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Table of Contents

Below is a list of all agreed upon parameters. Participating Centres are expected to produce output fields in GRIB2 data format and with consistent units. All units are defined by the WMO in the GRIB2 manual. For more information please refer to Guide to the WMO Table Driven Code Form.

For the actual availability of UERRA parameters from each model in MARS refer to the page Parameter availability.

Model level parameters

Output of analyses on (hybrid) model levels are stored up to a height of about 15km every six hours (at 00/06/12/18UTC).

Model level increases with height for MO and decreases for other models.

  • COSMO: 1..40
  • HARMONIE: 1..65
  • MO: 1..63
NameAbbreviationUnit
Cloud cover 
cc
ccl%
PressurepresPa
Specific cloud liquid water contentclwckg kg
**
-1
Specific cloud ice water contentciwckg kg
**
-1
PressurepresPa
Specific humidityqkg kg-1
TemperaturetK
U-velocityum s-1
V-velocityvm s-1

Pressure level parameters

...

● Store analysis output in six hourly intervals intervals (at 00 UTC, /06 UTC, 12 UTC, 18 UTC /12/18UTC) for the Unified Model and Harmonie

...

● T+1,2,3,4,5,6 started at 06 UTC and 18 UTC

NameAbbreviationUnit
Cloud cover
cc
ccl%
Geopotential heightghgpm
Geopotentialzm2 s-2
Specific cloud liquid water contentclwckg kg
**
-1
Specific cloud ice water contentciwckg kg
**
-1
Geopotential heighghgpm 
Relative humidity
rh
r%
TemperaturetK
U-velocityum s-1
V-velocityvm s-1

 

...

Height level parameters

Output of forecasts and analyses on pressure levels for defined time steps.

...

● Store analysis output in six hourly intervals  (at 00 UTC, /06 UTC, 12 UTC, 18 UTC /12/18UTC) for the Unified Model and Harmonie

...

● T+1,2,3,4,5,6 started at 06 UTC and 18 UTC

NameAbbreviationUnit
Cloud cover
cc
ccl%
PressurepresPa
Specific cloud liquid water contentclwckg kg
**
-1
Specific cloud ice water contentciwckg kg
**
-1
PressurepresPa
Relative humidity  
rh
r%
TemperaturetK
Wind speedwsm s-1
Wind directionwdir
deg
degree true

Surface level parameters 

...

 

 

 

WORK IN PROGRESS!

 

Potential temperature level parameters

 

The following parameters are available on one potential temperature level  (320 K)

NameAbbreviationUnitFrequency
Potential vorticitypvK m2 kg-1 s-1Instantaneous once a day (00Z)

...

 

...

 


Time steps:

Analysis:

● Store analysis output in six hourly intervals (at 00/06/12/18UTC) for the Unified Model, Harmonie, MESCAN-SURFEX

● Store precipitation analysis  (24 h accumulation from 06 UTC to 06 UTC of next day) output at 06TC for MESCAN-SURFEX

● Store hourly analysis output for COSMO, MESAN

Forecast:

● Store forecast output at T+1,2,3,4,5,6,9,12,15,18,21,24,27,30 started at 00 UTC and 12 UTC for the Unified Model, COSMO

● Store forecast output at T+1,2,3,4,5,6 started at 06 UTC and 18 UTC for the Unified Model, COSMO

● For Harmonie (started at 00/06/12/18UTC):

      • Store sd, sr, al, rsn, slhf, sshf parameters (derived from ALADIN model driving SURFEX) at T+1,2,3,4,5,6 only
      • Store all other parameters at T+1,2,3,4,5,6,9,12,15,18,21,24,27,30

● For MESCAN-SURFEX (started at 00/06/12/18UTC):

      • Store parameters sp,tp,2r,2t,10si,10wdir, tidirswrf from  forecast output at T+6 only (fields from ALADIN model driving SURFEX)
      • Store all other parameters from forecast output at T+1,2,3,4,5,6


Info
titleStatic fields

Static fields are archived only as of the analysis type. For users' convenience, even they are invariant fields, they should be archived for all analysis output times. In case of ensemble products they should be archived with all ensemble members (again as of the analysis type only).

The surface roughness could be either static or changing parameter depending on model and  should be handled accordingly as a static or a prognostic model field.

...


NameAbbreviationUnit
Frequency10 metre u-velocity10um s-1Instantaneous once a day (00Z)10 metre v-velocity10vm s-1Instantaneous once a day (00Z)CAPEcapeJ kg-1Daily averagedSkin temperaturesktKDaily averaged

Precipitation and humidity



Percolation 
perckg m-2
Surface air relative humidity
2r%
Surface runoff  
srokg m-2
Total column water vapourtciwv
Snow depth water equivalentsd
kg m-2
Daily averaged Snow density          
Total precipitation tp
rsn
kg m-
3Daily averagedSnow fall water equivalentsfkg m-
2

Accumulated

, archived every 24 hours

radiation fluxes



Albedoal
Snow albedo          
 asn
%
Daily averaged Soil moisture top 20cm sm20
kg m-3 Daily averaged Soil moisture top 100 cm sm100kg m-3 Daily averaged Soil temperature top 20 cm st20KDaily averaged Soil temperature top 100 cm st100KDaily averagedSurface air maximum temperaturemx2t6K6-hourly
Surface air minimum temperaturemn2t6K6-hourly
Surface air temperature2tKDaily averaged Surface air dewpoint temperature 2d2dDaily averaged Sea surface temperature  
wtmpKDaily averaged Sea ice cover   ciproportionDaily averagedSurface pressurespPaInstantaneous once a day (00Z)Time-integrated top net thermal radiationttr
Evaporationevakg m-2
Time-integrated surface latent heat fluxslhfW m-2 s
Accumulated, archived every 24 hours
Time-integrated surface
latent
sensible heat flux
slhf
sshfW m-2 s
Accumulated, archived every 24 hours
Time-integrated surface
net
clear-sky solar radiation downwards
ssr
adswrf_csW m-2 s
Accumulated, archived every 24 hours
Time-integrated surface
net thermal radiationstr
clear-sky solar radiation upwards auswrf_cs W m-2 s
Accumulated, archived every 24 hours

Time-integrated surface

sensible heat fluxsshf

direct solar radiation

tidirswrfW m-2 s
Accumulated, archived every 24 hours
Time-integrated surface net solar radiation
downwards
ssrd 
ssrW m-2 s
Accumulated, archived every 24 hours
Time-integrated surface
thermal
solar radiation downwards
strd
ssrdW m-2 s
Accumulated, archived every 24 hours Total cloud cover tcc%Daily averaged Total column water tcwkg m -2 Daily averaged Total precipitation tpkg m-2 Accumulated, archived every 24 hours 6-hourly  Convective precipitation *
cpkg m-2 Accumulated, archived every 24 hours Northward turbulent surface stress  *
nsssN m-2 sAccumulated, archived every 24 hours Eastward turbulent surface stress  * ewssN m-2 sAccumulated, archived every 24 hours Mean sea-level pressure mslPaInstantaneous once a day (00Z)Water runoff and drainage   * 
rokg m-2 Accumulated, archived every 24 hours Surface water runoff    *
srokg m-2 Accumulated, archived every 24 hoursLand sea masklsmProportion of land

Instantaneous once a day (00Z)

Only control forecast

Orographyoroggpm

Instantaneous once a day (00Z)

Only control forecast

Soil type  sltCategorical

Instantaneous once a day (00Z)

Only control forecast

 

 

 

 

 

 

 

Potential temperature level parameters

 

The following parameters are available on one potential temperature level  (320 K)

NameAbbreviationUnitFrequency
Potential vorticitypvK m2 kg-1 s-1Instantaneous once a day (00Z)

 

Single-level parameters

 

The following parameters are available on single levels

NameAbbreviationUnitFrequency10 metre u-velocity10um s-1Instantaneous once a day (00Z)10 metre v-velocity10vm s-1Instantaneous once a day (00Z)CAPEcapeJ kg-1Daily averagedSkin temperaturesktKDaily averaged
Time-integrated surface clear-sky thermal radiation downwardsadlwrf_csW m-2 s
Time-integrated surface net thermal radiation
strW m-2 s
Time-integrated surface thermal radiation downwards
strdW m-2 s

Temperature and wind speed



10 metre wind speed10sim s-1
10 metre wind direction10wdirdegree true
10 metre wind gust since previous post-processing 
10fgm s-1
Surface air maximum temperature since previous post-processingmx2tK
Surface air minimum temperature since previous post-processingmn2tK
Surface air temperature2tK
Skin temperature sktK

Pressure/Height



Mean sea level pressuremslPa
Surface pressurespPa

Cloud properties



High cloud coverhcc%
Low cloud coverlcc%
Medium cloud covermcc%
Total cloud covertcc%

Snow



Snow densityrsnkg m-3
Snow depthsdem
Snow depth water equivalentsdkg m-2
Daily averaged Snow density          
rsnkg m-3
Daily averaged
Snow fall water equivalentsfkg m-2

Accumulated, archived every 24 hours

Snow albedo          
 asn
%Daily averaged

Soil

moisture top 20cmsm20
kg m-3 Daily averaged Soil moisture top 100 cm sm100kg m-3 Daily averaged Soil temperature top 20 cm st20KDaily averaged Soil temperature top 100 cm st100KDaily averagedSurface air maximum temperaturemx2t6K6-hourly
Surface air minimum temperaturemn2t6K6-hourly
Surface air temperature2tKDaily averaged Surface air dewpoint temperature 2d2dDaily averaged Sea surface temperature  
wtmpKDaily averaged Sea ice cover   ciproportionDaily averagedSurface pressurespPaInstantaneous once a day (00Z)Time-integrated top net thermal radiationttrW m-2 sAccumulated, archived every 24 hoursTime-integrated surface latent heat fluxslhfW m-2 sAccumulated, archived every 24 hoursTime-integrated surface net solar radiationssrW m-2 sAccumulated, archived every 24 hoursTime-integrated surface net thermal radiationstrW m-2 sAccumulated, archived every 24 hours Time-integrated surface sensible heat flux sshfW m-2 sAccumulated, archived every 24 hours Time-integrated surface solar radiation downwards ssrd W m-2 sAccumulated, archived every 24 hours Time-integrated surface thermal radiation downwards strdW m-2 sAccumulated, archived every 24 hours Total cloud cover tcc%Daily averaged Total column water tcwkg m -2 Daily averaged Total precipitation tpkg m-2 Accumulated, archived every 24 hours 6-hourly  Convective precipitation *
cpkg m-2 Accumulated, archived every 24 hours Northward turbulent surface stress  *
nsssN m-2 sAccumulated, archived every 24 hours Eastward turbulent surface stress  * ewssN m-2 sAccumulated, archived every 24 hours Mean sea-level pressure mslPaInstantaneous once a day (00Z)Water runoff and drainage   * 
rokg m-2 Accumulated, archived every 24 hours Surface water runoff    *
srokg m-2 Accumulated, archived every 24 hoursLand sea masklsmProportion of land

Instantaneous once a day (00Z)

Only control forecast

Orographyoroggpm

Instantaneous once a day (00Z)

Only control forecast

Soil type  sltCategorical

Instantaneous once a day (00Z)

Only control forecast



Soil heat fluxsohf
W m-2

Static fields



Land-sea masklsm(0-1)
Orographyoroggpm
Surface roughnesssrm

Soil level parameters 

Time steps: the same as surface level parameters

Soil levels: parameters should be provided on original model levels or layers

  • COSMO: 8 soil layers
    level borders at 0, 0.01, 0.03, 0.09, 0.27, 0.81, 2.43, 7.29, 21.87 m
  • HARMONIE: 3 soil levels/layers (sot on levels, vsw on layers)
    level depths are grid dependent
  • MESCAN-SURFEX: 14 soil layers (only 6 layers for preliminary shorter re-analysis runs)
    level borders at 0, 0.01, 0.04, 0.1, 0.2, 0.4, 0.6 m 
  • MO: 4 soil layers
    level borders at  0, 0.1, 0.35, 1 and 3 m
Info
titleSoil depth

The soil depth could be either a constant or a grid dependent parameter depending on given model soil scheme.

If constant, the soil depths should be mentioned only in documentation of given model.

If grid dependent it should be archived the same as other static fields for all analysis output times. In case of ensemble products it should be archived with all ensemble members (again as of the analysis type only).


Soil

AbbreviationUnit
Liquid non-frozen volumetric soil waterliqvsmm3 m-3

Soil temperature

sotK
Soil depthsodm
Volumetric field capacity voltsom3 m-3

Volumetric soil water

vswm3 m-3
Volumetric wilting point   vwiltmm3 m-3

Attached documents to this page which were used for creation of GRIB2 UERRA definitions (they are linked above too):

  • radiation_in_mars.pdf (to understand the radiation fluxes)
  • Parameter_table_20150427.docx (the latest official version of agreed upon UERRA parameters)