List of GEOS-FP met fields

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GEOS-FP (formerly named GEOS-5.7.2) is the latest update of the GEOS-5 met data product. It 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 GEOS-FP data archive. On this page we list the GEOS-FP met fields that archive for use with GEOS-Chem.

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. GEOS-5.7.2 page on the GEOS-Chem wiki
  4. MERRA page on the GEOS-Chem wiki
  5. GEOS-5.2.0 page on the GEOS-Chem wiki
  6. Overview of GMAO met data products

Constant fields

  1. These data will be timestamped 2011/01/01 at 00:00 GMT for convenience.
  2. These are time-invariant constant fields, which will have the following filenames:
    • GEOS572.20110101.CN.025x03125.CH.nc  (Native resolution nested CH grid)
    • GEOS572.20110101.CN.025x03125.NA.nc  (Native resolution nested NA grid)
    • GEOS572.20110101.CN.2x25.nc  (2° x 2.5° global grid)
    • GEOS572.20110101.CN.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.
  3. The Collection is a tag that indicates in which files a particular data field can be found. A GEOS-FP data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.


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 1 const_2d_asm_Nx Fraction of land ice type in grid box
  • 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. 16:56, 15 August 2013 (EDT)

A1 fields

NOTES:

  1. These are 1-hr time-averaged fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.A1.025x03125.CH.nc  (Native resolution nested China grid)
    • GEOS572.YYYYMMDD.A1.025x03125.NA.nc  (Native resolution nested China grid)
    • GEOS572.YYYYMMDD.A1.2x25.nc  (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.A1.4x5.nc  (4° x 5° global grid)
  2. All A1 fields are 2-dimensional (lon,lat)
  3. Timestamps (i.e. center of averaging period): 00:30, 01:30, 02:30 ... 23:30 GMT
  4. The File Collection is a tag that indicates in which files a particular data field can be found. A GEOS-5.7.2 "raw" data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.
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) Used to create the binned 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 product
  • Kept for diagnostics
LWGNT W m-2 tavg1_2d_rad_Nx Upwelling longwave flux at top of atmosphere
  • Kept for diagnostics
LWI unitless Land/water/ice flags Derived
  • Derived from the FRSEAICE, FROCEAN, and FRLAND fields.
  • GEOS-Chem needs LWI backwards compatibility with older met products.
  • 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 fraction Fraction of grid box that has < 10% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE10 fraction Fraction of grid box that has 10-20% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE20 fraction Fraction of grid box that has 20-30% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE30 fraction Fraction of grid box that has 30-40% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE40 fraction Fraction of grid box that has 40-50% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE50 fraction Fraction of grid box that has 50-60% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE60 fraction Fraction of grid box that has 60-70% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE70 fraction Fraction of grid box that has 70-80% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE80 fraction Fraction of grid box that has 80-90% sea ice coverage - Created by separating FRSEAICE into bins - -
SEAICE90 fraction Fraction of grid box that has > 90% sea ice coverage - Created by separating FRSEAICE into bins - -
SLP hPa tavg1_2d_slv_Nx Sea level pressure
  • Original units in GEOS-FP raw data files are Pa
  • We convert Pa -> hPa because GEOS-Chem expects Pa
  • Kept for diagnostics
SNODP m Snow depth tavg1_2d_lnd_Nx SNODP m
SNOMAS kg m-2 Snow mass tavg1_2d_lnd_Nx SNOMAS mm H2O
SWGDN W m-2 Surface incident shortwave flux tavg1_2d_rad_Nx SWGDN W m-2
SWGNT W m-2 Net surface downward shortwave flux tavg1_2d_rad_Nx SWGNT W m-2
TROPPT Pa T based tropopause pressure tavg1_2d_slv_Nx Convert to hPa for GEOS-Chem TROPPT Pa
TS K Surface skin temperature tavg1_2d_slv_Nx TS K
T2M K Temperature 2 m above displacement height tavg1_2d_slv_Nx Used as a proxy for surface air temperature in GEOS-5 T2M K
U10M m s-1 Eastward wind 10 m above displacement height tavg1_2d_slv_Nx
tavg1_2d_ocn_Nx 		U10M m s-1
USTAR m s-1 Friction velocity tavg1_2d_flx_Nx USTAR m s-1
V10M m s-1 Northward wind 10 m above displacement height tavg1_2d_slv_Nx
tavg1_2d_ocn_Nx 		V10M m s-1
Z0M m Roughness length, momentum tavg1_2d_flx_Nx Z0M m
    Derived fields        


--Bob Y. 16:00, 12 January 2012 (EST)

A3cld fields

  • These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.A3cld.025x03125.SEA4CRS.nc  (Native resolution, nested China grid)
    • GEOS572.YYYYMMDD.A3cld.2x25.nc  (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.A3cld.4x5.nc  (4° x 5° global grid)
  • All A3 fields are 3-dimensional (lon,lat,alt). Data is placed at the vertical center of each grid box.
  • Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  • The File Collection is a tag that indicates in which files a particular data field can be found. A GEOS-5.7.2 "raw" data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.
  • The MERRA Field and MERRA Units refer to the equivalent data fields (and units) in the MERRA data archive for GEOS-Chem. If a field is missing it does not necessarily mean that it was not produced in MERRA; it just means that we did not regrid it for use with GEOS-Chem.


GEOS-5.7.2
Field 		GEOS-5.7.2
Units 		Description File collection Notes MERRA
Field 		MERRA
Units
CLOUD fraction Total cloud fraction in grid box tavg3_3d_rad_Nv Regrid with Hongyu Liu's algorithm CFLS + CFAN + CFCU fraction
QIAN kg kg-1 Cloud ice water mixing ratio - anvils tavg3_3d_cld_Nv Used to construct QI - -
QILS kg kg-1 Cloud ice water mixing ratio - large-scale tavg3_3d_cld_Nv Used to construct QI - -
QLAN kg kg-1 Cloud liquid water mixing ratio - anvils tavg3_3d_cld_Nv Used to construct QL - -
QLLS kg kg-1 Cloud liquid water mixing ratio - large-scale tavg3_3d_cld_Nv Used to construct QL - -


TAUCLI unitless In-cloud ice cloud optical thickness (visible band) tavg3_3d_cld_Nv Regrid w/ Hongyu Liu's algorithm TAUCLI unitless
TAUCLW unitless In-cloud liquid cloud optical thickness (visible band) tavg3_3d_cld_Nv Regrid w/ Hongyu Liu's algorithm TAUCLW unitless
    Derived fields        
QI kg kg-1 Cloud ice water mixing ratio tavg3_3d_cld_Nv QI = QIAN + QILS QI kg kg-1
QL kg kg-1 Cloud liquid water mixing ratio - anvils tavg3_3d_cld_Nv QL = QLAN + QLLS QL kg kg-1
OPTDEPTH unitless Total in-cloud optical depth (visible band) - = TAUCLI + TAUCLW;
Regrid w/ Hongyu Liu's algorithm 		OPTDEPTH unitless
    Fields we are considering adding        
CFAN fraction 3D cloud fraction, anvils tavg3_3d_cld_Nv Regrid with Hongyu Liu's algorithm CFAN fraction
CFCU fraction 3D cloud fraction, convective tavg3_3d_cld_Nv Regrid with Hongyu Liu's algorithm CFCU fraction
CFLS fraction 3D cloud fraction, large-scale tavg3_3d_cld_Nv Regrid with Hongyu Liu's algorithm CFLS fraction
QCCU fraction Cloud condensate mixing ration, convective updraft tavg3_3d_cld_Nv Regrid with Hongyu Liu's algorithm - -

--Bob Y. 11:32, 29 February 2012 (EST)

A3dyn fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.A3dyn.025x03125.CH.nc (Native resolution, nested China grid)
    • GEOS572.YYYYMMDD.A3dyn.025x03125.NA.nc (Native resolution, nested North America grid)
    • GEOS572.YYYYMMDD.A3dyn.2x25.nc (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.A3dyn.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. 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 is a tag that indicates in which files a particular data field can be found. A GEOS-FP data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual 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
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 fraction tavg3_3d_cld_Nv Relative humidity RH is computed 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. 17:03, 15 August 2013 (EDT)

A3mstC fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.A3mstC.025x03125.CH.nc (Native resolution, nested China grid)
    • GEOS572.YYYYMMDD.A3mstC.025x03125.NA.nc (Native resolution, nested NA grid)
    • GEOS572.YYYYMMDD.A3mstC.2x25.nc (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.A3mstC.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. All A3 fields are 3-dimensional (lon,lat,alt). Data is placed at the vertical center of each grid box.
  • Timestamps (i.e. center of averaging period): 01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT
  • The Collection is a tag that indicates in which files a particular data field can be found. A GEOS-FP "raw" data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.


Field Units Collection Description Notes Where used in GEOS-Chem?
DQRCU kg kg-1 s-1 tavg3_3d_mst_Nv Convective rainwater source Convective 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 Convective 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 needs 8-character met field names for backwards compatibility.
 Wet deposition

--Bob Y. 16:43, 15 August 2013 (EDT)

A3mstE fields

NOTES:

  1. These are 3-hr time-averaged fields, which will have the following filenames:
    • GEOS572.YYYYMMDD.A3mstE.025x03125.SEA4CRS.nc  (Native resolution, nested China grid)
    • GEOS572.YYYYMMDD.A3mstE.2x25.nc  (2° x 2.5° global grid)
    • GEOS572.YYYYMMDD.A3mstE.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. 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 File Collection is a tag that indicates in which files a particular data field can be found. A GEOS-FP "raw" data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.


Field Units Collection Description Notes Where used in GEOS-Chem?
PFICU kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of ice convective precipitation Convective 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 Convective updraft scavenging
PFLLSAN kg m-2 s-1 tavg3_3d_mst_Ne 3d flux of liquid non-convective precipitation Wet deposition

--Bob Y. 16:21, 15 August 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 File Collection is a tag that indicates in which files a particular data field can be found. A GEOS-FP "raw" data file is created for each new date and time. Therefore, a day's worth of hourly data will be spread over 24 individual files and a day's worth of 3-hourly data will be spread over 8 individual files.


Field Units Collection Description Notes Where used in GEOS-Chem?
PS hPa inst3_3d_asm_Nv Surface pressure
  • Original units in GEOS-FP raw data files 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 saved into State_Met%SPHU1;
  • QV at time t+3hr is saved into State_Met%SPHU2;
  • QV is then linearly interpolated to the current time.
  • Chemistry
  • Wet deposition
  • PBL mixing
T K inst3_3d_asm_Nv Temperature In GEOS-Chem:
  • T at time t is saved into State_Met%TMPU1;
  • T at time t+3hr is saved into State_Met%TMPU2;
  • T is then linearly interpolated to the current time.
 Many locations

--Bob Y. 16:10, 15 August 2013 (EDT)

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