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Proposed parameters for Product discipline 0 - Meteorological products, parameter category 4: short-wave radiation
| Parameter | Units | Description | ||||||
|---|---|---|---|---|---|---|---|---|
Downward short-wave radiation flux, clear sky | W m-2 | Downward short-wave radiation flux computed under actual atmospheric conditions but assuming zero cloudiness. | ||||||
| Upward short-wave radiation flux, clear sky | W m-2 | Direct | Upward short-wave radiation flux | added by WMO last week! | computed under actual atmospheric conditions but assuming zero cloudiness. |
Question: What about "Direct short-wave radiation flux, clear sky" produced by IFS and archived in MARS under paramId 228022 (Clear-sky direct solar radiation at surface)
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| Parameter | Units | Description |
|---|---|---|
Downward long-wave radiation flux, clear sky | W m-2 | Downward long-wave radiation flux computed under actual atmospheric conditions but assuming zero cloudiness. |
Justification: The proposed parameters are commonly computed by numerical weather prediction models and operationally archived. They are of the same type like ones already existing in WMO code tables (e.g. Downward short-wave radiation flux, Net short-wave radiation flux, clear sky). Additional information illustrating their meaning and handling can be checked in the attached document about radiation quantities in the IFS model developed by ECMWF.
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Justification: The heat flux is currently defined only under Product discipline 2 - Land surface products, parameter category 0: vegetation/biomass. The currently existing parameters in the same category related to soil are mostly deprecated and moved to the category 3: soil products where the soil heat flux is not defined at all.
4. Percolation
Proposed parameter for Product discipline 2 - Land surface products, parameter category 0: vegetation/biomass (???) Fredrik Wetterhall would rather suggest Discipline 1, category 0
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| Type of Level | Units | Description |
|---|---|---|
Soil level | - | This level represents a soil model level (similar to hybrid model level above surface). The scaled value encoded together with this new type of level represents the level number. The aim of this type of the level is to encode a soil level that has not a constant depth across the model domain (each grid cell has soil levels of different depths). The non-constant depth is then encoded as a parameter on this type of level alongside the other parameters like temperature, soil moisture, etc. A "soil layer" (useful to encode volume integrated parameters) can be represented by defining 2 soil model levels using the usual GRIB2 mechanism ("first fixed surface/second fixed surface" where the deepest soil level is always encoded as the second fixed surface). |
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