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

NASA/GEOS-CF/v1/rpl/tavg1hr
Dataset Availability
2018-01-01T00:00:00Z–2024-06-17T11:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GEOS-CF/v1/rpl/tavg1hr")
Tags
composition forecast geos gmao nasa

Description

This dataset contains meteorological replay (rpl) of time-average one hour data (tavg1hr). It is built by merging the original GEOS-CF collections chm_tavg_1hr_g1440x721_v1, met_tavg_1hr_g1440x721_x1, and xgc_tavg_1hr_g1440x721_x1. 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

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/rpl/tavg1hr');

Map.setCenter(100, 20, 3);

var weeklyT =
    geosCf.select('T').filterDate('2018-01-01', '2018-01-08').median();
Map.addLayer(weeklyT, imageVisParamT, 'Weekly T', false, 1);

var NO2 = ee.Image('NASA/GEOS-CF/v1/rpl/tavg1hr/20180101_0030z');
Map.addLayer(NO2, imageVisParamNO2, 'NO2', true, 1);
Open in Code Editor