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137cs 13c 14c 15n 18o 34s 87sr abruptclimatechange accuracy acidification acid_mine_drainage africa age agricultural agriculture alaska algorithm alkalinity altimetry amazon americas ammonia ammonium amphibians anavilhanas andes anthropogenic aquatic aquatox arctic arid arizona asia assessment assimilation astrobiology atacama atlantic atmosphere atmosphericco2 atmospheric_co2 atmospheric_deposition atmospherictransport attribution australia automated avhrr bacteria baltic basalt baseflow basin bayesian beipanjiang belize beni biodiversity biofuels biogeochemistry biogeography biology biomass biooptics biosphere birds blackwater bolivia boreal bosawas brazil budget burial c3 c4 calibration california camrex canada carbon carbonates carbonatesystem carbon_capture caribbean cartography catalogs cdom cenote centralamerica changjiang channel chaos chemical_erosion chesepeake chile china chlorophyll citations cities classification climate climate_change climatology clustering c_n_ratio co2 co2_enrichment coarse_woody_debris coastal collaboration collaborative_filtering collaborative_tagging community community_ecology conceptualmodels congo connectivity conservation contaminants continental controlled_vocabularies controls costa_rica crops crosssection dams danube data_management dataset decomposition deforestation degassing degradation delta dem denitrification denudation desert desorption developing_countries development diatoms dic dic13 din dip discharge disequilibrium distributed disturbance doc don dop drought dryforest dta dydoc earthref earth_science earth_system ecologicalstatus ecology economics ecosystem ecosystem_health ecosystemmodels ecosystem_services ecuador emergent emissions energy equilibration erosion esmf estuary ethanol europe eutrophication evaporites evapotranspiration evasion everglades exploration export export_coefficient face fertilizer fes2004 finland fire fisheries floodplain florida flowmap flowpaths flow_regulation folksonomy food_web forecasts forests fossil_fuel fractaldimension frames gam ganges garp gas_exchange gcm gcms genome geocarb geochemistry geodesy geoengineering geographic geographicarea geology geomorphology georeferencing geostatistics geothermal gis glacial glm gloal global gpp granite graph grasses grasslands groundwater guano guizhou gulf_of_mexico habitat han hazards headwaters hillslope himalaya historical honduras hong huanghe hudson human_impact humics hurricanes hydra hydrology hydrothermal_springs hyporreic hypoxia ibis impacts imported indigenous indonesia informatics inputs interannual intercomparison interoperability inundation inversion iowa ipcc irrigation isotopes italy japan jers jets jiulong karst keeling_plot kerogen keywords kinetics knowledge konza_prairie korea kriging kuparuk lai lakes landcover land_cover landscapeecology landscapemetrics landslides landsurface landuse land_use landusechange land_use_change lanyanghsi lateral_transfer latin_america latlong life lignings linx lis lithology lithosphere lme loicz longitudinal mackenzie macrophyte madagascar madeira madre_de_dios magdalena manacapuru mangrove marine marine_reserve maritime marsh mass_balance matter mechanistic megacities mekong mercury mestizo metabolism metadata metals metamorphic methane mexico michigan millenniumassessment mining mississippi mitigation mixing_model model model_comparison modelevaluation modelfit modeling_framework models modis moisturetransport monitoring morphology mountains ms_amz_oc_isotop nani native_american nearshore neotropics nepal network network_extraction new_orleans newzealand n_fixation nicaragua nitrate nitrogen nitrogen_budget nitrogen_fixation nitrogen_saturation north_america npp numericalmethods nutrient_limitation nutrient_ratios nutrients observations ocean oceancolor ocean_geochemistry oceania oceans oceas ontology open_data organic organicmatter orinoco outgassing oxidation oxygen ozone pacific pacific_nw paleo panama pantanal papagayo parana pasture patagonia peat pedogenesis percolation permafrost peru pesticides ph phanerozoic phosphorus photodegradation photosynthesis phytoplankton poc point_sources poland policy pollution population poverty prairie precipitation preservation primary_production pristine production productivity projections projects publication public_health puerto_rico pyrite qual2e reconstruction regeneration regional regressionmodel remotesensing research reservoirs residence_time respiration restoration review rheyssys rice rionegro riparian river river_corridor river_export rivernetwork riverplumes rivers riverstrahler riversystem river_systems river_vectors rondonia roots rovers runoff salinity salmon sampling sanitation sar scale scales scenarios sdi seagrasses search sea_salt seasonality seawifs secondaryforest sedimens sedimentation sediment_fan sediments seine sensitivity sensitivityanalysis sewage shelf siberia silica silicates size_distribution small_lakes soc society software soil_map soilorganiccarbon soil_poperties soilprofile soils soilwater soil_water sorption soteron south_america sparrow spatial_heterogeneity species_distribution sream sres srtm sst stableisotopes stalagmites stationarity stoichiometry storms stream streams strontium sub_basins subsurface sub_tropical sulfur sulphates surfacewater sustainability_science svat swat synchronization synthesis tagging taiwan taylordiagram tectonics tehuantepec temperate temperature terrain terrestrial threegorges tibet tide time_scales time_series toc topography trace_metals tracers transpiration trends trophic_state tropical tropicalforests troposphere tss turbidity typology ucayali uk uncertainty unprojected upwelling uranium urbanization usa usgs validation vegetation vietnam vilcanota visualization volcanic waikato water water_management water_quality watershed watersheds water_treatment_plant weathering web web_services wetlands winds wisconsin wood yangtze yellow_river yucatan yukon zhujiang