![NASA/GEOS-CF/v2/fcst/tavg1hr](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_GEOS-CF_v2_fcst_tavg1hr_sample.png) Dataset Availability : 2025-08-04T00:00:00Z--2026-11-12T09:00:00Z Dataset Producer : [NASA / GMAO](https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) Tags : [atmosphere](https://developers.google.com/earth-engine/datasets/tags/atmosphere.md.txt) [composition](https://developers.google.com/earth-engine/datasets/tags/composition.md.txt) [forecast](https://developers.google.com/earth-engine/datasets/tags/forecast.md.txt) [geos](https://developers.google.com/earth-engine/datasets/tags/geos.md.txt) [geos-cf](https://developers.google.com/earth-engine/datasets/tags/geos-cf.md.txt) [gmao](https://developers.google.com/earth-engine/datasets/tags/gmao.md.txt) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa.md.txt) #### Description This dataset contains forecast (fcst) of time-averaged frequency data (tavg1hr). It is built by merging the original GEOS-CF collections chm_tavg_1hr_glo_L1440x721_slv, met_tavg_1hr_glo_L1440x721_slv, and xgc_tavg_1hr_glo_L1440x721_slv. Use the 'creation_time' and 'forecast_time' properties to select data of interest. The Goddard Earth Observing System Composition Forecast (GEOS-CF) system is a global constituent prediction system from NASA's [Global Modeling and Assimilation Office(GMAO)](https://gmao.gsfc.nasa.gov/). GEOS-CF offers a tool for atmospheric chemistry research, with the goal to supplement NASA's broad range of space-based and in-situ observations. GEOS-CF expands on the GEOS weather and aerosol modeling system by introducing the [GEOS-Chem](http://wiki.seas.harvard.edu/geos-chem/) chemistry module to provide hindcasts and 5-days forecasts of atmospheric constituents including ozone (O~3~), carbon monoxide (CO), nitrogen dioxide (NO~2~), sulfur dioxide (SO~2~), coarse particulate matter (PM~10~), and fine particulate matter (PM~2.5~). The chemistry module integrated in GEOS-CF is identical to the offline GEOS-Chem model and readily benefits from the innovations provided by the GEOS-Chem community. Outputs are provided globally at 0.25° horizontal resolution. Please refer to the [GEOS-CF Product Page](https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) for more details. In October 2025, a major update to the GEOS-CF system was introduced as GEOS-CF v2. This change included updates to the GEOS atmospheric general circulation model and the GEOS-Chem chemical model, replaying meteorology to [GEOS IT](https://gmao.gsfc.nasa.gov/gmao-products/geos-it/), direct assimilation of stratospheric profiles and column ozone from NASA Aura OMI and MLS instruments, and updates to the anthropogenic emission source. Evaluation of these updates is ongoing; results will be added into this description as they become available. [Preliminary results](https://gmao.gsfc.nasa.gov/science-snapshots/improved-atmospheric-composition-forecasting-in-geos-cf-version-2/) suggest that, in relation to GEOS-CF v1, GEOS-CF v2 dramatically improves the representation of PM~2.5~ and SO~2~ near the surface. Representations of O~3~ and NO~2~ are generally improved throughout most of the atmospheric column, with and NO~2~ being substantially lower in GEOS-CF v2 compared with v1. While representation of near-surface O~3~ is improved compared to GEOS-CF v1, there remain high biases compared with ozone monitor data from the US Environmental Protection Agency. Users of GEOS-CF are encouraged to treat outputs from the original system (v1) and the new system (v2) separately in their analysis, due to the extensive changes between the systems. ### Bands **Bands** Pixel size: 27750 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---| | `ACET` | Mol fraction | 27750 meters | Acetone (CH3C(O)CH3, MW=58.09 g mol-1) mole fraction in dry air | | `ALD2` | Mol fraction | 27750 meters | Acetaldehyde (CH3CHO, MW=44.06 g mol-1) mole fraction in dry air | | `ALK4` | Mol fraction | 27750 meters | Lumped \>= C4 Alkanes (MW=58.12 g mol-1) mole fraction in dry air | | `AOD550_BC` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of black carbon aerosols | | `AOD550_DUST` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of dust aerosols | | `AOD550_OC` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of organic aerosols | | `AOD550_PSC` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of polar stratospheric cloud | | `AOD550_SLA` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of stratospheric liquid aerosols | | `AOD550_SNA` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of sulfate-nitrate-ammonium aerosols | | `AOD550_SS` | Dimensionless | 27750 meters | Aerosol optical depth at 550 nm of sea salt aerosols | | `BCPI` | Mol fraction | 27750 meters | Hydrophilic black carbon aerosol (C, MW=12.01 g mol-1) mole fraction in dry air | | `BCPO` | Mol fraction | 27750 meters | Hydrophobic black carbon aerosol (C, MW=12.01 g mol-1) mole fraction in dry air | | `BENZ` | Mol fraction | 27750 meters | Benzene (C6H6, MW=78.12 g mol-1) mole fraction in dry air | | `C2H6` | Mol fraction | 27750 meters | Ethane (C2H6, MW=30.08 g mol-1) mole fraction in dry air | | `C3H8` | Mol fraction | 27750 meters | Propane (C3H8, MW=44.11 g mol-1) mole fraction in dry air | | `CLDTT` | Dimensionless | 27750 meters | Total cloud area fraction | | `CO` | Mol fraction | 27750 meters | Carbon monoxide (CO, MW=28.01 g mol-1) mole fraction in dry air | | `COSZ` | Dimensionless | 27750 meters | Cosine of the solar zenith angle | | `DST1` | Mol fraction | 27750 meters | Dust aerosol; Reff = 0.7 microns (MW=29.0 g mol-1) mole fraction in dry air | | `DST2` | Mol fraction | 27750 meters | Dust aerosol; Reff = 1.4 microns (MW=29.0 g mol-1) mole fraction in dry air | | `DST3` | Mol fraction | 27750 meters | Dust aerosol; Reff = 2.4 microns (MW=29.0 g mol-1) mole fraction in dry air | | `DST4` | Mol fraction | 27750 meters | Dust aerosol; Reff = 4.5 microns (MW=29.0 g mol-1) mole fraction in dry air | | `EMIS_ACET` | kg/m\^2/s | 27750 meters | Acetone total emission mass flux | | `EMIS_ACET_ANTH` | kg/m\^2/s | 27750 meters | Acetone industry emission mass flux | | `EMIS_ACET_BB` | kg/m\^2/s | 27750 meters | Acetone biomass burning emission mass flux | | `EMIS_ACET_BG` | kg/m\^2/s | 27750 meters | Acetone biogenic emission mass flux | | `EMIS_ACET_OC` | kg/m\^2/s | 27750 meters | Acetone ocean emission mass flux | | `EMIS_ALD2` | kg/m\^2/s | 27750 meters | Acetaldehyde total emission mass flux | | `EMIS_ALD2_ANTH` | kg/m\^2/s | 27750 meters | Acetaldehyde industry emission mass flux | | `EMIS_ALD2_BB` | kg/m\^2/s | 27750 meters | Acetaldehyde biomass burning emission mass flux | | `EMIS_ALD2_BG` | kg/m\^2/s | 27750 meters | Acetaldehyde biogenic emission mass flux | | `EMIS_ALD2_OC` | kg/m\^2/s | 27750 meters | Acetaldehyde ocean emission mass flux | | `EMIS_ALK4` | kg/m\^2/s | 27750 meters | Lumped alkanes c4 and higher total emission mass flux | | `EMIS_ALK4_ANTH` | kg/m\^2/s | 27750 meters | Lumped alkanes c4 and higher industry emission mass flux | | `EMIS_ALK4_BB` | kg/m\^2/s | 27750 meters | Lumped alkanes c4 and higher biomass burning emission mass flux | | `EMIS_BCPI` | kg/m\^2/s | 27750 meters | Hydrophilic black carbon total emission mass flux | | `EMIS_BCPI_ANTH` | kg/m\^2/s | 27750 meters | Hydrophilic black carbon industry emission mass flux | | `EMIS_BCPI_BB` | kg/m\^2/s | 27750 meters | Hydrophilic black carbon biomass emission mass flux | | `EMIS_BCPO` | kg/m\^2/s | 27750 meters | Hydrophobic black carbon total emission mass flux | | `EMIS_BCPO_ANTH` | kg/m\^2/s | 27750 meters | Hydrophobic black carbon industry emission mass flux | | `EMIS_BCPO_BB` | kg/m\^2/s | 27750 meters | Hydrophobic black carbon biomass emission mass flux | | `EMIS_BENZ` | kg/m\^2/s | 27750 meters | Benzene total emission mass flux | | `EMIS_C2H6` | kg/m\^2/s | 27750 meters | Ethane total emission mass flux | | `EMIS_C2H6_ANTH` | kg/m\^2/s | 27750 meters | Ethane industry emission mass flux | | `EMIS_C2H6_BB` | kg/m\^2/s | 27750 meters | Ethane biomass burning emission mass flux | | `EMIS_C3H8` | kg/m\^2/s | 27750 meters | Propane total emission mass flux | | `EMIS_C3H8_ANTH` | kg/m\^2/s | 27750 meters | Propane industry emission mass flux | | `EMIS_C3H8_BB` | kg/m\^2/s | 27750 meters | Propane biomass burning emission mass flux | | `EMIS_CH2Br2` | kg/m\^2/s | 27750 meters | Dibromomethane total emission mass flux | | `EMIS_CH2I2` | kg/m\^2/s | 27750 meters | Diiodomethane total emission mass flux | | `EMIS_CH2IBr` | kg/m\^2/s | 27750 meters | Bromoiodomethane total emission mass flux | | `EMIS_CH2ICl` | kg/m\^2/s | 27750 meters | Chloroiodomethane total emission mass flux | | `EMIS_CH3I` | kg/m\^2/s | 27750 meters | Methyl iodide total emission mass flux | | `EMIS_CHBr3` | kg/m\^2/s | 27750 meters | Bromoform total emission mass flux | | `EMIS_CO` | kg/m\^2/s | 27750 meters | Carbon monoxide total emission mass flux | | `EMIS_CO_AGR` | kg/m\^2/s | 27750 meters | Carbon monoxide agriculture emission mass flux | | `EMIS_CO_ANTH` | kg/m\^2/s | 27750 meters | Carbon monoxide industry emission mass flux | | `EMIS_CO_BB` | kg/m\^2/s | 27750 meters | Carbon monoxide biomass emission mass flux | | `EMIS_CO_BG` | kg/m\^2/s | 27750 meters | Carbon monoxide biogenic emission mass flux | | `EMIS_CO_SHIP` | kg/m\^2/s | 27750 meters | Carbon monoxide ship emission mass flux | | `EMIS_DMS` | kg/m\^2/s | 27750 meters | Dimethyl sulfide total emission mass flux | | `EMIS_DST1` | kg/m\^2/s | 27750 meters | Dust aerosol 0.7 microns emission mass flux | | `EMIS_DST2` | kg/m\^2/s | 27750 meters | Dust aerosol 1.4 microns emission mass flux | | `EMIS_DST3` | kg/m\^2/s | 27750 meters | Dust aerosol 2.4 microns emission mass flux | | `EMIS_DST4` | kg/m\^2/s | 27750 meters | Dust aerosol 4.5 microns emission mass flux | | `EMIS_EOH` | kg/m\^2/s | 27750 meters | Ethanol total emission mass flux | | `EMIS_EOH_ANTH` | kg/m\^2/s | 27750 meters | Ethanol industry emission mass flux | | `EMIS_EOH_BG` | kg/m\^2/s | 27750 meters | Ethanol biogenic emission mass flux | | `EMIS_HCHO` | kg/m\^2/s | 27750 meters | Formaldehyde total emission mass flux | | `EMIS_HCHO_ANTH` | kg/m\^2/s | 27750 meters | Formaldehyde industry emission mass flux | | `EMIS_HCHO_BB` | kg/m\^2/s | 27750 meters | Formaldehyde biomass burning emission mass flux | | `EMIS_HCOOH` | kg/m\^2/s | 27750 meters | Formic acid total emission mass flux | | `EMIS_HNO2` | kg/m\^2/s | 27750 meters | Nitrous acid total emission mass flux | | `EMIS_HOI` | kg/m\^2/s | 27750 meters | Hypoiodous acid total emission mass flux | | `EMIS_I2` | kg/m\^2/s | 27750 meters | Molecular iodine total emission mass flux | | `EMIS_ISOP` | kg/m\^2/s | 27750 meters | Isoprene total emission mass flux | | `EMIS_LIMO_BG` | kg/m\^2/s | 27750 meters | LIMO biogenic emission mass flux | | `EMIS_MEK` | kg/m\^2/s | 27750 meters | Methyl ethyl ketone total emission mass flux | | `EMIS_MEK_ANTH` | kg/m\^2/s | 27750 meters | Methyl ethyl ketone industry emission mass flux | | `EMIS_MEK_BB` | kg/m\^2/s | 27750 meters | Methyl ethyl ketone biomass burning emission mass flux | | `EMIS_MTPA_BG` | kg/m\^2/s | 27750 meters | MTPA biogenic emission mass flux | | `EMIS_MTPO_BG` | kg/m\^2/s | 27750 meters | MTPO biogenic emission mass flux | | `EMIS_NH3` | kg/m\^2/s | 27750 meters | Ammonia total emission mass flux | | `EMIS_NH3_AGR` | kg/m\^2/s | 27750 meters | Ammonia agriculture emission mass flux | | `EMIS_NH3_ANTH` | kg/m\^2/s | 27750 meters | Ammonia industry emission mass flux | | `EMIS_NH3_BB` | kg/m\^2/s | 27750 meters | Ammonia biomass burning emission mass flux | | `EMIS_NO` | kg/m\^2/s | 27750 meters | Nitric oxide total emission mass flux | | `EMIS_NO2` | kg/m\^2/s | 27750 meters | Nitrogen dioxide total emission mass flux | | `EMIS_NO2_AGR` | kg/m\^2/s | 27750 meters | Nitrogen dioxide agriculture emission mass flux | | `EMIS_NO2_ANTH` | kg/m\^2/s | 27750 meters | Nitrogen dioxide industry emission mass flux | | `EMIS_NO2_BB` | kg/m\^2/s | 27750 meters | Nitrogen dioxide biomass emission mass flux | | `EMIS_NO2_SHIP` | kg/m\^2/s | 27750 meters | Nitrogen dioxide ship emission mass flux | | `EMIS_NO_AGR` | kg/m\^2/s | 27750 meters | Nitric oxide agriculture emission mass flux | | `EMIS_NO_ANTH` | kg/m\^2/s | 27750 meters | Nitric oxide industry emission mass flux | | `EMIS_NO_BB` | kg/m\^2/s | 27750 meters | Nitric oxide biomass emission mass flux | | `EMIS_NO_LGHT` | kg/m\^2/s | 27750 meters | Nitric oxide lightning emission mass flux | | `EMIS_NO_SHIP` | kg/m\^2/s | 27750 meters | Nitric oxide ship emission mass flux | | `EMIS_NO_SOIL` | kg/m\^2/s | 27750 meters | Nitric oxide soil emission mass flux | | `EMIS_OCPI` | kg/m\^2/s | 27750 meters | Hydrophilic organic carbon total emission mass flux | | `EMIS_OCPI_ANTH` | kg/m\^2/s | 27750 meters | Hydrophilic organic carbon industry emission mass flux | | `EMIS_OCPI_BB` | kg/m\^2/s | 27750 meters | Hydrophilic organic carbon biomass emission mass flux | | `EMIS_OCPO` | kg/m\^2/s | 27750 meters | Hydrophobic organic carbon total emission mass flux | | `EMIS_OCPO_ANTH` | kg/m\^2/s | 27750 meters | Hydrophobic organic carbon industry emission mass flux | | `EMIS_OCPO_BB` | kg/m\^2/s | 27750 meters | Hydrophobic organic carbon biomass emission mass flux | | `EMIS_PRPE` | kg/m\^2/s | 27750 meters | Lumped alkenes c3 and higher total emission mass flux | | `EMIS_PRPE_ANTH` | kg/m\^2/s | 27750 meters | Lumped alkenes c3 and higher industry emission mass flux | | `EMIS_PRPE_BB` | kg/m\^2/s | 27750 meters | Lumped alkenes c3 and higher biomass burning emission mass flux | | `EMIS_PRPE_BG` | kg/m\^2/s | 27750 meters | Lumped alkenes c3 and higher biogenic emission mass flux | | `EMIS_SALA` | kg/m\^2/s | 27750 meters | Sea-salt aerosol accumulation mode 0.01-0.05 microns total emission mass flux | | `EMIS_SALC` | kg/m\^2/s | 27750 meters | Sea-salt aerosol coarse mode 0.5-8 microns total emission mass flux | | `EMIS_SESQ_BG` | kg/m\^2/s | 27750 meters | SESQ biogenic emission mass flux | | `EMIS_SO2` | kg/m\^2/s | 27750 meters | Sulfur dioxide total emission mass flux | | `EMIS_SO2_ANTH` | kg/m\^2/s | 27750 meters | Sulfur dioxide industry emission mass flux | | `EMIS_SO2_BB` | kg/m\^2/s | 27750 meters | Sulfur dioxide biomass emission mass flux | | `EMIS_SO2_SHIP` | kg/m\^2/s | 27750 meters | Sulfur dioxide ship emission mass flux | | `EMIS_SO2_VOLC` | kg/m\^2/s | 27750 meters | Sulfur dioxide eruptive volcano emission mass flux | | `EMIS_SO4` | kg/m\^2/s | 27750 meters | Sulfate total emission mass flux | | `EMIS_SO4_ANTH` | kg/m\^2/s | 27750 meters | Sulfate industry emission mass flux | | `EMIS_SO4_BB` | kg/m\^2/s | 27750 meters | Sulfate biomass emission mass flux | | `EMIS_SO4_SHIP` | kg/m\^2/s | 27750 meters | Sulfate ship emission mass flux | | `EMIS_SO4_VOLC` | kg/m\^2/s | 27750 meters | Sulfate eruptive volcano emission mass flux | | `EMIS_SOAP` | kg/m\^2/s | 27750 meters | SOA precursor total emission mass flux | | `EMIS_SOAP_ANTH` | kg/m\^2/s | 27750 meters | SOA precursor industry emission mass flux | | `EMIS_SOAP_BG` | kg/m\^2/s | 27750 meters | SOA precursor biogenic emission mass flux | | `EMIS_SOAS` | kg/m\^2/s | 27750 meters | SOA simple total emission mass flux | | `EMIS_SOAS_BG` | kg/m\^2/s | 27750 meters | SOA simple biogenic emission mass flux | | `EMIS_TOLU` | kg/m\^2/s | 27750 meters | Toluene total emission mass flux | | `EMIS_XYLE` | kg/m\^2/s | 27750 meters | Xylene total emission mass flux | | `EMIS_pFe` | kg/m\^2/s | 27750 meters | Anthropogenic iron total emission mass flux | | `EOH` | Mol fraction | 27750 meters | Ethanol (C2H5OH, MW=46.07 g mol-1) mole fraction in dry air | | `FLASHRATE` | km\^-2 s\^-1 | 27750 meters | Lightning flash rate for GEOS-Chem | | `H2O2` | Mol fraction | 27750 meters | Hydrogen peroxide (H2O2, MW=34.02 g mol-1) mole fraction in dry air | | `HCHO` | Mol fraction | 27750 meters | Formaldehyde (CH2O, MW=30.03 g mol-1) mole fraction in dry air | | `HNO3` | Mol fraction | 27750 meters | Nitric acid (HNO3, MW=63.01 g mol-1) mole fraction in dry air | | `HNO4` | Mol fraction | 27750 meters | Peroxynitric acid (HNO4, MW=79.01 g mol-1) mole fraction in dry air | | `ISOP` | Mol fraction | 27750 meters | Isoprene (CH2=C(CH3)CH=CH2, MW=68.13 g mol-1) mole fraction in dry air | | `MACR` | Mol fraction | 27750 meters | Methacrolein (CH2=C(CH3)CHO, MW=70.1 g mol-1) mole fraction in dry air | | `MEK` | Mol fraction | 27750 meters | Methyl Ethyl Ketone (RC(O)R, MW=72.11 g mol-1) mole fraction in dry air | | `MVK` | Mol fraction | 27750 meters | Methyl vinyl ketone (CH2=CHC(=O)CH3, MW=70.09 g mol-1) mole fraction in dry air | | `N2O5` | Mol fraction | 27750 meters | Dinitrogen pentoxide (N2O5, MW=108.02 g mol-1) mole fraction in dry air | | `NH3` | Mol fraction | 27750 meters | Ammonia (NH3, MW=17.04 g mol-1) mole fraction in dry air | | `NH4` | Mol fraction | 27750 meters | Ammonium (NH4, MW=18.05 g mol-1) mole fraction in dry air | | `NIT` | Mol fraction | 27750 meters | Inorganic nitrates (MW=62.01 g mol-1) mole fraction in dry air | | `NO` | Mol fraction | 27750 meters | Nitrogen oxide (NO, MW=30.01 g mol-1) mole fraction in dry air | | `NO2` | Mol fraction | 27750 meters | Nitrogen dioxide (NO2, MW=46.01 g mol-1) mole fraction in dry air | | `NOy` | Mol fraction | 27750 meters | Total reactive oxidized nitrogen (gas+aerosol) mole fraction in dry air | | `O3` | Mol fraction | 27750 meters | Ozone (O3, MW=48.0 g mol-1) mole fraction in dry air | | `OCPI` | Mol fraction | 27750 meters | Hydrophilic organic carbon aerosol (MW=12.01 g mol-1) mole fraction in dry air | | `OCPO` | Mol fraction | 27750 meters | Hydrophobic organic carbon aerosol (MW=12.01 g mol-1) mole fraction in dry air | | `PAN` | Mol fraction | 27750 meters | Peroxyacetyl nitrate (CH3C(O)OONO2, MW=121.06 g mol-1) mole fraction in dry air | | `PBLCol_NO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Boundary layer column density of nitrogen dioxide (MW=46.01 g mol-1) | | `PBLCol_O3` | 1.0e15 molecules/cm\^2 | 27750 meters | Boundary layer column density of ozone (MW=48.0 g mol-1) | | `PBLCol_SO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Boundary layer column density of sulfur dioxide (MW=64.04 g mol-1) | | `PHIS` | m\^2/s\^2 | 27750 meters | Surface geopotential height | | `PM10_RH35` | μg/m³ | 27750 meters | Particulate matter with diameter less than 10 um mass at RH 35% (includes water) mass concentration in dry air | | `PM25_RH35` | μg/m³ | 27750 meters | Particulate matter with diameter less than 2.5 um mass at RH 35% (includes water) mass concentration in dry air | | `PM25bc_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from black carbon mass concentration in dry air | | `PM25du_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from dust mass concentration in dry air | | `PM25nit_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from nitrate (includes water) mass concentration in dry air | | `PM25nh4_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from ammonium (includes water) mass concentration in dry air | | `PM25oc_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from primary organic aerosols (includes water) mass concentration in dry air | | `PM25soa_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from secondary organic aerosols (includes water) mass concentration in dry air | | `PM25ss_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from sea salt aerosols (includes water) mass concentration in dry air | | `PM25su_RH35` | μg/m³ | 27750 meters | PM2.5 mass at RH 35% from sulfates (includes water) mass concentration in dry air | | `PRPE` | Mol fraction | 27750 meters | Lumped \>= C3 alkenes (C3H6, MW=42.09 g mol-1) mole fraction in dry air | | `PS` | Pa | 27750 meters | Surface pressure | | `Q` | Mass fraction | 27750 meters | Specific humidity | | `RCHO` | Mol fraction | 27750 meters | Lumped aldehyde \>= C3 (CH3CH2CHO, MW=58.09 g mol-1) mole fraction in dry air | | `RH` | Dimensionless | 27750 meters | Relative humidity after moist | | `SALA` | Mol fraction | 27750 meters | Fine (0.01-0.05 microns) sea salt aerosol (MW=31.4 g mol-1) mole fraction in dry air | | `SALC` | Mol fraction | 27750 meters | Coarse (0.5-8 microns) sea salt aerosol (MW=31.4 g mol-1) mole fraction in dry air | | `SLP` | Pa | 27750 meters | Sea level pressure | | `SO2` | Mol fraction | 27750 meters | Sulfur dioxide (SO2, MW=64.04 g mol-1) mole fraction in dry air | | `SOAP` | Mol fraction | 27750 meters | SOA Precursor - lumped species for simplified SOA parameterization (MW=150.0 g mol-1) mole fraction in dry air | | `SOAS` | Mol fraction | 27750 meters | SOA Simple - simplified non-volatile SOA parameterization (MW=150.0 g mol-1) mole fraction in dry air | | `T` | K | 27750 meters | Air temperature | | `TOLU` | Mol fraction | 27750 meters | Toluene (C7H8, MW=92.15 g mol-1) mole fraction in dry air | | `TotCol_BrO` | 1.0e15 molecules/cm\^2 | 27750 meters | Total column density of bromine monoxide (MW=95.9 g mol-1) | | `TotCol_CO` | 1.0e15 molecules/cm\^2 | 27750 meters | Total column density of carbon monoxide (MW=28.01 g mol-1) | | `TotCol_IO` | 1.0e15 molecules/cm\^2 | 27750 meters | Total column density of iodine monoxide (MW=206.9 g mol-1) | | `TotCol_NO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Total column density of nitrogen dioxide (MW=46.01 g mol-1) | | `TotCol_O3` | Dobson | 27750 meters | Total column density of ozone (MW=48.0 g mol-1) | | `TotCol_SO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Total column density of SO2 sulfur dioxide (MW=64.04 g mol-1) | | `TPREC` | kg/m\^2/s | 27750 meters | Total precipitation | | `TropCol_BrO` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of bromine monoxide (MW=95.9 g mol-1) | | `TropCol_CO` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of carbon monoxide (MW=28.01 g mol-1) | | `TropCol_GLYX` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of glyoxal (MW=58.04 g mol-1) | | `TropCol_HCHO` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of formaldehyde (MW=30.03 g mol-1) | | `TropCol_HCOOH` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of formic acid (MW=46.03 g mol-1) | | `TropCol_IO` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of iodine monoxide (MW=206.9 g mol-1) | | `TropCol_ISOP` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of isoprene (MW=100.13 g mol-1) | | `TropCol_NH3` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of ammonia (MW=17.04 g mol-1) | | `TropCol_NO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of nitrogen dioxide (MW=46.01 g mol-1) | | `TropCol_O3` | Dobson | 27750 meters | Tropospheric column density of ozone (MW=48.0 g mol-1) | | `TropCol_PAN` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of peroxyacetyl nitrate (MW=121.06 g mol-1) | | `TropCol_SO2` | 1.0e15 molecules/cm\^2 | 27750 meters | Tropospheric column density of sulfur dioxide (MW=64.04 g mol-1) | | `TROPPB` | Pa | 27750 meters | Tropopause pressure based on blended estimate | | `TS` | K | 27750 meters | Surface skin temperature | | `U` | m/s | 27750 meters | Eastward wind | | `V` | m/s | 27750 meters | Northward wind | | `XYLE` | Mol fraction | 27750 meters | Xylene (C8H10, MW=106.18 g mol-1) mole fraction in dry air | | `ZL` | m | 27750 meters | Mid layer heights | | `ZPBL` | m | 27750 meters | Planetary boundary layer height | ### Image Properties **Image Properties** | Name | Type | Description | |---|---|---| | creation_time | DOUBLE | Time of creation | | forecast_time | DOUBLE | Forecast time | ### Terms of Use **Terms of Use** Unless otherwise noted, all NASA-produced data may be used for any purpose without prior permission. For more information and exceptions visit the [NASA Data \& Information Policy page](https://earthdata.nasa.gov/collaborate/open-data-services-and-software/data-information-policy). ### Citations Citations: - Keller, C. A., Knowland, K. E., Duncan, B. N., Liu, J., Anderson, D. C., Das, S., ... \& Pawson, S. (2021). Description of the NASA GEOS composition forecast modeling system GEOS-CF v1.0. Journal of Advances in Modeling Earth Systems, 13(4), e2020MS002413. [doi:10.1029/2020MS002413](https://doi.org/10.1029/2020MS002413) Knowland, K. E., Keller, C. A., Wales, P. A., Wargan, K., Coy, L., Johnson, M.S., ... \& Pawson, S. (2022). NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0: Stratospheric Composition. Journal of Advances in Modeling Earth Systems, 14, e2021MS002852. [doi:10.1029/2021MS002852](https://doi.org/10.1029/2021MS002852) > [!NOTE] > **Note:** these citations refer to the original GEOS-CF (v1) system; citations describing the new (v2) system will be added following publication. ### DOIs - ### Explore with Earth Engine > [!NOTE] > **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) ### Code Editor (JavaScript) ```javascript var imageVisParamNO2 = { 'bands': ['NO2'], 'min': 6.96e-11, 'max': 4.42e-8, }; var imageVisParamT = { 'bands': ['T'], 'min': 220, 'max': 320, 'palette': ['d7191c', 'fdae61', 'ffffbf', 'abd9e9', '2c7bb6'], }; var geosCf = ee.ImageCollection('NASA/GEOS-CF/v2/fcst/tavg1hr'); Map.setCenter(100, 20, 3); var weeklyT = geosCf.select('T').filterDate('2025-08-04', '2025-08-11').median(); Map.addLayer(weeklyT, imageVisParamT, 'Weekly T', false, 1); var NO2 = ee.Image('NASA/GEOS-CF/v2/fcst/tavg1hr/20260101_09z-20260101_1030z'); Map.addLayer(NO2, imageVisParamNO2, 'NO2', true, 1); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GEOS-CF_v2_fcst_tavg1hr) [GEOS-CF fcst tavg1hr v2: Goddard Earth Observing System Composition Forecast](https://developers.google.com/earth-engine/datasets/catalog/NASA_GEOS-CF_v2_fcst_tavg1hr.md.txt) This dataset contains forecast (fcst) of time-averaged frequency data (tavg1hr). It is built by merging the original GEOS-CF collections chm_tavg_1hr_glo_L1440x721_slv, met_tavg_1hr_glo_L1440x721_slv, and xgc_tavg_1hr_glo_L1440x721_slv. Use the 'creation_time' and 'forecast_time' properties to select data of interest. The Goddard Earth Observing System Composition Forecast (GEOS-CF) system is a global constituent prediction system from ... NASA/GEOS-CF/v2/fcst/tavg1hr, atmosphere,composition,forecast,geos,geos-cf,gmao,nasa 2025-08-04T00:00:00Z/2026-11-12T09:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.1029/2020MS002413](https://doi.org/https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) - [https://doi.org/10.1029/2020MS002413](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GEOS-CF_v2_fcst_tavg1hr)