View source for List of MERRA-2 met fields

[[MERRA-2]] is a new NASA/GMAO reanalysis product.  It has a horizontal resolution of 0.5&deg; lat x 0.625&deg; 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 MERRA-2 uses the identical vertical grid as the [[GEOS-5#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 MERRA-2 data archive. On this page we list the MERRA-2 met fields that we archive for use with GEOS-Chem.

== Constant fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Time-invariant fields
**These are mostly parameters pertaining to the horizontal grid
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.20150101.CN.05x0625.CH.nc</tt>&nbsp; (Native resolution nested CH grid)
*<tt>MERRA2.20150101.CN.05x0625.EU.nc</tt>&nbsp; (Native resolution nested EU grid)
*<tt>MERRA2.20150101.CN.05x0625.NA.nc</tt>&nbsp; (Native resolution nested NA grid)
*<tt>MERRA2.20150101.CN.05x0625.NA.nc</tt>&nbsp; (Native resolution nested SE grid)
*<tt>MERRA2.20150101.CN.2x25.nc</tt>&nbsp; (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.20150101.CN.4x5.nc</tt>&nbsp; (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*For convenience, we have assigned these data timestamp of <tt>2015/01/01 00:00 UTC</tt>
|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2_data_file_collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|FRLAKE       
|1
|const_2d_asm_Nx
|fraction_of_lake
|
|
*CH4 simulation, 
*diagnostics

|-valign="top"
|FRLAND
|1
|const_2d_asm_Nx
|fraction_of_land
|
|
*Chemistry
*Hg simulation
*CH4 simulation
*PBL mixing

|-valign="top"
|FRLANDIC(E)
|1
|const_2d_asm_Nx
|fraction_of_land_ice
|
*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

|-valign="top"
|FROCEAN
|1
|const_2d_asm_Nx
|fraction_of_ocean
| 
|
*Chemistry
*Hg simulation
*CH4 simulation
*Emissions 

|-valign="top"
|PHIS
|m<sup>2</sup> s<sup>-2</sup>
|const_2d_asm_Nx
|surface_geopotential_height
| 
|
*Kept for diagnostics

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:19, 3 August 2015 (UTC)

== A1 fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Various surface fields
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.A1.05x0625.CH.nc</tt>&nbsp; (Native resolution nested CH grid)
*<tt>MERRA2.YYYYMMDD.A1.05x0625.EU.nc</tt>&nbsp; (Native resolution nested EU grid)
*<tt>MERRA2.YYYYMMDD.A1.05x0625.NA.nc</tt>&nbsp; (Native resolution nested NA grid)
*<tt>MERRA2.YYYYMMDD.A1.025x03125.SE.nc</tt>&nbsp; (Native resolution nested SE grid)
*<tt>MERRA2.YYYYMMDD.A1.2x25.nc</tt>&nbsp; (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.A1.4x5.nc</tt>&nbsp; (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|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 MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2 data file collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|ALBEDO
|1
|tavg1_2d_rad_Nx
|surface_albedo
|
|
*Dry deposition
*Diagnostics

|-valign="top"
|CLDTOT
|1
|tavg1_2d_rad_Nx
|total_cloud_area_fraction
|
*For all intents and purposes, CLDTOT = the column sum of CLOUD, but at 1-hour resolution.
|
*Photolysis
*Diagnostics

|-valign="top"
|EFLUX
|W m<sup>-2</sup>
|tavg1_2d_flx_Nx
|total_latent_energy_flux 
|
|
*Kept for diagnostics

|-valign="top"
|EVAP
|kg m<sup>-2</sup> s<sup>-2</sup>
|tavg1_2d_flx_Nx
|evaporation_from_turbulence 
|
|
*Kept for diagnostics

|-valign="top"
|FRSEAICE
|1
|tavg1_2d_flx_Nx
|ice_covered_fraction_of_tile
|
*We bin FRSEAICE to create the SEAICE** fields listed below.
|
*Hg simulation

|-valign="top"
|FRSNO
|1
|tavg1_2d_lnd_Nx
|fractional_area_of_land_snowcover 
|
|
*PBL mixing 
*Hg simulation

|-valign="top"
|GRN
|1
|tavg1_2d_lnd_Nx
|greenness_fraction
|
|
*Kept for diagnostics

|-valign="top"
|GWETROOT
|1
|tavg1_2d_lnd_Nx
|root_zone_soil_wetness
|
|
*Kept for diagnostics

|-valign="top"
|GWETTOP
|1
|tavg1_2d_lnd_Nx
|surface_soil_wetness
|
|
*CH4 simulation
*Dust mobilization

|-valign="top"
|HFLUX
|W m<sup>-2</sup>
|tavg1_2d_flx_Nx
|sensible_heat_flux_from_turbulence
|
|
*Dry deposition

|-valign="top"
|LAI
|m<sup>2</sup> m<sup>-2</sup>
|tavg1_2d_lnd_Nx
|leaf_area_index
|
*NOTE: GEOS-Chem uses MODIS LAI instead of the GEOS-FP LAI..
|
*Kept for diagnostics

|-valign="top"
|LWGNT
|W m<sup>-2</sup>
|tavg1_2d_rad_Nx
|surface_net_downward_longwave_flux
|
|
*Kept for diagnostics

|-valign="top"
|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

|-valign="top"
|LWTUP
|W m<sup>-2</sup>
|tavg1_2d_rad_Nx
|upwelling_longwave_flux_at_toa 
|
|
*Kept for diagnostics

|-valign="top"
|PARDF
|W m<sup>-2</sup>
|tavg1_2d_lnd_Nx
|surface_downwelling_par_diffuse_flux 
|
*The name of this data field in the raw data file is "PARDFLAND".
|
*Biogenic emissions

|-valign="top"
|PARDR
|W m<sup>-2</sup>
|tavg1_2d_lnd_Nx
|surface_downwelling_par_beam_flux 
|
*The name of this data field in the raw data file is "PARDRLAND".
|
*Biogenic emissions

|-valign="top"
|PBLH
|m
|tavg1_2d_flx_Nx
|planetary_boundary_layer_height
|
|
*PBL mixing

|-valign="top"
|PRECANV      
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg1_2d_flx_Nx
|anvil_precipitation
|
|
*Kept for diagnostics

|-valign="top"
|PRECCON
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg1_2d_flx_Nx
|convective_precipitation
|
|
*Soil NOx emissions
*Wet deposition

|-valign="top"
|PRECLSC
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg1_2d_flx_Nx
|nonanvil_large_scale_precipitation 
|
|
*Kept for diagnostics

|-valign="top"
|PRECSNO
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg1_2d_flx_Nx
|snowfall
|
|
*Kept for diagnostics

|-valign="top"
|PRECTOT
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg1_2d_flx_Nx
|total_precipitation
|
|
*Soil NOx emissions
*Wet deposition

|-valign="top"
|QV2M
|kg kg<sup>-1</sup>
|tavg1_2d_slv_Nx
|2-meter_specific_humidity
|
|
*Kept for diagnostics

|-valign="top"
|Q850
|kg kg<sup>-1</sup>
|tavg1_2d_slv_Nx
|specific_humidity_at_850_hPa
|
|
*Dust mobilization

|-valign="top"
|SEAICE00
|1
| -
|sea_area_ice_fraction_0-10%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*Diagnostics

|-valign="top"
|SEAICE10
|1
| -
|sea_area_ice_fraction_10-20%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE20
|1
| -
|sea_area_ice_fraction_20-30%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE30
|1
| -
|sea_area_ice_fraction_30-40%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE40
|1
| -
|sea_area_ice_fraction_40-50%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE50
|1
| -
|sea_area_ice_fraction_50-60%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE60
|1
| -
|sea_area_ice_fraction_60-70%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE70
|1
| -
|sea_area_ice_fraction_70-80%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE80
|1
| -
|sea_area_ice_fraction_80-90%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SEAICE90
|1
| -
|sea_area_ice_fraction_90-100%
|
*[[#Fractional sea ice|We create this by binning FRSEAICE.]]
|
*Arctic simulations
*[[Planeflight diagnostic]]

|-valign="top"
|SLP
|Pa
|tavg1_2d_slv_Nx
|sea_level_pressure
|
*We keep the original units of Pa.
*We convert to hPa when reading into GEOS-Chem.
|
*Kept for diagnostics

|-valign="top"
|SNODP
|m
|tavg1_2d_lnd_Nx
|snow_depth
|
|
*Kept for diagnostics

|-valign="top"
|SNOMAS
|kg m<sup>-2</sup>
|tavg1_2d_lnd_Nx
|Total_snow_storage_land 
|
|
*Dust mobilization
*Hg simulations
*Dry deposition

|-valign="top"
|SWGDN
|W m<sup>-2</sup>
|tavg1_2d_rad_Nx
|surface_incoming_shortwave_flux
|
*GEOS-Chem carries this as <tt>State_Met%RADSWG</tt>
|
*Soil NOx emissions
*Hg simulations
*Dry deposition

|-valign="top"
|TO3
|Dobsons
|tavg1_2d_slv_Nx
|total_column_ozone
| 
|
*Used as input to photolysis

|-valign="top"
|TROPPT
|hPa
|tavg1_2d_slv_Nx
|tropopause_pressure_based_on_thermal_estimate
|
*Original units of TROPPT are Pa.
*We convert Pa -> hPa because GEOS-Chem expects hPa.
|
*Used to determine tropopause height

|-valign="top"
|TS
|K
|tavg1_2d_slv_Nx
|surface_skin_temperature
|
*GEOS-Chem carries this as <tt>State_Met%TSKIN</tt>
|
*CH4 simulation
*Hg simulation
*Sea salt emissions

|-valign="top"
|T2M
|K
|tavg1_2d_slv_Nx
|2-meter_air_temperature
|
*GEOS-Chem carries this as <tt>State_Met%TS</tt>
*GEOS-Chem uses T2M as a proxy for surface air temp.
|
*Many locations

|-valign="top"
|T10M
|K
|tavg1_2d_slv_Nx
|10-meter_air_temperature
|
|
*Dust mobilization

|-valign="top"
|U10M
|m s<sup>-1</sup>
|tavg1_2d_slv_Nx
|10-meter_eastward_wind
|
|
*Dry deposition
*Dust mobilization
*Emissions
*Sea salt aerosols
*Hg simulations

|-valign="top"
|USTAR
|m s<sup>-1</sup>
|tavg1_2d_flx_Nx
|surface_velocity_scale
|
|
*Dry deposition

|-valign="top"
|V10M
|m s<sup>-1</sup>
|tavg1_2d_slv_Nx
|10-meter_northward_wind
|
|
*Dry deposition
*Dust mobilization
*Emissions
*Sea salt aerosols
*Hg simulations

|-valign="top"
|Z0M
|m
|tavg1_2d_flx_Nx
|surface_roughness
|
|
*Dry deposition

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 16:21, 3 August 2015 (UTC)

== A3cld fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Cloud parameters
**Data are 3-dimensional, stored at the midpoint of each vertical level
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.A3cld.05x0625.CH.nc</tt>&nbsp; (Native resolution, nested CH grid)
*<tt>MERRA2.YYYYMMDD.A3cld.05x0625.EU.nc</tt>&nbsp; (Native resolution, nested EU grid)
*<tt>MERRA2.YYYYMMDD.A3cld.05x0625.NA.nc</tt>&nbsp; (Native resolution, nested NA grid)
*<tt>MERRA2.YYYYMMDD.A3cld.05x0625.SE.nc</tt>&nbsp; (Native resolution, nested SE grid)
*<tt>MERRA2.YYYYMMDD.A3cld.2x25.nc</tt>&nbsp; (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.A3cld.4x5.nc</tt>&nbsp; (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT 
**Timestamps represent the center of the 3-hour averaging period.

|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2_data_file_collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|CLOUD
|1
|tavg3_3d_cld_Nv
|cloud_fraction_for_radiation
|
*We regrid CLOUD w/ [http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS-5_cloud_regridding_equations.pdf Hongyu Liu's algorithm].
|
*Photolysis
*Chemistry

|-valign="top"
|OPTDEPTH
|1
|none
|in_cloud_optical_thickness
|
*We create OPTDEPTH = TAUCLI + TAUCLW.
*We regrid OPTDEPTH w/ [http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS-5_cloud_regridding_equations.pdf Hongyu Liu's algorithm].
|
*Photolysis
*Chemistry

|-valign="top"
|QI
|kg kg<sup>-1</sup>
|none
|mass_fraction_of_cloud_ice_water
|
|
*Chemistry
*Aerosol microphysics

|-valign="top"
|QL
|kg kg<sup>-1</sup>
|tavg3_3d_cld_Nv
|mass_fration_of_cloud_liquid_water
|
|
*Chemistry
*Aerosol microphysics

|-valign="top"
|TAUCLI
|1
|tavg3_3d_cld_Nv
|in_cloud_optical_thickness_for_ice_clouds
|
*We use TAUCLI to create OPTDEPTH.
*We regrid TAUCLI w/ [http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS-5_cloud_regridding_equations.pdf Hongyu Liu's algorithm].
|
*Kept for diagnostics

|-valign="top"
|TAUCLW
|1
|tavg3_3d_cld_Nv
|in_cloud_optical_thickness_for_liquid_clouds
|
*We use TAUCLW to create OPTDEPTH.
*We regrid TAUCLW w/ [http://acmg.seas.harvard.edu/geos/wiki_docs/geos5/GEOS-5_cloud_regridding_equations.pdf Hongyu Liu's algorithm]
|
*Kept for diagnostics

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 17:32, 3 August 2015 (UTC)

== A3dyn fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Dynamical fields (e.g. winds, relative humidity, detrainment fluxes)
**Data are 3-dimensional, stored at the midpoint of each vertical level
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.A3dyn.05x0625.CH.nc</tt> (Native resolution, nested CH grid)
*<tt>MERRA2.YYYYMMDD.A3dyn.05x0625.EU.nc</tt> (Native resolution, nested EU grid)
*<tt>MERRA2.YYYYMMDD.A3dyn.05x0625.NA.nc</tt> (Native resolution, nested NA grid)
*<tt>MERRA2.YYYYMMDD.A3dyn.05x0625.SE.nc</tt> (Native resolution, nested SE grid)
*<tt>MERRA2.YYYYMMDD.A3dyn.2x25.nc</tt> (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.A3dyn.4x5.nc</tt> (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT 
**Timestamps represent the center of the 3-hour averaging period.
|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2_data_file_collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|DTRAIN
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_cld_Nv
|detraining_mass_flux
|
|
*Cloud convection

|-valign="top"
|OMEGA
|Pa s<sup>-1</sup>
|tavg3_3d_asm_Nv
|vertical_pressure_velocity
|
|
*Kept for diagnostics

|-valign="top"
|RH
|1
|tavg3_3d_cld_Nv
|relative_humidity_after_moist
|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

|-valign="top"
|U
|m s<sup>-1</sup>
|tavg3_3d_asm_Nv
|eastward_wind
|
|
*Advection

|-valign="top"
|V
|m s<sup>-1</sup>
|tavg3_3d_asm_Nv
|northward_wind
|
|
*Advection

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 17:36, 3 August 2015 (UTC)

== A3mstC fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Precipitation and sublimation fields
**Data are 3-dimensional, stored at the midpoint of each vertical level
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.A3mstC.05x0625.CH.nc</tt> (Native resolution, nested CH grid)
*<tt>MERRA2.YYYYMMDD.A3mstC.05x0625.EU.nc</tt> (Native resolution, nested EU grid)
*<tt>MERRA2.YYYYMMDD.A3mstC.05x0625.NA.nc</tt> (Native resolution, nested NA grid)
*<tt>MERRA2.YYYYMMDD.A3mstC.05x0625.SE.nc</tt> (Native resolution, nested SE grid)
*<tt>MERRA2.YYYYMMDD.A3mstC.2x25.nc</tt> (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.A3mstC.4x5.nc</tt> (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT 
**Timestamps represent the center of the 3-hour averaging period.
|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2_data_file_collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|DQRCU
|kg kg<sup>-1</sup> s<sup>-1</sup>
|tavg3_3d_mst_Nv
|convective_rainwater_source 
|
|
*Conv. updraft scavenging

|-valign="top"
|DQRLSAN
|kg kg<sup>-1</sup> s<sup>-1</sup>
|tavg3_3d_mst_Nv
|large_scale_rainwater_source 
|
|
*Wet deposition

|-valign="top"
|REEVAPCN
|kg kg<sup>-1</sup> s<sup>-1</sup> 
|tavg3_3d_mst_Nv
|evap_subl_of_convective_precipitation 
|
|
*Conv. updraft scavenging

|-valign="top"
|REEVAPLS(AN)
|kg kg<sup>-1</sup> s<sup>-1</sup> 
|tavg3_3d_mst_Nv
|evap_subl_of_non_convective_precipitation
|
*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
|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 17:46, 3 August 2015 (UTC)

== A3mstE fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Precipitation and convection fields
**Data are 3-dimensional, stored at the edges of each vertical level
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.A3mstE.05x0625.CH.nc</tt>&nbsp; (Native resolution, nested CH grid)
*<tt>MERRA2.YYYYMMDD.A3mstE.05x0625.EU.nc</tt>&nbsp; (Native resolution, nested EU grid)
*<tt>MERRA2.YYYYMMDD.A3mstE.05x0625.NA.nc</tt>&nbsp; (Native resolution, nested NA grid)
*<tt>MERRA2.YYYYMMDD.A3mstE.05x0625.SE.nc</tt>&nbsp; (Native resolution, nested SE grid)
*<tt>MERRA2.YYYYMMDD.A3mstE.2x25.nc</tt>&nbsp; (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.A3mstE.4x5.nc</tt>&nbsp; (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*01:30, 04:30, 07:30, 10:30, 13:30, 16:30, 19:30, 22:30 GMT 
**Timestamps represent the center of the 3-hour averaging period.
|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="110px"|[[MERRA-2#MERRA-2 time archiving|Collection]]
!width="300px"|Description
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|CMFMC
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_mst_Ne
|Upward moist convective mass flux
|
|
*Cloud convection

|-valign="top"
|PFICU
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_mst_Ne
|3d flux of ice convective precipitation 
|
|
*Conv. updraft scavenging

|-valign="top"
|PFILSAN
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_mst_Ne
|3d flux of ice non-convective precipitation 
|
|
*Wet deposition

|-valign="top"
|PFLCU
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_mst_Ne
|3d flux of liquid convective precipitation 
|
|
*Conv. updraft scavenging

|-valign="top"
|PFLLSAN
|kg m<sup>-2</sup> s<sup>-1</sup>
|tavg3_3d_mst_Ne
|3d flux of liquid non-convective precipitation 
|
|
*Wet deposition

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:52, 3 August 2015 (UTC)

== I3 fields ==

'''''Overview:'''''

{| border=1 cellspacing=0 cellpadding=5 
|-valign="top"
!width="300px" bgcolor="#CCCCCC"|Quantities archived in this file type:
|width="700px"|
*Pressure, temperature, humidity
**Data are 3-dimensional, stored at the midpoint of each vertical level
|-valign="top" 
!bgcolor="#CCCCCC"|File naming convention:
|
*<tt>MERRA2.YYYYMMDD.I3.05x0625.CH.nc</tt>&nbsp; (Native resolution, nested China grid)
*<tt>MERRA2.YYYYMMDD.I3.05x0625.EU.nc</tt>&nbsp; (Native resolution, nested Europe grid)
*<tt>MERRA2.YYYYMMDD.I3.05x0625.NA.nc</tt>&nbsp; (Native resolution, nested North America grid)
*<tt>MERRA2.YYYYMMDD.I3.05x0625.SE.nc</tt>&nbsp; (Native resolution, nested SE Asia grid)
*<tt>MERRA2.YYYYMMDD.I3.2x25.nc</tt>&nbsp; (2&deg; x 2.5&deg; global grid)
*<tt>MERRA2.YYYYMMDD.I3.4x5.nc</tt>&nbsp; (4&deg; x 5&deg; global grid)
|-valign="top" 
!bgcolor="#CCCCCC"|[[MERRA-2#MERRA-2 time archiving|Timestamps:]]
|
*00:00, 03:00, 06:00, 09:00, 12:00, 15:00, 18:00, 21:00 GMT
**Timestamps represent instantaneous ("snapshot") values every 3 hours.
|}


'''''List of MERRA-2 data fields in this file type:'''''

{| border=1 cellspacing=0 cellpadding=5 
|- bgcolor="#CCCCCC"
!width="100px"|Field
!width="80px"|Units
!width="100px"|[[MERRA-2#MERRA-2_data_file_collections|Collection]]
!width="300px"|Standard name
!width="300px"|Notes
!width="200px"|Where used in GEOS-Chem?

|-valign="top"
|PS
|hPa
|inst3_3d_asm_Nv
|surface_pressure
|
*We keep the original units of Pa
*We convert Pa -> hPa when reading the PS field in GEOS-Chem.
|
*Advection 
*Many other locations

|-valign="top"
|PV
|K m<sup>2</sup> kg<sup>-1</sup> s<sup>-1</sup>
|inst3_3d_asm_Nv
|ertels_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

|-valign="top"
|QV
|kg kg<sup>-1</sup> 
|inst3_3d_asm_Nv
|specific_humidity
|In GEOS-Chem:
*QV at time t is converted to g/kg and saved into <tt>State_Met%SPHU1</tt>;
*QV at time t+3hr is converted to g/kg and saved into <tt>State_Met%SPHU2</tt>;
*QV is then interpolated to the current time.
|
*Chemistry
*Wet deposition
*PBL mixing

|-valign="top"
|T
|K
|inst3_3d_asm_Nv
|air_temperature
|In GEOS-Chem:
*T @ time t is saved into <tt>State_Met%TMPU1</tt>;
*T @ time t+3h is saved into <tt>State_Met%TMPU2</tt>;
*T is then interpolated to the current time.
|
*Many locations

|}

--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:56, 3 August 2015 (UTC)