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.
Work in progress (temporary)
Useful links:
- UERRA parameters
- GRIB-API parameter database
- how is soil moisture defined for TIGGE
- example of soil layers in MARS
- description of multi-layer definition in MARS
- radiation in MARS
- latest WMO documentation on GRIB2 tables (normally it is under 1st link returned by google for "WMO latest")
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)
Model level parameters
Output of analyses on model levels are stored up to a height of about 15km every six hours (at 00/06/12/18UTC).
It was agreed that hybrid level 105 from the WMO list below should be used for all UERRA origins.
- 104 Sigma level
- 105 Hybrid level
- 111 Eta level
- 113 Logarithmic hybrid level
- 118 Hybrid height level
- 119 Hybrid pressure level
- 150 Generalized vertical height coordinate
| Name | Abbreviation | Unit |
| Cloud cover | ccl | % |
| Pressure | pres | Pa |
| Specific cloud liquid water content | clwc | kg kg-1 |
| Specific cloud ice water content | ciwc | kg kg-1 |
| Specific humidity | q | kg kg-1 |
| Temperature | t | K |
| U-velocity | u | m s-1 |
| V-velocity | v | m s-1 |
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
| Name | Abbreviation | Unit |
| Cloud cover | ccl | % |
| Geopotential height | gh | gpm |
| Specific cloud liquid water content | clwc | kg kg-1 |
| Specific cloud ice water content | ciwc | kg kg-1 |
| Relative humidity | r | % |
| Temperature | t | K |
| U-velocity | u | m s-1 |
| V-velocity | v | m s-1 |
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
| Name | Abbreviation | Unit |
| Cloud cover | ccl | % |
| Pressure | pres | Pa |
| Specific cloud liquid water content | clwc | kg kg-1 |
| Specific cloud ice water content | ciwc | kg kg-1 |
| Relative humidity | r | % |
| Temperature | t | K |
| Wind speed | ws | m s-1 |
| Wind direction | wdir | degree true |
Surface level parameters
Time steps:
Analysis:
● Store analysis output in six hourly intervals (at 00/06/12/18UTC) for the Unified Model, Harmonie, MESCAN
● Store hourly analysis output for COSMO, MESAN, SURFEX
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
Soil level parameters
Time steps: the same as surface level parameters
Soil | Abbreviation | Unit |
|---|---|---|
| Liquid non-frozen volumetric soil water | liqvsm | m3 m-3 |
| vsw | m3 m-3 | |
| Soil heat flux | sohf | W m-2 |
| st | K | |
| Soil depth | sod | m |
Remarks: ??? should be reviewed by GRIB-API team