List of MERRA2 met fields
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 GEOSFP). But MERRA2 uses the identical vertical grid as the GEOS5, MERRA, and the "GEOSFP" data products used by GEOSChem.
NOTE: GEOSChem 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 GEOSChem.
Contents
Constant fields
Overview:
Quantities archived in this file type: 


File naming convention: 

Timestamps: 

List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

FRLAKE  1  const_2d_asm_Nx  fraction_of_lake 
 
FRLAND  1  const_2d_asm_Nx  fraction_of_land 
 
FRLANDIC(E)  1  const_2d_asm_Nx  fraction_of_land_ice 


FROCEAN  1  const_2d_asm_Nx  fraction_of_ocean 
 
PHIS  m^{2} s^{2}  const_2d_asm_Nx  surface_geopotential_height 

Bob Y. (talk) 18:19, 3 August 2015 (UTC)
A1 fields
Overview:
Quantities archived in this file type: 


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List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

ALBEDO  1  tavg1_2d_rad_Nx  surface_albedo 
 
CLDTOT  1  tavg1_2d_rad_Nx  total_cloud_area_fraction 


EFLUX  W m^{2}  tavg1_2d_flx_Nx  total_latent_energy_flux 
 
EVAP  kg m^{2} s^{2}  tavg1_2d_flx_Nx  evaporation_from_turbulence 
 
FRSEAICE  1  tavg1_2d_flx_Nx  ice_covered_fraction_of_tile 


FRSNO  1  tavg1_2d_lnd_Nx  fractional_area_of_land_snowcover 
 
GRN  1  tavg1_2d_lnd_Nx  greenness_fraction 
 
GWETROOT  1  tavg1_2d_lnd_Nx  root_zone_soil_wetness 
 
GWETTOP  1  tavg1_2d_lnd_Nx  surface_soil_wetness 
 
HFLUX  W m^{2}  tavg1_2d_flx_Nx  sensible_heat_flux_from_turbulence 
 
LAI  m^{2} m^{2}  tavg1_2d_lnd_Nx  leaf_area_index 


LWGNT  W m^{2}  tavg1_2d_rad_Nx  surface_net_downward_longwave_flux 
 
LWI  1    land_water_ice_flags 


LWTUP  W m^{2}  tavg1_2d_rad_Nx  upwelling_longwave_flux_at_toa 
 
PARDF  W m^{2}  tavg1_2d_lnd_Nx  surface_downwelling_par_diffuse_flux 


PARDR  W m^{2}  tavg1_2d_lnd_Nx  surface_downwelling_par_beam_flux 


PBLH  m  tavg1_2d_flx_Nx  planetary_boundary_layer_height 
 
PRECANV  kg m^{2} s^{1}  tavg1_2d_flx_Nx  anvil_precipitation 
 
PRECCON  kg m^{2} s^{1}  tavg1_2d_flx_Nx  convective_precipitation 
 
PRECLSC  kg m^{2} s^{1}  tavg1_2d_flx_Nx  nonanvil_large_scale_precipitation 
 
PRECSNO  kg m^{2} s^{1}  tavg1_2d_flx_Nx  snowfall 
 
PRECTOT  kg m^{2} s^{1}  tavg1_2d_flx_Nx  total_precipitation 
 
QV2M  kg kg^{1}  tavg1_2d_slv_Nx  2meter_specific_humidity 
 
Q850  kg kg^{1}  tavg1_2d_slv_Nx  specific_humidity_at_850_hPa 
 
SEAICE00  1    sea_area_ice_fraction_010% 
 
SEAICE10  1    sea_area_ice_fraction_1020% 
 
SEAICE20  1    sea_area_ice_fraction_2030% 
 
SEAICE30  1    sea_area_ice_fraction_3040% 
 
SEAICE40  1    sea_area_ice_fraction_4050% 
 
SEAICE50  1    sea_area_ice_fraction_5060% 
 
SEAICE60  1    sea_area_ice_fraction_6070% 
 
SEAICE70  1    sea_area_ice_fraction_7080% 
 
SEAICE80  1    sea_area_ice_fraction_8090% 
 
SEAICE90  1    sea_area_ice_fraction_90100% 
 
SLP  Pa  tavg1_2d_slv_Nx  sea_level_pressure 


SNODP  m  tavg1_2d_lnd_Nx  snow_depth 
 
SNOMAS  kg m^{2}  tavg1_2d_lnd_Nx  Total_snow_storage_land 
 
SWGDN  W m^{2}  tavg1_2d_rad_Nx  surface_incoming_shortwave_flux 


TO3  Dobsons  tavg1_2d_slv_Nx  total_column_ozone 
 
TROPPT  hPa  tavg1_2d_slv_Nx  tropopause_pressure_based_on_thermal_estimate 


TS  K  tavg1_2d_slv_Nx  surface_skin_temperature 


T2M  K  tavg1_2d_slv_Nx  2meter_air_temperature 


T10M  K  tavg1_2d_slv_Nx  10meter_air_temperature 
 
U10M  m s^{1}  tavg1_2d_slv_Nx  10meter_eastward_wind 
 
USTAR  m s^{1}  tavg1_2d_flx_Nx  surface_velocity_scale 
 
V10M  m s^{1}  tavg1_2d_slv_Nx  10meter_northward_wind 
 
Z0M  m  tavg1_2d_flx_Nx  surface_roughness 

Bob Y. (talk) 16:21, 3 August 2015 (UTC)
A3cld fields
Overview:
Quantities archived in this file type: 


File naming convention: 

Timestamps: 

List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

CLOUD  1  tavg3_3d_cld_Nv  cloud_fraction_for_radiation 


OPTDEPTH  1  none  in_cloud_optical_thickness 


QI  kg kg^{1}  none  mass_fraction_of_cloud_ice_water 
 
QL  kg kg^{1}  tavg3_3d_cld_Nv  mass_fration_of_cloud_liquid_water 
 
TAUCLI  1  tavg3_3d_cld_Nv  in_cloud_optical_thickness_for_ice_clouds 


TAUCLW  1  tavg3_3d_cld_Nv  in_cloud_optical_thickness_for_liquid_clouds 


Bob Y. (talk) 17:32, 3 August 2015 (UTC)
A3dyn fields
Overview:
Quantities archived in this file type: 


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List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

DTRAIN  kg m^{2} s^{1}  tavg3_3d_cld_Nv  detraining_mass_flux 
 
OMEGA  Pa s^{1}  tavg3_3d_asm_Nv  vertical_pressure_velocity 
 
RH  1  tavg3_3d_cld_Nv  relative_humidity_after_moist  GMAO computes RH as follows:


U  m s^{1}  tavg3_3d_asm_Nv  eastward_wind 
 
V  m s^{1}  tavg3_3d_asm_Nv  northward_wind 

Bob Y. (talk) 17:36, 3 August 2015 (UTC)
A3mstC fields
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List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

DQRCU  kg kg^{1} s^{1}  tavg3_3d_mst_Nv  convective_rainwater_source 
 
DQRLSAN  kg kg^{1} s^{1}  tavg3_3d_mst_Nv  large_scale_rainwater_source 
 
REEVAPCN  kg kg^{1} s^{1}  tavg3_3d_mst_Nv  evap_subl_of_convective_precipitation 
 
REEVAPLS(AN)  kg kg^{1} s^{1}  tavg3_3d_mst_Nv  evap_subl_of_non_convective_precipitation 


Bob Y. (talk) 17:46, 3 August 2015 (UTC)
A3mstE fields
Overview:
Quantities archived in this file type: 


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List of MERRA2 data fields in this file type:
Field  Units  Collection  Description  Notes  Where used in GEOSChem? 

CMFMC  kg m^{2} s^{1}  tavg3_3d_mst_Ne  Upward moist convective mass flux 
 
PFICU  kg m^{2} s^{1}  tavg3_3d_mst_Ne  3d flux of ice convective precipitation 
 
PFILSAN  kg m^{2} s^{1}  tavg3_3d_mst_Ne  3d flux of ice nonconvective precipitation 
 
PFLCU  kg m^{2} s^{1}  tavg3_3d_mst_Ne  3d flux of liquid convective precipitation 
 
PFLLSAN  kg m^{2} s^{1}  tavg3_3d_mst_Ne  3d flux of liquid nonconvective precipitation 

Bob Y. (talk) 18:52, 3 August 2015 (UTC)
I3 fields
Overview:
Quantities archived in this file type: 


File naming convention: 

Timestamps: 

List of MERRA2 data fields in this file type:
Field  Units  Collection  Standard name  Notes  Where used in GEOSChem? 

PS  hPa  inst3_3d_asm_Nv  surface_pressure 


PV  K m^{2} kg^{1} s^{1}  inst3_3d_asm_Nv  ertels_potential_vorticity 


QV  kg kg^{1}  inst3_3d_asm_Nv  specific_humidity  In GEOSChem:


T  K  inst3_3d_asm_Nv  air_temperature  In GEOSChem:

