List of GEOS-FP met fields

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The GMAO "forward processing" (aka GMAO FP or GEOS5-FP) met field product is the latest update of the GMAO GEOS-5 met data product. (The current GMAO FP data are created with version 5.11.0 of the NASA GEOS-DAS system). GMAO FP has finer native horizontal resolution (0.25° lat x 0.3125° lon) and temporal resolution (hourly data and 3-hourly data) than older GMAO met products such as GEOS-5, the MERRA reanalysis, and GEOS-4.

NOTE: GEOS-Chem only uses a subset of the entire GMAO FP data archive. On this page we list the GMAO FP met fields that archive for use with GEOS-Chem.

GEOS-FP is the name of our GEOS-Chem met field archive of the GMAO FP product. In the discussion below, we will use the terminology "GEOS-FP" in place of "GMAO FP" or "GEOS-5 FP".

For more information, please see:

  1. GEOS5-FP file specification document, Version 1.0 (11 Jun 2013)
  2. GEOS-FP page on the GEOS-Chem wiki
  3. MERRA page on the GEOS-Chem wiki
  4. GEOS-5.2.0 page on the GEOS-Chem wiki
  5. Overview of GMAO met data products
  6. Glossary of variables produced by the GEOS-DAS
  7. Evolution of the GEOS-5 system from GEOS-5.2.0/MERRA to GEOS-5.7.2 (aka "Fortuna")


Constant fields

Overview:

Quantities archived in this file type:
  • Time-invariant fields
    • These are mostly parameters pertaining to the horizontal grid
File naming convention:
  • GEOSFP.20110101.CN.025x03125.CH.nc  (Native resolution nested CH grid)
  • GEOSFP.20110101.CN.025x03125.EU.nc  (Native resolution nested EU grid)
  • GEOSFP.20110101.CN.025x03125.NA.nc  (Native resolution nested NA grid)
  • GEOSFP.20110101.CN.025x03125.NA.nc  (Native resolution nested SE grid)
  • GEOSFP.20110101.CN.2x25.nc  (2° x 2.5° global grid)
  • GEOSFP.20110101.CN.4x5.nc  (4° x 5° global grid)
Timestamps:
  • For convenience, we have assigned these data timestamp of 2011/01/01 00:00 UTC


List of MERRA2 data fields in this file type:

Field Units Collection Description Notes Where used in GEOS-Chem?
FRLAKE 1 const_2d_asm_Nx Fraction of lake type in grid box
  • CH4 simulation,
  • diagnostics
FRLAND 1 const_2d_asm_Nx Fraction of land type in grid box
  • Chemistry
  • Hg simulation
  • CH4 simulation
  • PBL mixing
FRLANDIC(E) 1 const_2d_asm_Nx Fraction of land ice type in grid box
  • The original name in the GEOS-FP raw data files is FRLANDICE.
  • We shorten this to FRLANDIC for GEOS-Chem. GEOS-Chem requires 8-character met field names.
  • Hg simulation
  • CH4 simulation
  • PBL mixing
FROCEAN 1 const_2d_asm_Nx Fraction of ocean in grid box
  • Chemistry
  • Hg simulation
  • CH4 simulation
  • Emissions
PHIS m2 s-2 const_2d_asm_Nx Surface geopotential
  • Kept for diagnostics

--Bob Y. 14:01, 21 October 2013 (EDT)

A1 fields

Overview:

Quantities archived in this file type:
  • Various surface fields
File naming convention:
  • GEOSFP.YYYYMMDD.A1.025x03125.CH.nc  (Native resolution nested CH grid)
  • GEOSFP.YYYYMMDD.A1.025x03125.EU.nc  (Native resolution nested EU grid)
  • GEOSFP.YYYYMMDD.A1.025x03125.NA.nc  (Native resolution nested NA grid)
  • GEOSFP.YYYYMMDD.A1.025x03125.SE.nc  (Native resolution nested SE grid)
  • GEOSFP.YYYYMMDD.A1.2x25.nc  (2° x 2.5° global grid)
  • GEOSFP.YYYYMMDD.A1.4x5.nc  (4° x 5° global grid)
Timestamps:
  • 00:30, 01:30, 02:30, 3:30, 4:30, 5:30 ... 23:30 GMT
    • These represent the center of the 1-hour averaging period


List of GEOS-FP data fields in this file type:

Field Units Collection Description Notes Where used in GEOS-Chem?
ALBEDO 1 tavg1_2d_rad_Nx Surface albedo
  • Dry deposition
  • Diagnostics
CLDTOT 1 tavg1_2d_rad_Nx Total cloud fraction
  • For all intents and purposes, CLDTOT = the column sum of CLOUD, but at 1-hour resolution.
  • Photolysis
  • Diagnostics
EFLUX W m-2 tavg1_2d_flx_Nx Total latent energy flux (i.e. latent heat)
  • Kept for diagnostics
EVAP kg m-2 s-2 tavg1_2d_flx_Nx Evaporation from turbulence
  • Kept for diagnostics
FRSEAICE 1 tavg1_2d_flx_Nx Ice-covered fraction of tile (i.e. sea ice fraction)
  • We bin FRSEAICE to create the SEAICE** fields listed below.
  • Hg simulation
FRSNO 1 tavg1_2d_lnd_Nx Fractional area of land snowcover
  • PBL mixing
  • Hg simulation
GRN 1 tavg1_2d_lnd_Nx Vegetation greenness fraction
  • Kept for diagnostics
GWETROOT 1 tavg1_2d_lnd_Nx Root zone soil wetness
  • Kept for diagnostics
GWETTOP 1 tavg1_2d_lnd_Nx Top soil wetness
  • CH4 simulation
  • Dust mobilization
HFLUX W m-2 tavg1_2d_flx_Nx Sensible heat flux from turbulence
  • Dry deposition
LAI m2 m-2 tavg1_2d_lnd_Nx Leaf area index
  • NOTE: GEOS-Chem uses MODIS LAI instead of the GEOS-FP LAI..
  • Kept for diagnostics
LWGNT W m-2 tavg1_2d_rad_Nx Upwelling longwave flux at top of atmosphere
  • Kept for diagnostics
LWI 1 - Land/water/ice flags
  • We derive LWI from the FRSEAICE, FROCEAN, and FRLAND fields.
  • GEOS-Chem needs LWI for backwards compatibility.
  • To determine the overall surface type in a grid box
LWTUP W m-2 tavg1_2d_rad_Nx Upwelling longwave flux at top of atmosphere
  • Kept for diagnostics
PARDF W m-2 tavg1_2d_lnd_Nx Surface downwelling PAR diffusive flux
  • Biogenic emissions
PARDR W m-2 tavg1_2d_lnd_Nx Surface downwelling PAR direct flux
  • Biogenic emissions
PBLH m tavg1_2d_flx_Nx Planetary boundary layer height
  • PBL mixing
PRECANV kg m-2 s-2 tavg1_2d_flx_Nx Anvil precipitation
  • Kept for diagnostics
PRECCON kg m-2 s-2 tavg1_2d_flx_Nx Convective precipitation
  • Soil NOx emissions
  • Wet deposition
PRECLSC kg m-2 s-2 tavg1_2d_flx_Nx Non-anvil large-scale precipitation
  • Kept for diagnostics
PRECSNO kg m-2 s-2 tavg1_2d_flx_Nx Snowfall
  • Kept for diagnostics
PRECTOT kg m-2 s-2 tavg1_2d_flx_Nx Total precipitation
  • Soil NOx emissions
  • Wet deposition
QV2M kg kg-1 tavg1_2d_slv_Nx Specific humidity at 2 m above the displacement height
  • Kept for diagnostics
Q850 kg kg-1 tavg1_2d_slv_Nx Specific humidity at 850 hPa
  • Dust mobilization
SEAICE00 1 - Fraction of grid box that has < 10% sea ice coverage
  • Arctic simulations
  • Diagnostics
SEAICE10 1 - Fraction of grid box that has 10-20% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE20 1 - Fraction of grid box that has 20-30% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE30 1 - Fraction of grid box that has 30-40% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE40 1 - Fraction of grid box that has 40-50% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE50 1 - Fraction of grid box that has 50-60% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE60 1 - Fraction of grid box that has 60-70% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE70 1 - Fraction of grid box that has 70-80% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE80 1 - Fraction of grid box that has 80-90% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SEAICE90 1 - Fraction of grid box that has > 90% sea ice coverage
  • Arctic simulations
  • Planeflight diagnostics
SLP hPa tavg1_2d_slv_Nx Sea level pressure
  • Original units of SLP are Pa.
  • We convert Pa -> hPa because GEOS-Chem expects hPa.
  • Kept for diagnostics
SNODP m tavg1_2d_lnd_Nx Snow depth
  • Kept for diagnostics
SNOMAS kg m-2 tavg1_2d_lnd_Nx Total snow storage on land
  • Dust mobilization
  • Hg simulations
  • Dry deposition
SWGDN W m-2 tavg1_2d_rad_Nx Surface incident shortwave flux
  • GEOS-Chem carries this as State_Met%RADSWG
  • Soil NOx emissions
  • Hg simulations
  • Dry deposition
SWGNT W m-2 tavg1_2d_rad_Nx Surface net downward shortwave flux
  • Kept for diagnostics
TO3 Dobsons tavg1_2d_slv_Nx Total column ozone
  • Used as input to photolysis
TROPPT hPa tavg1_2d_slv_Nx T based tropopause pressure
  • Original units of TROPPT are Pa.
  • We convert Pa -> hPa because GEOS-Chem expects hPa.
  • Used to determine tropopause height
TS K tavg1_2d_slv_Nx Surface skin temperature
  • GEOS-Chem carries this as State_Met%TSKIN
  • CH4 simulation
  • Hg simulation
  • Sea salt emissions
T2M K tavg1_2d_slv_Nx 2-meter air temperature
  • GEOS-Chem carries this as State_Met%TS
  • GEOS-Chem uses T2M as a proxy for surface air temp.
  • Many locations
T10M K tavg1_2d_slv_Nx 10-meter air temperature
  • Dust mobilization
U10M m s-1 tavg1_2d_slv_Nx 10-meter eastward wind
  • Dry deposition
  • Dust mobilization
  • Emissions
  • Sea salt aerosols
  • Hg simulations
USTAR m s-1 tavg1_2d_flx_Nx Surface velocity scake (aka friction velocity)
  • Dry deposition
V10M m s-1 tavg1_2d_slv_Nx 10-meter northward wind
  • Dry deposition
  • Dust mobilization
  • Emissions
  • Sea salt aerosols
  • Hg simulations
Z0M m tavg1_2d_flx_Nx Roughness length, momentum
  • Dry deposition

--Bob Y. 14:02, 21 October 2013 (EDT)

A3cld fields

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOSFP.YYYYMMDD.A3cld.025x03125.CH.nc  (Native resolution, nested CH grid)
    • GEOSFP.YYYYMMDD.A3cld.025x03125.EU.nc  (Native resolution, nested EU grid)
    • GEOSFP.YYYYMMDD.A3cld.025x03125.NA.nc  (Native resolution, nested NA grid)
    • GEOSFP.YYYYMMDD.A3cld.025x03125.SE.nc  (Native resolution, nested SE grid)
    • GEOSFP.YYYYMMDD.A3cld.2x25.nc  (2° x 2.5° global grid)
    • GEOSFP.YYYYMMDD.A3cld.4x5.nc  (4° x 5° global grid)
  2. All A3 fields are 3-dimensional (lon,lat,alt). Data is placed at the vertical center of each grid box.
  3. Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  4. The Collection indicates the GEOS-FP raw data files in which each field may be found.
    • A GEOS-FP raw data file is created for each new date and time.
    • Therefore, the A3cld data fields listed below will be spread over 8 individual GEOS-FP raw data files.


Field Units Collection Description Notes Where used in GEOS-Chem?
CLOUD 1 tavg3_3d_rad_Nv Total cloud fraction in grid box
  • Photolysis
  • Chemistry
OPTDEPTH 1 none Total in-cloud optical depth (visible band)
  • Photolysis
  • Chemistry
QCCU 1 tavg3_3d_cld_Nv Cloud condensate mixing ratio, convective updraft
  • Kept for diagnostics
QI kg kg-1 none Cloud ice water mixing ratio
  • We create QI = QIAN + QILS, then regrid.
  • Chemistry
  • Aerosol microphysics
QL kg kg-1 tavg3_3d_cld_Nv Cloud liquid water mixing ratio - anvils
  • We create QL = QLAN + QLLS, then regrid.
  • Chemistry
  • Aerosol microphysics
TAUCLI 1 tavg3_3d_cld_Nv In-cloud ice cloud optical thickness (visible band)
  • Kept for diagnostics
TAUCLW 1 tavg3_3d_cld_Nv In-cloud liquid cloud optical thickness (visible band)
  • Kept for diagnostics
      These fields are only used to create other A3cld fields.    
QIAN kg kg-1 tavg3_3d_cld_Nv Cloud ice water mixing ratio - anvils
  • We only use QIAN to construct QI.
  • We do not save QIAN to the A3cld files.
QILS kg kg-1 tavg3_3d_cld_Nv Cloud ice water mixing ratio - large-scale
  • We only use QILS to construct QI.
  • We do not save QILS to the A3cld files.
QLAN kg kg-1 tavg3_3d_cld_Nv Cloud liquid water mixing ratio - anvils
  • We only use QLAN to construct QL.
  • We do not save QLAN to the A3cld files.
QLLS kg kg-1 tavg3_3d_cld_Nv Cloud liquid water mixing ratio - large-scale
  • We only use QLLS to construct QL.
  • We do not save QLLS to the A3cld files.

--Bob Y. 14:06, 21 October 2013 (EDT)

A3dyn fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOSFP.YYYYMMDD.A3dyn.025x03125.CH.nc (Native resolution, nested CH grid)
    • GEOSFP.YYYYMMDD.A3dyn.025x03125.EU.nc (Native resolution, nested EU grid)
    • GEOSFP.YYYYMMDD.A3dyn.025x03125.NA.nc (Native resolution, nested NA grid)
    • GEOSFP.YYYYMMDD.A3dyn.025x03125.SE.nc (Native resolution, nested SE grid)
    • GEOSFP.YYYYMMDD.A3dyn.2x25.nc (2° x 2.5° global grid)
    • GEOSFP.YYYYMMDD.A3dyn.4x5.nc (4° x 5° global grid)
  2. All A3 fields are 3-dimensional (lon,lat,alt). Data is placed at the vertical center of each grid box.
  3. Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  4. The Collection indicates the GEOS-FP raw data files in which each field may be found.
    • A GEOS-FP raw data file is created for each new date and time.
    • Therefore, the A3dyn data fields listed below will be spread over 8 individual GEOS-FP raw data files.


Field Units Collection Description Notes Where used in GEOS-Chem?
DTRAIN kg m-2 s-2 tavg3_3d_cld_Nv Detrainment cloud mass flux
  • Cloud convection
OMEGA Pa s-1 tavg3_3d_asm_Nv Vertical pressure velocity
  • Kept for diagnostics
RH 1 tavg3_3d_cld_Nv Relative humidity GMAO computes RH as follows:
  • T > 273.16 K: w/r/t liquid
  • T < 253.16 K: w/r/t ice
  • 253.16 K <= T <= 273.16K: weighted avg w/r/t both liquid and ice
  • Chemistry
  • Wet deposition
  • Aerosol therm. equilib.
  • Aerosol microphysics
U m s-1 tavg3_3d_asm_Nv Eastward component of wind
  • Advection
V m s-1 tavg3_3d_asm_Nv Northward component of wind
  • Advection

--Bob Y. 14:16, 21 October 2013 (EDT)

A3mstC fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOSFP.YYYYMMDD.A3mstC.025x03125.CH.nc (Native resolution, nested CH grid)
    • GEOSFP.YYYYMMDD.A3mstC.025x03125.EU.nc (Native resolution, nested EU grid)
    • GEOSFP.YYYYMMDD.A3mstC.025x03125.NA.nc (Native resolution, nested NA grid)
    • GEOSFP.YYYYMMDD.A3mstC.025x03125.SE.nc (Native resolution, nested SE grid)
    • GEOSFP.YYYYMMDD.A3mstC.2x25.nc (2° x 2.5° global grid)
    • GEOSFP.YYYYMMDD.A3mstC.4x5.nc (4° x 5° global grid)
  2. All A3 fields are 3-dimensional (lon,lat,alt). Data is placed at the vertical center of each grid box.
  3. Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  4. The Collection indicates the GEOS-FP raw data files in which each field may be found.
    • A GEOS-FP raw data file is created for each new date and time.
    • Therefore, the A3mstC data fields listed below will be spread over 8 individual GEOS-FP raw data files.


Field Units Collection Description Notes Where used in GEOS-Chem?
DQRCU kg kg-1 s-1 tavg3_3d_mst_Nv Convective rainwater source
  • Conv. updraft scavenging
DQRLSAN kg kg-1 s-1 tavg3_3d_mst_Nv Large-scale rainwater source
  • Wet deposition
REEVAPCN kg kg-1 s-1 tavg3_3d_mst_Nv Evaporative submlimation of convective precipitation
  • Conv. updraft scavenging
REEVAPLS(AN) kg kg-1 s-1 tavg3_3d_mst_Nv Evaporation of precipitating LS & anvil condensate
  • In the GEOS-FP raw data files, this field is named REEVAPLSAN.
  • In the files created for GEOS-Chem, we change the field name to REEVAPLS.
  • GEOS-Chem requires 8-character met field names for backwards compatibility.
  • Wet deposition

--Bob Y. 14:17, 21 October 2013 (EDT)

A3mstE fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOSFP.YYYYMMDD.A3mstE.025x03125.CH.nc  (Native resolution, nested CH grid)
    • GEOSFP.YYYYMMDD.A3mstE.025x03125.EU.nc  (Native resolution, nested EU grid)
    • GEOSFP.YYYYMMDD.A3mstE.025x03125.NA.nc  (Native resolution, nested NA grid)
    • GEOSFP.YYYYMMDD.A3mstE.025x03125.SE.nc  (Native resolution, nested SE grid)
    • GEOSFP.YYYYMMDD.A3mstE.2x25.nc  (2° x 2.5° global grid)
    • GEOSFP.YYYYMMDD.A3mstE.4x5.nc  (4° x 5° global grid)
  2. All A3 fields are 3-dimensional (lon,lat,alt). Data is placed on the edges of the grid boxes.
  3. Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  4. The Collection indicates the GEOS-FP raw data files in which each field may be found.
    • A GEOS-FP raw data file is created for each new date and time.
    • Therefore, the A3mstE data fields listed below will be spread over 8 individual GEOS-FP raw data files.


Field Units Collection Description Notes Where used in GEOS-Chem?
CMFMC kg m-2 s-2 tavg3_3d_mst_Ne Upward moist convective mass flux
  • Cloud convection
PFICU kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of ice convective precipitation
  • Conv. updraft scavenging
PFILSAN kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of ice non-convective precipitation
  • Wet deposition
PFLCU kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of liquid convective precipitation
  • Conv. updraft scavenging
PFLLSAN kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of liquid non-convective precipitation
  • Wet deposition

--Bob Y. 14:18, 21 October 2013 (EDT)

I3 fields

NOTES:

  1. These are 3-hr instantaneous fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.I3.025x03125.CH.nc  (Native resolution, nested China grid)
    • GEOS572.YYYYMMDD.I3.025x03125.NA.nc  (Native resolution, nested North America grid)
    • GEOS572.YYYYMMDD.I3.2x25.nc  (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.I3.4x5.nc  (4° x 5° global grid)
    • At present (Aug 2013), the file names still reflect the older GEOS572 nomenclature. We will correct this at a future date.
  2. I3 fields are either 2-dimensional (lon,lat) or 3D (lon,lat,alt). 3D data is placed at the vertical centers of the grid box.
  3. Timestamps: Instantaneous values at 00:00, 03:00, 06:00, 09:00, 12:00, 15:00, 18:00, 21:00 GMT
  4. The Collection indicates the GEOS-FP raw data files in which each field may be found.
    • A GEOS-FP raw data file is created for each new date and time.
    • Therefore, the I3 data fields listed below will be spread over 8 individual GEOS-FP raw data files.


Field Units Collection Description Notes Where used in GEOS-Chem?
PS hPa inst3_3d_asm_Nv Surface pressure
  • Original units of PS are Pa.
  • We convert Pa -> hPa, because GEOS-Chem expects hPa.
  • Advection
  • Many other locations
PV K m2 kg-1 s-1 inst3_3d_asm_Nv Ertel potential vorticity
  • This field is labeled EPV in the GEOS-FP raw data files.
  • GEOS-Chem renames this to "PV" for backwards compatibility with older met products.
  • Kept for diagnostics
QV kg kg-1 inst3_3d_asm_Nv Specific humidity In GEOS-Chem:
  • QV at time t is converted to g/kg and saved into State_Met%SPHU1;
  • QV at time t+3hr is converted to g/kg and saved into State_Met%SPHU2;
  • QV is then interpolated to the current time.
  • Chemistry
  • Wet deposition
  • PBL mixing
T K inst3_3d_asm_Nv Temperature In GEOS-Chem:
  • T @ time t is saved into State_Met%TMPU1;
  • T @ time t+3h is saved into State_Met%TMPU2;
  • T is then interpolated to the current time.
  • Many locations

--Bob Y. 12:31, 16 August 2013 (EDT)

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