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MERRA-2 Version imprimable
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MERRA-2
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Page 4 sur 7
 

Available parameters

surface constant parameters (2D parameters):

PHIS - surface geopotential height (m2/s2)
SGH - standard deviation of topography for gravity wave drag (m)
FRLAKE - fraction of lake type in grid box (fraction)
FRLAND - fraction of land type in grid box (fraction)
FRLANDICE - fraction of land ice type in grid box (fraction)
FROCEAN - fraction of ocean in grid box (fraction)
AREA - horizontal area of grid box (m2)

surface (2D parameters)

 The parameters in blue are those extracted  the original M2T1NXFLX dataset full list below:

Variable Name

Description

Units

EFLUX Latent heat flux (positive upward) W m-2
EVAP Surface evaporation kg m-2s-1
HFLUX Sensible heat flux (positive upward) W m-2
TAUX Eastward surface wind stress N m-2
TAUY Northward surface wind stress N m-2
TAUGWX Eastward gravity wave surface stress N m-2
TAUGWY Northward gravity wave surface stress N m-2
PBLH Planetary boundary layer height m
DISPH Displacement height m
BSTAR Surface buoyancy scale m s-1
USTAR Surface velocity scale m s-1
TSTAR Surface temperature scale K
QSTAR Surface humidity scale kg kg-1
RI Surface Richardson number nondimensional
Z0H Roughness length, sensible heat m
Z0M Roughness length, momentum m
HLML Height of center of lowest model layer m
TLML Temperature of lowest model layer K
QLML Specific humidity of lowest model layer kg kg-1
ULML Eastward wind of lowest model layer m s-1
VLML Northward wind of lowest model layer m s-1
RHOA Surface air density kg m-3
CDH Surface exchange coefficient for heat kg m-2s-1
CDQ Surface exchange coefficient for moisture kg m-2s-1
CDM Surface exchange coefficient for momentum kg m-2s-1
CN Surface neutral drag coefficient nondimensional
TSH Effective turbulence skin temperature K
QSH Effective turbulence skin humidity kg kg-1
FRSEAICE Fraction of sea-ice fraction
PRECANV Surface precipitation flux from anvils kg m-2s-1
PRECCON Surface precipitation flux from convection kg m-2s-1
PRECLSC Surface precipitation flux from large-scale kg m-2s-1
PRECSNO  Surface snowfall flux kg m-2s-1
PRECTOT Total surface precipitation flux kg m-2s-1
PGENTOT Total generation of precipitation kg m-2s-1
PREVTOT Total re-evaporation of precipitation kg m-2s-1

  The parameters in blue are those extracted  from the original M2T1NXRAD dataset full list below:

Variable Name

Description

Units

EMIS Surface emissivity fraction
TS Surface skin temperature K
ALBEDO Surface albedo fraction
ALBNIRDF Diffuse beam NIR surface albedo fraction
ALBNIRDR Direct beam NIR surface albedo fraction
ALBVISDF Diffuse beam VIS-UV surface albedo fraction
ALBVISDR Direct beam VIS-UV surface albedo fraction
LWGEM Emitted longwave at the surface W m-2
LWGAB Absorbed longwave at the surface W m-2
LWGABCLR Absorbed longwave at the surface with no clouds W m-2
LWGABCLRCLN Absorbed longwave at the surface with no clouds or aerosol W m-2
LWGNT Net downward longwave flux at the surface W m-2
LWGNTCLR Net downward longwave flux at the surface for cloud-free sky W m-2
LWGNTCLRCLN Net downward longwave flux at the surface for clear sky W m-2
LWTUP Upward longwave flux at top of atmosphere (TOA) W m-2
LWTUPCLR Upward longwave flux at TOA assuming clear sky W m-2
LWTUPCLRCLN Upward longwave flux at TOA assuming clear clean sky W m-2
SWTDN TOA incident shortwave flux W m-2
SWGDN Surface incident shortwave flux W m-2
SWGDNCLR Surface incident shortwave flux assuming clear sky W m-2
SWGNT Surface net downward shortwave flux W m-2
SWGNTCLR Surface net downward shortwave flux assuming clear sky W m-2
SWGNTCLN Surface net downward shortwave flux assuming clean sky W m-2
SWGNTCLRCLN Surface net downward shortwave flux assuming clear clean sky W m-2
SWTNT TOA net downward shortwave flux W m-2
SWTNTCLR TOA net downward shortwave flux assuming clear sky W m-2
SWTNTCLN TOA net downward shortwave flux assuming clean sky W m-2
SWTNTCLRCLN TOA net downward shortwave flux assuming clear clean sky W m-2
TAUHGH Optical thickness of high clouds dimensionless
TAULOW Optical thickness of low clouds dimensionless
TAUMID Optical thickness of mid-level clouds dimensionless
TAUTOT Optical thickness of all clouds dimensionless
CLDHGH High-level (above 400 hPa) cloud fraction fraction
CLDLOW Low-level (1000-700 hPa) cloud fraction fraction
CLDMID Mid-level (700-400 hPa) cloud fraction fraction
CLDTOT Total cloud fraction fraction

 

The parameters in blue are those extracted from the original M2T1NXSLV dataset full list below: 

Variable Name

Description

Units

SLP Sea level pressure Pa
PS Time averaged surface pressure Pa
U850 Eastward wind at 850 hPa m s-1
U500 Eastward wind at 500 hPa m s-1
U250 Eastward wind at 250 hPa m s-1
V850 Northward wind at 850 hPa m s-1
V500 Northward wind at 500 hPa m s-1
V250 Northward wind at 250 hPa m s-1
T850 Temperature at 850 hPa K
T500 Temperature at 500 hPa K
T250 Temperature at 250 hPa K
Q850 Specific humidity at 850 hPa kg kg-1
Q500 Specific humidity at 500 hPa kg kg-1
Q250 Specific humidity at 250 hPa kg kg-1
H850 Height at 850 hPa m
H500 Height at 500 hPa m
H250 Height at 250 hPa m
OMEGA500 Vertical pressure velocity at 500 hPa Pa s-1
U10M Eastward wind at 10 m above displacement height m s-1
U2M Eastward wind at 2 m above the displacement height m s-1
U50M Eastward wind at 50 m above surface m s-1
V10M Northward wind at 10 m above the displacement height m s-1
V2M Northward wind at 2 m above the displacement height m s-1
V50M Northward wind at 50 m above surface m s-1
T10M Temperature at 10 m above the displacement height K
T2M Temperature at 2 m above the displacement height K
QV10M Specific humidity at 10 m above the displacement height kg kg-1
QV2M Specific humidity at 2 m above the displacement height kg kg-1
TS Surface skin temperature K
DISPH Displacement height m
TROPPV PV based tropopause pressure Pa
TROPPT T based tropopause pressure Pa
TROPPB blended tropopause pressure Pa
TROPT Tropopause temperature K
TROPQ Tropopause specific humidity kg kg-1
CLDPRS Cloud-top pressure Pa
CLDTMP Cloud-top temperature K

 

Model level (3D parameters)

  The parameters in blue are those extracted  from the original M2I3NVASM dataset full list: 

Variable Name

Dims

Description

Units

PS 2D Surface pressure Pa
OMEGA
 3D Vertical pressure velocity
 Pa s-1
T 3D Air temperature K
U 3D Eastward wind component m s-1
V 3D Northward wind component m s-1
QV 3D Specific humidity kg kg-1
QI 3D mass fraction of cloud ice water kg kg-1
QL 3D mass fraction of cloud liquid water kg kg-1

 



Dernière mise à jour : ( 30-03-2017 )
 
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