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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

Pressure level parameters

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

Pressure levels [hPa]:

1000, 975, 950, 925, 900, 875, 850, 825, 800, 750, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10

Time steps:

Analysis:

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

● Store analysis output in hourly intervals for COSMO

Forecasts for all models:

● T+1,2,3,4,5,6,9,12,15,18,21,24,27,30 started at 00 UTC and 12 UTC

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

Height level parameters

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

Height levels [m]:

15, 30, 50, 75, 100, 150, 200, 250, 300, 400, 500

Time steps:

Analysis:

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

● Store analysis output in hourly intervals for COSMO

Forecasts for all models:

● T+1,2,3,4,5,6,9,12,15,18,21,24,27,30 started at 00 UTC and 12 UTC

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

Surface level parameters 

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, Harmonie

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

● 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

 

Static 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

Precipitation and humidity

  
Percolation 
perckg m-2
Surface air relative humidity
2r%
Surface runoff  
srokg m-2
Total column water vapourtciwvkg m-2
Total precipitation tpkg m-2

Accumulated radiation fluxes

  
Albedoal%
Evaporationevakg m-2
Time-integrated surface latent heat fluxslhfW m-2 s
Time-integrated surface sensible heat fluxsshfW m-2 s
Time-integrated surface clear-sky solar radiation downwardsadswrf_csW m-2 s
Time-integrated surface clear-sky solar radiation upwards auswrf_cs W m-2 s

Time-integrated surface direct solar radiation

tidirswrfW m-2 s
Time-integrated surface net solar radiation ssrW m-2 s
Time-integrated surface solar radiation downwards ssrdW m-2 s
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
Snow fall water equivalentsfkg m-2

Soil

  
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

Soil 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).

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)

 

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