), (r"^(.+?)\s+governs?\s+(.+)$", "Mechanisms by Which {0} Governs {1}", "how {0} governs {1}"), (r"^(.+?)\s+regulates?\s+(.+)$", "Regulation of {1} by {0}", "how {0} regulates {1}"), (r"^(.+?)\s+determines?\s+(.+)$", "Determination of {1} by {0}", "how {0} determines {1}"), (r"^(.+?)\s+influences?\s+(.+)$", "Influence of {0} on {1}", "how {0} influences {1}"), (r"^(.+?)\s+affects?\s+(.+)$", "Effects of {0} on {1}", "how {0} affects {1}"), (r"^(.+?)\s+promotes?\s+(.+)$", "Role of {0} in Promoting {1}", "how {0} promotes {1}"), (r"^(.+?)\s+enhances?\s+(.+)$", "Enhancement of {1} by {0}", "how {0} enhances {1}"), (r"^(.+?)\s+accelerates?\s+(.+)$", "Acceleration of {1} by {0}", "how {0} accelerates {1}"), (r"^(.+?)\s+triggers?\s+(.+)$", "Triggering of {1} by {0}", "how {0} triggers {1}"), (r"^(.+?)\s+induces?\s+(.+)$", "Induction of {1} by {0}", "how {0} induces {1}"), (r"^(.+?)\s+causes?\s+(.+)$", "Causal Link Between {0} and {1}", "how {0} causes {1}"), (r"^(.+?)\s+suppresses?\s+(.+)$", "Suppression of {1} by {0}", "how {0} suppresses {1}"), (r"^(.+?)\s+mitigates?\s+(.+)$", "Modulation of {1} by {0}", "how {0} modulates {1}"), (r"^(.+?)\s+modulates?\s+(.+)$", "Modulation of {1} by {0}", "how {0} modulates {1}"), (r"^(.+?)\s+dominates?\s+(.+)$", "Dominance of {0} in {1}", "the extent to which {0} dominates {1}"), (r"^(.+?)\s+explains?\s+(.+)$", "Mechanisms Explaining {1} via {0}", "whether {0} explains {1}"), (r"^(.+?)\s+shapes?\s+(.+)$", "Influence of {0} on {1}", "how {0} shapes {1}"), (r"^(.+?)\s+alters?\s+(.+)$", "Alteration of {1} by {0}", "how {0} alters {1}"), (r"^(.+?)\s+amplifies?\s+(.+)$", "Amplification of {1} by {0}", "how {0} amplifies {1}"), (r"^(.+?)\s+weakens?\s+(.+)$", "Weakening of {1} by {0}", "how {0} weakens {1}"), (r"^(.+?)\s+stabilizes?\s+(.+)$", "Stabilization of {1} by {0}", "how {0} stabilizes {1}"), (r"^(.+?)\s+constrains?\s+(.+)$", "Constraints from {0} on {1}", "how {0} constrains {1}"), (r"^(.+?)\s+limits?\s+(.+)$", "Limitation of {1} by {0}", "how {0} limits {1}"), (r"^(.+?)\s+sustains?\s+(.+)$", "Sustaining of {1} by {0}", "how {0} sustains {1}"), (r"^(.+?)\s+maintains?\s+(.+)$", "Maintenance of {1} by {0}", "how {0} maintains {1}"), (r"^(.+?)\s+is\s+(?:recycled|transported|mobilized|trapped|stored|released)\s+(.+)$", "Mechanisms of {0} Cycling {1}", "how {0} is cycled {1}"), ] _COMPILED_DECL_MAP = [(re.compile(pat, flags=re.I), tf, sf) for pat, tf, sf in DECLARATIVE_VERB_MAP] _RX_BAD_DECL_A = re.compile(r"\b(?:as|for|to|of|in|on|with|by|from|and|or|the|a|an|their|its|our|between|among|under|during|through|via)$", re.I) _RX_BAD_DECL_B = re.compile(r"^(?:of|in|on|for|from|with|by|at|to|and|or|as|between|among)\b", re.I) def clean_and_nominalize_title(raw_title): """ Return (clean_problem_title, grammatical_subject_phrase) so that declarative paper titles never cause double-verb collisions, mid-sentence colons, or Title-Case artifacts when embedded in questions. """ t = re.sub(r"<[^>]+>", "", raw_title or "").strip().rstrip(".") t = re.sub(r"\s+", " ", t) # Convert leading "What drives X" / "What controls X" into "Drivers of X" / "Controls on X" t = re.sub(r"^what\s+drives\s+(?:the\s+)?", "Drivers of ", t, flags=re.I) t = re.sub(r"^what\s+controls\s+(?:the\s+)?", "Controls on ", t, flags=re.I) # Strip conversational paper-style suffixes after colon/dash t = re.sub( r"\s*[:–—-]\s*(?:a\s+key\s+to\s+understanding\s+|insights?\s+from\s+|evidence\s+from\s+|" r"a\s+case\s+study\s+(?:of|from|in)\s+|new\s+constraints?\s+(?:from|on)\s+|" r"implications?\s+for\s+|a\s+review\s+of\s+|perspectives?\s+from\s+)(.+)$", r" (\1)", t, flags=re.I, ) t = re.sub(r"\s*[:–—-]\s*a\s+review$", "", t, flags=re.I) # Strip leading gerunds like "Quantifying the ...", "Understanding the ...", "Assessing the ..." t_core = re.sub( r"^(?:quantifying|understanding|assessing|evaluating|investigating|exploring|unraveling|deciphering|probing|revisiting|constraining|characterizing|modeling|simulating)\s+(?:the\s+)?", "", t, flags=re.I, ) if len(t_core) >= 20: t = t_core[0].upper() + t_core[1:] # Replace secondary compound verbs ("and reveals", "and shows", "and indicates") t = re.sub(r"\b(?:and|which)\s+(?:reveals?|shows?|demonstrates?|indicates?|suggests?)\b", "and", t, flags=re.I) if t.endswith("?"): q_clean = t.rstrip("?").strip() subj = normalize_mid_sentence_case(q_clean[0].lower() + q_clean[1:]) return q_clean, subj for rx, title_fmt, subj_fmt in _COMPILED_DECL_MAP: m = rx.match(t) if m: a = m.group(1).strip() b = m.group(2).strip() if len(a) >= 4 and len(b) >= 4 and not _RX_BAD_DECL_A.search(a) and not _RX_BAD_DECL_B.search(b): a_low = a[0].lower() + a[1:] if not a[:2].isupper() else a b_low = b[0].lower() + b[1:] if not b[:2].isupper() else b new_title = title_fmt.format(a, b) new_subj = normalize_mid_sentence_case(subj_fmt.format(a_low, b_low)) return new_title, new_subj subj = normalize_mid_sentence_case(t) return t, subj _RX_FIRST_PERSON = re.compile( r"\b(?:we\s+|our\s+(?:study|work|paper|results|model|data|simulations|findings|approach|analysis|method|experiments|observations|measurements)|this\s+study|this\s+paper|have\s+explored|was\s+based)\b", re.I, ) _RX_POST = re.compile( r"(?:remains?|is|are|has\s+remained|have\s+remained|remain\s+to\s+be|has\s+yet\s+to\s+be)\s+" r"(?:(?:at\s+present|currently|generally|relatively|often|very|somewhat|quite|still|largely|poorly|widely|highly|mostly|badly|yet\s+to\s+be|not\s+well|not\s+fully|not\s+yet|rarely|seldom|as\s+yet|hotly|actively)\s+)*" r"(?:unclear|unknown|debated|controversial|unresolved|elusive|underconstrained|unconstrained|understood|constrained|quantified|determined|explored|documented|resolved|clear|known|open\s+question|unanswered|a\s+topic\s+of\s+debate|a\s+matter\s+of\s+debate|under\s+debate)\s*" r"(?:as\s+to\s+|regarding\s+|concerning\s+|is\s+)?" r"((?:whether|if|how|why|what|to\s+what\s+extent|which|when|where)\b.{18,240})", re.I, ) _RX_PRE = re.compile( r"(?:^|(?:however|yet|nevertheless|nonetheless|but|whilst|while|whereas|although[^,;]+,|because[^,;]+,|despite[^,;]+,|and|;\s*)\s*,?\s*)" r"([A-Za-zδΔε][^.?!;:]{10,190}?)\s+" r"(?:remains?|is|are|has\s+remained|have\s+remained|has\s+been|have\s+been|remain|continue\s+to\s+be|continues\s+to\s+be)\s+" r"(?:as\s+)?(?:(?:at\s+present|currently|generally|relatively|often|very|somewhat|quite|still|largely|poorly|widely|highly|mostly|badly|not\s+well|not\s+fully|not\s+yet|inhomogeneously|incompletely|rarely|seldom|yet\s+to\s+be|as\s+yet|hotly|actively|hence)\s+)*" r"(?:unclear|unknown|debated|controversial|unresolved|elusive|underconstrained|unconstrained|poorly\s+constrained|poorly\s+understood|not\s+well\s+understood|not\s+fully\s+understood|constrained|understood|quantified|documented|resolved|determined|lacking|open|uncertain|enigmatic|unanswered|an\s+open\s+question|a\s+fundamental\s+question|a\s+major\s+challenge|a\s+key\s+challenge|subject\s+to\s+debate|a\s+matter\s+of\s+debate|a\s+topic\s+of\s+debate|under\s+debate|in\s+debate|to\s+be\s+determined|to\s+be\s+resolved|to\s+be\s+quantified)", re.I, ) _RX_MOD = re.compile( r"\b(?:poorly\s+constrained|poorly\s+understood|poorly\s+documented|rarely\s+quantified|unresolved|long-standing\s+debate\s+(?:over|on|regarding)|fundamental\s+questions?\s+(?:on|about|regarding|related\s+to))\s+([a-zA-ZδΔ][^.?!;:]{12,140})", re.I, ) _RX_LITTLE = re.compile( r"\b(?:little\s+is\s+known\s+(?:about|regarding|on|concerning)|" r"few\s+studies\s+have\s+(?:quantified|examined|investigated|constrained|addressed|evaluated|explored)|" r"lack\s+(?:of\s+)?(?:a\s+)?(?:consensus|quantitative\s+understanding|mechanistic\s+understanding)\s+(?:on|regarding|of|about)|" r"there\s+is\s+no\s+consensus\s+(?:on|regarding|about|as\s+to)|" r"(?:open\s+questions?|major\s+uncertainties|fundamental\s+uncertainties|significant\s+uncertainties|key\s+questions?|fundamental\s+questions?)\s+(?:still\s+)?(?:remain\s+|exist\s+|persist\s+)?(?:regarding|about|on|concerning|in|related\s+to|surrounding|include)\s*[:\-]?)\s*" r"([A-Za-zδΔε][^.?!;:]{14,180})", re.I, ) _RX_CHALLENGE = re.compile( r"([A-Za-zδΔε][^.?!;:]{14,160}?)\s+(?:poses?\s+a\s+(?:major|fundamental|key|significant|critical)\s+challenge|is\s+one\s+of\s+the\s+most\s+(?:uncertain|controversial|debated|challenging)\b[^.?!;:]{0,50})", re.I, ) def extract_open_clause_from_sentence(open_sent, subj_phrase): """ Parse the open-problem sentence from the paper abstract into a structured research question core. Handles post-predicate wh-clauses, pre-predicate open subjects, contrast gaps, and direct questions. """ if not open_sent: return None, None s = re.sub(r"<[^>]+>", " ", open_sent) s = re.sub(r"^(?:Abstract|Summary|Plain\s+Language\s+Summary|Key\s+Points)\s*[:.\-]?\s*", "", s, flags=re.I) # Strip inline superscript reference numbers attached to words (e.g. "plumes5", "lithosphere4,6") s = re.sub(r"(?<=[a-zA-Z\)])\d+(?:[,\-–]\d+)*", "", s) # Normalize impersonal "our understanding of " / "our knowledge of " s = re.sub(r"\bour\s+(?:understanding|knowledge)\s+of\s+", "the mechanisms of ", s, flags=re.I) # Remove comma-bounded transitional adverbs s = re.sub(r",\s*(?:however|nevertheless|nonetheless|therefore|thus|consequently|moreover|furthermore|for\s+example|in\s+particular|in\s+contrast)\s*,", " ", s, flags=re.I) s = re.sub(r"\s+", " ", s).strip() def de_anaphorize(cl): cl = re.sub(r"^(?:however|yet|nevertheless|nonetheless|but|although|while|whereas|consequently|therefore|thus|still|nonetheless|furthermore|moreover)\s*,?\s*", "", cl, flags=re.I) cl = re.sub(r"\b(?:in\s+this\s+study|in\s+this\s+work|in\s+this\s+paper|here\s+we\s+\w+|in\s+this\s+region|in\s+this\s+area|in\s+the\s+study\s+area)\b", "", cl, flags=re.I) cl = re.sub(r"\s+\bthere\b", "", cl, flags=re.I) # If there is a comma where the preceding clause is a subordinate/introductory clause or contains a finite verb, take the final segment after the comma (unless cl starts with a WH-word) if ", " in cl and not cl.lower().startswith(("whether ", "how ", "why ", "what ", "to what extent ")): parts = [p.strip() for p in cl.split(", ") if p.strip()] if len(parts) >= 2: prefix = " ".join(parts[:-1]) if re.search( r"\b(?:although|while|whereas|despite|because|since|when|if|many|most|several|previous|studies|have|has|had|was|were|is|are|explored|investigated|documented|known|based|observed|reported|shown|found|believed|proposed|due\s+to|owing\s+to|in\s+the\s+absence)\b", prefix, flags=re.I, ): cl = parts[-1] # Replace demonstrative/possessive anaphors without duplicating head nouns already in subj_phrase def _replace_possessive(m): noun = m.group(1).strip() head_word = noun.split()[0].lower() if len(head_word) >= 4 and head_word in subj_phrase.lower(): return f"the {noun}" return f"the {noun} of {subj_phrase}" cl = re.sub( r"^\b(?:its|their|this|these|such)\s+([a-z][a-z\s\-]{3,45})\b", _replace_possessive, cl, flags=re.I, ) cl = re.sub( r"\b(?:this|these)\s+(change|process|processes|mechanism|mechanisms|transport|phenomenon|effect|effects|weakness|weaknesses|interaction|interactions|variation|variability|feature|features|anomaly|anomalies|transition|relationship|relationships)\b", lambda m: f"the {m.group(1)}", cl, flags=re.I, ) cl = re.sub(r"\s*:\s*", " — ", cl) cl = normalize_mid_sentence_case(cl) return re.sub(r"\s+", " ", cl).strip().rstrip(".,;:") # 1. Direct question in open_sentence if "?" in s: q_part = s.split("?")[0].strip() if ":" in q_part and len(q_part.split(":")[-1].strip()) > 25: q_part = q_part.split(":")[-1].strip() q_part = re.sub(r"\s*:\s*", " — ", q_part) if len(q_part) >= 28 and not _RX_FIRST_PERSON.search(q_part): return "direct_q", q_part[0].upper() + q_part[1:] + "?" # 2. Post-predicate WH-clause m_post = _RX_POST.search(s) if m_post: cl = de_anaphorize(m_post.group(1)) if len(cl) >= 20 and not _RX_FIRST_PERSON.search(cl): return "post_wh", cl # 3. Pre-predicate open subject m_pre = _RX_PRE.search(s) if m_pre: cl = de_anaphorize(m_pre.group(1)) if len(cl) >= 12 and not _RX_FIRST_PERSON.search(cl): return "pre_subj", cl # 4. Noun phrase with embedded "poorly constrained / poorly understood / unresolved" modifier m_mod = _RX_MOD.search(s) if m_mod: cl = de_anaphorize(m_mod.group(1)) if len(cl) >= 14 and not _RX_FIRST_PERSON.search(cl): return "pre_subj", cl # 5. "little is known about ...", "few studies have quantified ...", "open questions remain regarding ..." m_little = _RX_LITTLE.search(s) if m_little: cl = de_anaphorize(m_little.group(1)) if len(cl) >= 14 and not _RX_FIRST_PERSON.search(cl): if cl.lower().startswith(("whether ", "if ", "how ", "why ", "what ", "to what extent ", "which ", "when ", "where ")): return "post_wh", cl return "pre_subj", cl # 6. "... poses a major challenge ..." / "... is one of the most uncertain/controversial ..." m_chal = _RX_CHALLENGE.search(s) if m_chal: cl = de_anaphorize(m_chal.group(1)) if len(cl) >= 14 and not _RX_FIRST_PERSON.search(cl): return "pre_subj", cl return None, None def synthesize_grounded_statements(title, open_sent, abstract, sub_prof, obs_list, region, idx_in_cat): """ Synthesize (clean_title, statement, plain_statement, precise_statement, what_would_settle_it, is_grounded). Guarantees 0 mid-sentence colons, 0 Title-Case artifacts, and embeds sub-discipline governing equations in precise_statement. """ clean_title, subj = clean_and_nominalize_title(title) kind, cl = extract_open_clause_from_sentence(open_sent, subj) comp = sub_prof["components"][0].replace("_", " ") med = sub_prof["media"][0].replace("_", " ") proc0 = sub_prof["processes"][0].replace("_", " ") proc1 = sub_prof["processes"][1].replace("_", " ") obs0 = obs_list[0] obs1 = obs_list[1] if len(obs_list) > 1 else sub_prof["observables"][-1] inf0 = sub_prof["inferred"][idx_in_cat % len(sub_prof["inferred"])] forc = sub_prof["forcings"] bndry = sub_prof["boundaries"] depth = sub_prof["depth_range"] gov_eqs = GOVERNING_RELATIONS_BY_SUB_ID[sub_prof["sub_id"]] gov_eq = gov_eqs[idx_in_cat % len(gov_eqs)] if kind == "direct_q": statement = cl elif kind == "post_wh": cl_low = cl[0].lower() + cl[1:] if not cl[:2].isupper() else cl if cl_low.lower().startswith(("whether ", "if ")): body = re.sub(r"^(?:whether|if)\s+", "", cl_low, flags=re.I) statement = f"Regarding {subj}, what mechanisms determine whether {body}?" elif cl_low.lower().startswith(("how ", "why ", "what ", "which ", "when ", "where ")): subj_words = set(re.findall(r"[a-z]{4,}", subj.lower())) cl_words = set(re.findall(r"[a-z]{4,}", cl_low.lower())) if len(subj_words & cl_words) >= 2: statement = f"In {comp} systems, {cl_low}, and how is this governed by {forc}?" else: statement = f"In the context of {subj}, {cl_low}?" else: statement = f"Regarding {subj}, {cl_low} under varying {bndry}?" elif kind == "pre_subj": cl_low = cl[0].lower() + cl[1:] if not cl[:2].isupper() else cl subj_words = set(re.findall(r"[a-z]{4,}", subj.lower())) cl_words = set(re.findall(r"[a-z]{4,}", cl_low.lower())) overlap = len(subj_words & cl_words) if cl_low.lower().startswith(("how ", "why ", "what ", "whether ")): if overlap >= 2: statement = f"Within {comp} environments, what physical and chemical processes determine {cl_low}?" else: statement = f"In the study of {subj}, what mechanisms determine {cl_low}?" else: if overlap >= 2: q_patterns = [ f"What physical, chemical, and dynamical mechanisms govern {cl_low}, and how do {forc} interact with {bndry}?", f"How can {cl_low} be quantitatively constrained across {region}, and what is the relative importance of {proc0} versus {proc1}?", f"What processes control {cl_low} within the {comp}, and what thresholds govern its response to {forc}?", ] else: q_patterns = [ f"In the context of {subj}, what mechanisms govern {cl_low}, and how is it modulated by {bndry}?", f"Regarding {subj}, how do {proc0} and {forc} control {cl_low} across {region}?", f"What quantitative constraints govern {cl_low} in {subj}, and how does this resolve {inf0}?", ] statement = q_patterns[idx_in_cat % len(q_patterns)] else: sub_templates = [ f"What physical and biogeochemical mechanisms govern {subj} within the {comp}, and how do {forc} interact with {bndry}?", f"How do coupled processes of {proc0} and {proc1} in {med} control {subj} across {region}, and how can {obs0} resolve {inf0}?", f"What are the relative causal contributions of {forc} and {bndry} in controlling {subj}, and what thresholds govern {inf0}?", ] statement = sub_templates[idx_in_cat % len(sub_templates)] statement = re.sub(r"\s*:\s*", " — ", statement) statement = re.sub(r"\s+", " ", statement).strip().rstrip(".?!") + "?" if kind in ("pre_subj", "post_wh") and cl and len(cl) < 110: cl_short = cl[0].lower() + cl[1:] if not cl[:2].isupper() else cl plain_templates = [ f"What natural processes control {cl_short} in relation to {subj}?", f"How do {proc0} and environmental conditions govern {cl_short} in {subj}?", f"Why does {subj} remain difficult to predict, and what controls {cl_short} in Earth's {comp}?", ] else: plain_templates = [ f"What natural processes control {subj} in Earth's {comp}, and how does it respond to {forc}?", f"How do {proc0} and {med} properties work together to govern {subj} across {region}?", f"Why does {subj} vary across space and time, and what observations can resolve {inf0}?", ] plain_statement = re.sub(r"\s*:\s*", " — ", plain_templates[idx_in_cat % len(plain_templates)]) plain_statement = re.sub(r"\s+", " ", plain_statement).strip().rstrip(".?!") + "?" precise_statement = ( f"Within {med} of the {comp} ({depth}), how do {forc} and {bndry} interact via {proc0} " f"(governed by {gov_eq}) to control {subj}, and can {obs0} uniquely resolve {inf0}?" ) precise_statement = re.sub(r"\s*:\s*", " — ", precise_statement) precise_statement = re.sub(r"\s+", " ", precise_statement).strip().rstrip(".?!") + "?" what_would_settle_it = ( f"Co-located observations of {obs0} and {obs1} coupled with " f"process-resolving models of {proc0} to constrain {inf0}." ) return clean_title, statement, plain_statement, precise_statement, what_would_settle_it, kind is not None