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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.
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| title | Work in progress (temporary) |
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Remarks:
- ??? should be reviewed by GRIB-API team
- +++ parameter must be added to GRIB-API
Useful links:
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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)
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).
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
Model level increases with height for MO and decreases for other models.
- COSMO: 1..40
- HARMONIE: 1..65
- MO: 1..63
Pressure level parameters
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● 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.
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● T+1,2,3,4,5,6 started at 06 UTC and 18 UTC
Surface level parameters
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● 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, 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
● 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
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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. |
original name (temporary) | Precipitation and humidity |
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| | | +++TBDDrainage | +++2m relative humidityRunofftcw |
Accumulated radiation fluxes |
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| | | | +++e | +++scsrdClear-sky short-wave downward flux at the surface | +++ scsru Clear-sky short-wave upward flux at the surface | +++
sdsr Direct short-wave radiation flux at the surfaceNet short-wave radiation flux at the surface | Total short-wave radiation flux at the surface +++strcdClear-sky long-wave downward flux at the surfaceNet long-wave radiation flux at the surfaceLong-wave downward flux at the surface |
Temperature and wind speed |
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| | | 10m wind speed | +++10m wind direction | +++10 m wind gust [in the last 24 hrs | ]Surface air maximum temperature +++ | Maximum [1.5 m | 2 m] Surface air minimum temperature +++Minimum [1.5 m | 2 m] temperature since previous post-processing | [1.5 | 2 ] m temperature | Surface temperature | | | | | | | | +++ | +++ | +++ | | | | | sd ??? ??? Water equivalent of accumulated snow depthAccumulated total snowfall | | | | Liquid non-frozen volumetric soil moisture | lvsw | m3 m-3 | Soil water index for the first cm / for 5cm / in the root zone (liquid) |
Volumetric soil water +++ | vsw | m3 m-3 | Volumetric soil water layer 1/2/3/4 (only 3 layers for Meteo-France) |
| Soil heat flux +++ | hflux | W m-2 | |
Soil temperature +++ | st | K | Soil temperature level 1/2/3/4 |
| Soil depth +++ | TBD | m | |
Static fields | | | |
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| Land-sea mask | lsm | (0-1) | Land cover |
| Orography | orog | gpm | |
Surface roughness | sr | m | 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
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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). |
Additional information and links
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)