List of MERRA-2 met fields
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MERRA2 is a new NASA/GMAO reanalysis product. It has a horizontal resolution of 0.5° lat x 0.625° lon x 72 vertical levels. The horizontal resolution is 2x coarser than the GMAO "forward processing" product (which we refer to as GEOS-FP). But MERRA2 uses the identical vertical grid as the GEOS-5#GEOS-5, MERRA, and the "GEOS-FP" data products used by GEOS-Chem.
NOTE: GEOS-Chem only uses a subset of the entire MERRA2 data archive. On this page we list the MERRA2 met fields that we archive for use with GEOS-Chem.
As of August 2015, we have not finalized this list of MERRA2 met fields that we will archive for GEOS-Chem. If your research requires additional fields not listed below, please contact the GEOS-Chem Support Team.
Constant fields
- These data will be timestamped 2015/01/01 at 00:00 GMT for convenience.
- These are time-invariant constant fields, which will have the following filenames:
- MERRA2.20110101.CN.05x0625.CH.nc (Native resolution nested CH grid)
- MERRA2.20110101.CN.05x0625.EU.nc (Native resolution nested EU grid)
- MERRA2.20110101.CN.05x0625.NA.nc (Native resolution nested NA grid)
- MERRA2.20110101.CN.05x0625.NA.nc (Native resolution nested SE grid)
- MERRA2.20110101.CN.2x25.nc (2° x 2.5° global grid)
- MERRA2.20110101.CN.4x5.nc (4° x 5° global grid)
- The Collection indicates the MERRA2 raw data files in which each field may be found.
- One MERRA2 raw data file is created for each day of data.
- Therefore, the CN data fields listed below will be contained in a single MERRA2 raw data file.
Field | Units | Collection | Standard name | Notes | Where used in GEOS-Chem? |
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FRLAKE | 1 | const_2d_asm_Nx | fraction_of_lake |
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FRLAND | 1 | const_2d_asm_Nx | fraction_of_land |
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FRLANDIC(E) | 1 | const_2d_asm_Nx | fraction_of_land_ice |
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FROCEAN | 1 | const_2d_asm_Nx | fraction_of_ocean |
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PHIS | m2 s-2 | const_2d_asm_Nx | surface_geopotential_height |
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--Bob Y. (talk) 15:48, 3 August 2015 (UTC)
A1 fields
- These are 1-hr time-averaged fields, which will have the following filenames:
- MERRA2.YYYYMMDD.A1.05x0625.CH.nc (Native resolution nested CH grid)
- MERRA2.YYYYMMDD.A1.05x0625.EU.nc (Native resolution nested EU grid)
- MERRA2.YYYYMMDD.A1.05x0625.NA.nc (Native resolution nested NA grid)
- MERRA2.YYYYMMDD.A1.025x03125.SE.nc (Native resolution nested SE grid)
- MERRA2.YYYYMMDD.A1.2x25.nc (2° x 2.5° global grid)
- MERRA2.YYYYMMDD.A1.4x5.nc (4° x 5° global grid)
- All A1 fields are 2-dimensional (lon,lat)
- Timestamps (i.e. center of averaging period): 00:30, 01:30, 02:30 ... 23:30 GMT
- The Collection indicates the GEOS-FP raw data files in which each field may be found.
- One MERRA2 raw data file is created for each new day of data
- Therefore, the A1 data fields listed below will be contained in a single MERRA2 raw data file.
Field | Units | Collection | Description | Notes | Where used in GEOS-Chem? |
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ALBEDO | 1 | tavg1_2d_rad_Nx | Surface albedo |
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CLDTOT | 1 | tavg1_2d_rad_Nx | Total cloud fraction |
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EFLUX | W m-2 | tavg1_2d_flx_Nx | Total latent energy flux (i.e. latent heat) |
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EVAP | kg m-2 s-2 | tavg1_2d_flx_Nx | Evaporation from turbulence |
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FRSEAICE | 1 | tavg1_2d_flx_Nx | Ice-covered fraction of tile (i.e. sea ice fraction) |
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FRSNO | 1 | tavg1_2d_lnd_Nx | Fractional area of land snowcover |
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GRN | 1 | tavg1_2d_lnd_Nx | Vegetation greenness fraction |
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GWETROOT | 1 | tavg1_2d_lnd_Nx | Root zone soil wetness |
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GWETTOP | 1 | tavg1_2d_lnd_Nx | Top soil wetness |
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HFLUX | W m-2 | tavg1_2d_flx_Nx | Sensible heat flux from turbulence |
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LAI | m2 m-2 | tavg1_2d_lnd_Nx | Leaf area index |
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LWGNT | W m-2 | tavg1_2d_rad_Nx | Upwelling longwave flux at top of atmosphere |
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LWI | 1 | - | Land/water/ice flags |
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LWTUP | W m-2 | tavg1_2d_rad_Nx | Upwelling longwave flux at top of atmosphere |
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PARDF | W m-2 | tavg1_2d_lnd_Nx | Surface downwelling PAR diffusive flux |
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PARDR | W m-2 | tavg1_2d_lnd_Nx | Surface downwelling PAR direct flux |
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PBLH | m | tavg1_2d_flx_Nx | Planetary boundary layer height |
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PRECANV | kg m-2 s-2 | tavg1_2d_flx_Nx | Anvil precipitation |
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PRECCON | kg m-2 s-2 | tavg1_2d_flx_Nx | Convective precipitation |
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PRECLSC | kg m-2 s-2 | tavg1_2d_flx_Nx | Non-anvil large-scale precipitation |
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PRECSNO | kg m-2 s-2 | tavg1_2d_flx_Nx | Snowfall |
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PRECTOT | kg m-2 s-2 | tavg1_2d_flx_Nx | Total precipitation |
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QV2M | kg kg-1 | tavg1_2d_slv_Nx | Specific humidity at 2 m above the displacement height |
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Q850 | kg kg-1 | tavg1_2d_slv_Nx | Specific humidity at 850 hPa |
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SEAICE00 | 1 | - | Fraction of grid box that has < 10% sea ice coverage |
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SEAICE10 | 1 | - | Fraction of grid box that has 10-20% sea ice coverage |
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SEAICE20 | 1 | - | Fraction of grid box that has 20-30% sea ice coverage |
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SEAICE30 | 1 | - | Fraction of grid box that has 30-40% sea ice coverage |
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SEAICE40 | 1 | - | Fraction of grid box that has 40-50% sea ice coverage |
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SEAICE50 | 1 | - | Fraction of grid box that has 50-60% sea ice coverage |
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SEAICE60 | 1 | - | Fraction of grid box that has 60-70% sea ice coverage |
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SEAICE70 | 1 | - | Fraction of grid box that has 70-80% sea ice coverage |
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SEAICE80 | 1 | - | Fraction of grid box that has 80-90% sea ice coverage |
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SEAICE90 | 1 | - | Fraction of grid box that has > 90% sea ice coverage |
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SLP | hPa | tavg1_2d_slv_Nx | Sea level pressure |
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SNODP | m | tavg1_2d_lnd_Nx | Snow depth |
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SNOMAS | kg m-2 | tavg1_2d_lnd_Nx | Total snow storage on land |
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SWGDN | W m-2 | tavg1_2d_rad_Nx | Surface incident shortwave flux |
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SWGNT | W m-2 | tavg1_2d_rad_Nx | Surface net downward shortwave flux |
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TO3 | Dobsons | tavg1_2d_slv_Nx | Total column ozone |
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TROPPT | hPa | tavg1_2d_slv_Nx | T based tropopause pressure |
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TS | K | tavg1_2d_slv_Nx | Surface skin temperature |
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T2M | K | tavg1_2d_slv_Nx | 2-meter air temperature |
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T10M | K | tavg1_2d_slv_Nx | 10-meter air temperature |
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U10M | m s-1 | tavg1_2d_slv_Nx | 10-meter eastward wind |
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USTAR | m s-1 | tavg1_2d_flx_Nx | Surface velocity scake (aka friction velocity) |
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V10M | m s-1 | tavg1_2d_slv_Nx | 10-meter northward wind |
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Z0M | m | tavg1_2d_flx_Nx | Roughness length, momentum |
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