GRIB-API definition
| Name: | specific humidity | Abbreviation: | q | Unit: | kg kg-1 | paramId: | 133 |
UERRA details
| Definition | The mass of water vapour per unit mass of air, including the water vapour on a model level. |
| Validity | instantaneous |
| Comment |
WMO GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | 0 | meteorological products |
| Parameter Category | 1 | moisture |
| Parameter Number | 0 | specific humidity |
| Level | ||
|---|---|---|
| Type of first fixed surface | 105 | hybrid level |
| Scale factor of first fixed surface | 0 | |
| Scaled value of first fixed surface | model level number | |
| Type of second fixed surface | all bits to 1 | missing |
| Scale factor of second fixed surface | all bits to 1 | missing |
| Scaled value of second fixed surface | all bits to 1 | missing |
2 Comments
Richard Mladek
Specific humidity archiving is required at the moment only on model levels. On height and pressure level relative humidity is required. Is it correct?
Per Unden
Yes, that is what we have proposed so far, unless there are strong reasons to have both (=wasteful). RH is say more user friendly whereas model levels are more for the experts.