GEOS-CF fcst tavg1hr v1: Goddard Earth Observing System Composition Forecast

NASA/GEOS-CF/v1/fcst/tavg1hr
Dataset Availability
2022-10-01T00:00:00Z–2024-12-21T12:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GEOS-CF/v1/fcst/tavg1hr")

Description

This dataset contains meteorological forecast (fcst) of time-averaged frequency data (tavg1hr). 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 high-resolution (0.25°) global constituent prediction system from NASA's Global Modeling and Assimilation Office(GMAO).

GEOS-CF offers a new 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 chemistry module to provide hindcasts and 5-days forecasts of atmospheric constituents including ozone (O3), carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), and fine particulate matter (PM2.5). 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.

Evaluation of GEOS-CF against satellite, ozonesonde, and surface observations for years 2018–2019 shows realistic simulated concentrations of O3, NO2, and CO, with normalized mean biases of −0.1 to 0.3, normalized root mean square errors between 0.1–0.4, and correlations between 0.3–0.8. Comparisons against surface observations highlight the successful representation of air pollutants in many regions of the world and during all seasons, yet also highlight current limitations, such as a global high bias in SO2 and an overprediction of summertime O3 over the Southeast United States.

GEOS-CF v1.0 generally overestimates aerosols by 20%–50% due to known issues in GEOS-Chem v12.0.1 that have been addressed in later versions. The 5-days forecasts have skill scores comparable to the 1-day hindcast. Model skills can be improved significantly by applying a bias-correction to the surface model output using a machine-learning approach.

Bands

Resolution
27750 meters

Bands

Name Units Description
ACET Mol fraction

Acetone (CH3C(O)CH3, MW = 58.08 g mol-1) volume mixing ratio dry air
ALD2 Mol fraction

Acetaldehyde (CH3CHO, MW = 44.05 g mol-1) volume mixing ratio dry air
ALK4 Mol fraction

Lumped >= C4 Alkanes (MW = 58.12 g mol-1) volume mixing ratio dry air
AOD550_BC

Black carbon optical depth at 550nm
AOD550_CLOUD

Cloud optical depth
AOD550_DST1

Dust bin1 optical depth at 550nm
AOD550_DST2

Dust bin2 optical depth at 550nm
AOD550_DST3

Dust bin3 optical depth at 550nm
AOD550_DST4

Dust bin4 optical depth at 550nm
AOD550_DST5

Dust bin5 optical depth at 550nm
AOD550_DST6

Dust bin6 optical depth at 550nm
AOD550_DST7

Dust bin7 optical depth at 550nm
AOD550_DUST

Dust optical depth at 550nm
AOD550_OC

Organic carbon optical depth at 550nm
AOD550_SALA

Accumulation mode sea salt optical depth at 550nm
AOD550_SALC

Coarse mode sea salt optical depth at 550nm
AOD550_SULFATE

Sulfate optical depth at 550nm
BCPI Mol fraction

Hydrophilic black carbon aerosol (MW = 12.01 g mol-1) volume mixing ratio dry air
BCPO Mol fraction

Hydrophobic black carbon aerosol (MW = 12.01 g mol-1) volume mixing ratio dry air
BENZ Mol fraction

Benzene (C6H6, MW = 78.11 g mol-1) volume mixing ratio dry air
C2H6 Mol fraction

Ethane (C2H6, MW = 30.07 g mol-1) volume mixing ratio dry air
C3H8 Mol fraction

Propane (C3H8, MW = 44.10 g mol-1) volume mixing ratio dry air
CH4 Mol fraction

Methane (CH4, MW = 16.00 g mol-1) volume mixing ratio dry air
CLDTT

Total cloud area fraction
CO Mol fraction

Carbon monoxide (CO, MW = 28.00 g mol-1) volume mixing ratio dry air
DRYDEPFLX_BCPI molec cm-2 s-1

Hydrophilic black carbon aerosol (MW = 12.01 g mol-1) dry deposition flux
DRYDEPFLX_BCPO molec cm-2 s-1

Hydrophobic black carbon aerosol (MW = 12.01 g mol-1) dry deposition flux
DRYDEPFLX_DST1 molec cm-2 s-1

Dust aerosol, Reff = 0.7 microns (MW = 29.00 g mol-1) dry deposition flux
DRYDEPFLX_DST2 molec cm-2 s-1

Dust aerosol, Reff = 1.4 microns (MW = 29.00 g mol-1) dry deposition flux
DRYDEPFLX_DST3 molec cm-2 s-1

Dust aerosol, Reff = 2.4 microns (MW = 29.00 g mol-1) dry deposition flux
DRYDEPFLX_DST4 molec cm-2 s-1

Dust aerosol, Reff = 4.5 microns (MW = 29.00 g mol-1) dry deposition flux
DRYDEPFLX_HCHO molec cm-2 s-1

Formaldehyde (CH2O, MW = 30.00 g mol-1) dry deposition flux
DRYDEPFLX_HNO3 molec cm-2 s-1

Nitric acid (HNO3, MW = 63.00 g mol-1) dry deposition flux
DRYDEPFLX_NH3 molec cm-2 s-1

Ammonia (NH3, MW = 17.00 g mol-1) dry deposition flux
DRYDEPFLX_NH4 molec cm-2 s-1

Ammonium (NH4, MW = 18.00 g mol-1) dry deposition flux
DRYDEPFLX_NIT molec cm-2 s-1

Inorganic nitrates (MW = 62.00 g mol-1) dry deposition flux
DRYDEPFLX_NO2 molec cm-2 s-1

Nitrogen dioxide (NO2, MW = 46.00 g mol-1) dry deposition flux
DRYDEPFLX_O3 molec cm-2 s-1

Ozone (O3, MW = 48.00 g mol-1) dry deposition flux
DRYDEPFLX_OCPI molec cm-2 s-1

Hydrophilic organic carbon aerosol (MW = 12.01 g mol-1) dry deposition flux
DRYDEPFLX_OCPO molec cm-2 s-1

Hydrophobic organic carbon aerosol (MW = 12.01 g mol-1) dry deposition flux
DRYDEPFLX_SALA molec cm-2 s-1

Fine (0.01-0.05 microns) sea salt aerosol (MW = 31.40 g mol-1) dry deposition flux
DRYDEPFLX_SALC molec cm-2 s-1

Coarse (0.5-8 microns) sea salt aerosol (MW = 31.40 g mol-1) dry deposition flux
DST1 Mol fraction

Dust aerosol, Reff = 0.7 microns (MW = 29.00 g mol-1) volume mixing ratio dry air
DST2 Mol fraction

Dust aerosol, Reff = 1.4 microns (MW = 29.00 g mol-1) volume mixing ratio dry air
DST3 Mol fraction

Dust aerosol, Reff = 2.4 microns (MW = 29.00 g mol-1) volume mixing ratio dry air
DST4 Mol fraction

Dust aerosol, Reff = 4.5 microns (MW = 29.00 g mol-1) volume mixing ratio dry air
EOH Mol fraction

Ethanol (C2H5OH, MW = 46.07 g mol-1) volume mixing ratio dry air
H2O2 Mol fraction

Hydrogen peroxide (H2O2, MW = 34.00 g mol-1) volume mixing ratio dry air
HCHO Mol fraction

Formaldehyde (CH2O, MW = 30.00 g mol-1) volume mixing ratio dry air
HNO3 Mol fraction

Nitric acid (HNO3, MW = 63.00 g mol-1) volume mixing ratio dry air
HNO4 Mol fraction

Peroxynitric acid (HNO4, MW = 79.00 g mol-1) volume mixing ratio dry air
ISOP Mol fraction

Isoprene (CH2=C(CH3)CH=CH2, MW = 68.12 g mol-1) volume mixing ratio dry air
MACR Mol fraction

Methacrolein (CH2=C(CH3)CHO, MW = 70.00 g mol-1) volume mixing ratio dry air
MEK Mol fraction

Methyl Ethyl Ketone (RC(O)R, MW = 72.11 g mol-1) volume mixing ratio dry air
MVK Mol fraction

Methyl vinyl ketone (CH2=CHC(=O)CH3, MW = 70.00 g mol-1) volume mixing ratio dry air
N2O5 Mol fraction

Dinitrogen pentoxide (N2O5, MW = 108.00 g mol-1) volume mixing ratio dry air
NH3 Mol fraction

Ammonia (NH3, MW = 17.00 g mol-1) volume mixing ratio dry air
NH4 Mol fraction

Ammonium (NH4, MW = 18.00 g mol-1) volume mixing ratio dry air
NIT Mol fraction

Inorganic nitrates (MW = 62.00 g mol-1) volume mixing ratio dry air
NO Mol fraction

Nitrogen oxide (NO, MW = 30.00 g mol-1) volume mixing ratio dry air
NO2 Mol fraction

Nitrogen dioxide (NO2, MW = 46.00 g mol-1) volume mixing ratio dry air
NOy Mol fraction

Reactive nitrogen = NO NO2 HNO3 HNO4 HONO 2xN2O5 PAN OrganicNitrates AerosolNitrates
O3 Mol fraction

Ozone (O3, MW = 48.00 g mol-1) volume mixing ratio dry air
OCPI Mol fraction

Hydrophilic organic carbon aerosol (MW = 12.01 g mol-1) volume mixing ratio dry air
OCPO Mol fraction

Hydrophobic organic carbon aerosol (MW = 12.01 g mol-1) volume mixing ratio dry air
PAN Mol fraction

Peroxyacetyl nitrate (CH3C(O)OONO2, MW = 121.00 g mol-1) volume mixing ratio dry air
PHIS m^2 s-2

Surface geopotential height
PM25_RH35_GCC ug m-3

Particulate matter with diameter below 2.5 um RH 35
PM25_RH35_GOCART kg/m^3

Total reconstructed PM2.5 RH 35
PM25bc_RH35_GCC ug m-3

Black carbon particulate matter with diameter below 2.5 um RH 35
PM25du_RH35_GCC ug m-3

Dust particulate matter with diameter below 2.5 um RH 35
PM25ni_RH35_GCC ug m-3

Nitrate particulate matter with diameter below 2.5 um RH 35
PM25oc_RH35_GCC ug m-3

Organic carbon particulate matter with diameter below 2.5 um RH 35
PM25soa_RH35_GCC ug m-3

Secondary organic aerosol particulate matter with diameter below 2.5 um RH 35
PM25ss_RH35_GCC ug m-3

Seasalt particulate matter with diameter below 2.5 um RH 35
PM25su_RH35_GCC ug m-3

Sulfate particulate matter with diameter below 2.5 um RH 35
PRPE Mol fraction

Lumped >= C3 alkenes (C3H6, MW = 42.08 g mol-1) volume mixing ratio dry air
PS Pa

Surface pressure
Q Mass fraction

Specific humidity
Q10M Mass fraction

10-meter specific humidity
Q2M Mass fraction

2-meter specific humidity
RCHO Mol fraction

Lumped aldehyde >= C3 (CH3CH2CHO, MW = 58.00 g mol-1) volume mixing ratio dry air
RH

Relative humidity after moist
SALA Mol fraction

Fine (0.01-0.05 microns) sea salt aerosol (MW = 31.40 g mol-1) volume mixing ratio dry air
SALC Mol fraction

Coarse (0.5-8 microns) sea salt aerosol (MW = 31.40 g mol-1) volume mixing ratio dry air
SLP Pa

Sea level pressure
SO2 Mol fraction

Sulfur dioxide (SO2, MW = 64.00 g mol-1) volume mixing ratio dry air
SOAP Mol fraction

SOA Precursor - lumped species for simplified SOA parameterization (MW = 150.00 g mol-1) volume mixing ratio dry air
SOAS Mol fraction

SOA Simple - simplified non-volatile SOA parameterization (MW = 150.00 g mol-1) volume mixing ratio dry air
T K

Air temperature
T10M K

10-meter air temperature
T2M K

2-meter air temperature
TOLU Mol fraction

Toluene (C7H8, MW = 92.14 g mol-1) volume mixing ratio dry air
TOTCOL_BrO 1.0e15 molec cm-2

Bromine monoxide (BrO, MW = 96.00 g mol-1) total column density
TOTCOL_CO 1.0e15 molec cm-2

Carbon monoxide (CO, MW = 28.00 g mol-1) total column density
TOTCOL_HCHO 1.0e15 molec cm-2

Formaldehyde (CH2O, MW = 30.00 g mol-1) total column density
TOTCOL_IO 1.0e15 molec cm-2

Iodine monoxide (IO, MW = 143.00 g mol-1) total column density
TOTCOL_NO2 1.0e15 molec cm-2

Nitrogen dioxide (NO2, MW = 46.00 g mol-1) total column density
TOTCOL_O3 Dobson

Ozone (O3, MW = 48.00 g mol-1) total column density
TOTCOL_SO2 1.0e15 molec cm-2

Sulfur dioxide (SO2, MW = 64.00 g mol-1) total column density
TPREC kg/m^2/s

Total precipitation
TROPCOL_BrO 1.0e15 molec cm-2

Bromine monoxide (BrO, MW = 96.00 g mol-1) tropospheric column density
TROPCOL_CO 1.0e15 molec cm-2

Carbon monoxide (CO, MW = 28.00 g mol-1) tropospheric column density
TROPCOL_HCHO 1.0e15 molec cm-2

Formaldehyde (CH2O, MW = 30.00 g mol-1) tropospheric column density
TROPCOL_IO 1.0e15 molec cm-2

Iodine monoxide (IO, MW = 143.00 g mol-1) tropospheric column density
TROPCOL_NO2 1.0e15 molec cm-2

Nitrogen dioxide (NO2, MW = 46.00 g mol-1) tropospheric column density
TROPCOL_O3 Dobson

Ozone (O3, MW = 48.00 g mol-1) tropospheric column density
TROPCOL_SO2 1.0e15 molec cm-2

Sulfur dioxide (SO2, MW = 64.00 g mol-1) tropospheric column density
TROPPB Pa

Tropopause pressure based on blended estimate
TS K

Surface skin temperature
U m/s

Eastward wind
U10M m/s

10-meter eastward wind
U2M m/s

2-meter eastward wind
V m/s

Northward wind
V10M m/s

10-meter northward wind
V2M m/s

2-meter northward wind
WETDEPFLX_BCPI kg/m^2/s

Hydrophilic black carbon aerosol (MW = 12.01 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_BCPO kg/m^2/s

Hydrophobic black carbon aerosol (MW = 12.01 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_DST1 kg/m^2/s

Dust aerosol, Reff = 0.7 microns (MW = 29.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_DST2 kg/m^2/s

Dust aerosol, Reff = 1.4 microns (MW = 29.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_DST3 kg/m^2/s

Dust aerosol, Reff = 2.4 microns (MW = 29.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_DST4 kg/m^2/s

Dust aerosol, Reff = 4.5 microns (MW = 29.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_HCHO kg/m^2/s

Formaldehyde (CH2O, MW = 30.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_HNO3 kg/m^2/s

Nitric acid (HNO3, MW = 63.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_NH3 kg/m^2/s

Ammonia (NH3, MW = 17.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_NH4 kg/m^2/s

Ammonium (NH4, MW = 18.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_NIT kg/m^2/s

Inorganic nitrates (MW = 62.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_OCPI kg/m^2/s

Hydrophilic organic carbon aerosol (MW = 12.01 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_OCPO kg/m^2/s

Hydrophobic organic carbon aerosol (MW = 12.01 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_SALA kg/m^2/s

Fine (0.01-0.05 microns) sea salt aerosol (MW = 31.40 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_SALC kg/m^2/s

Coarse (0.5-8 microns) sea salt aerosol (MW = 31.40 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_SO2 kg/m^2/s

Sulfur dioxide (SO2, MW = 64.00 g mol-1) vertical integrated loss due to wet scavenging
WETDEPFLX_SO4 kg/m^2/s

Sulfate (SO4, MW = 96.00 g mol-1) vertical integrated loss due to wet scavenging
XYLE Mol fraction

Xylene (C8H10, MW = 106.16 g mol-1) volume mixing ratio dry air
ZL m

Mid layer heights
ZPBL m

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.

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

DOIs

Explore with Earth Engine

Code Editor (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/v1/fcst/tavg1hr');

Map.setCenter(100, 20, 3);

var weeklyT =
    geosCf.select('T').filterDate('2022-11-01', '2022-11-08').median();
Map.addLayer(weeklyT, imageVisParamT, 'Weekly T', false, 1);

var NO2 = ee.Image('NASA/GEOS-CF/v1/fcst/tavg1hr/20220921_12z-20220921_1230z');
Map.addLayer(NO2, imageVisParamNO2, 'NO2', true, 1);
Open in Code Editor
This dataset contains meteorological forecast (fcst) of time-averaged frequency data (tavg1hr). 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 high-resolution (0.25°) global constituent prediction system from NASA's Global Modeling and Assimilation Office(GMAO). GEOS-CF offers a new …
NASA/GEOS-CF/v1/fcst/tavg1hr, composition,forecast,geos,gmao,nasa
2022-10-01T00:00:00Z/2024-12-21T12:00:00Z
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