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| Definition | Aerodynamic roughness length (over land). |
| Validity | instantaneous |
| Comment | Archived once a day at 00Z for control forecast and re-forecast, only. |
GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | 2 | land surface products |
| Parameter Category | 0 | vegetation/biomass |
| Parameter Number | 1 | surface roughness |
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