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| Table of Contents |
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1. New short-wave radiation parameters
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| Parameter | Units | Description |
|---|---|---|
Downward short-wave radiation flux, clear sky | W mWm-2 | Downward short-wave radiation flux computed under actual atmospheric conditions but assuming zero cloudiness. |
| Upward short-wave radiation flux, clear sky | W mWm-2 | Upward short-wave radiation flux computed under actual atmospheric conditions but assuming zero cloudiness. |
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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.
2. New long-wave radiation parameter
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| Parameter | Units | Description |
|---|---|---|
Downward long-wave radiation flux, clear sky | W mWm-2 | Downward long-wave radiation flux computed under actual atmospheric conditions but assuming zero cloudiness. |
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| Parameter | Units | Description |
|---|---|---|
Soil heat flux | W mWm-2 | The soil heat flux is the energy receive by the soil to heat it per unit of surface and time. The Soil heat flux is positive when the soil receives energy (warms) and negative when the soil looses energy (cools). |
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 Percolation
Proposed parameter for:
- Product discipline 2 - Land surface products, parameter category 0: vegetation/biomass (???
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- ) (following the current logic where to find similar hydrological outputs coming probably from meteorological models)
- Product discipline 1 - Hydrological products, parameter category 0: hydrology basic products (???) (proposed by Frederic)
| Parameter | Units | Description | |
|---|---|---|---|
Percolation rate | kg mkgm-2 | s-1 | The newly proposed percolation is the downward movement of water under hydrostatic pressure in the saturated zone.This water might still end up in rivers and lakes as discharge but it is a slower process than water runoff or drainage. Such defined percolation is an input for hydrological models together with e.g. water runoff. |
Question: Do we need to ask also for another already accumulated parameter "Percolation" [kgm-2] as some model are producing it and they would have to convert it into the rate?
Justification: The newly proposed percolation is the downward movement of water under hydrostatic pressure in the saturated zone.This water might still end up in rivers and lakes as discharge but it is a slower process than water runoff or drainage. Such defined percolation is an input for hydrological models together with e.g. water runoff. If percolation is to the ground water it can also be named as ground water recharge.
Real-life example:
The newly proposed percolation rate what be the parameter K3 in the SURFEX 3-layers scheme (right picture ISBA 3-L; it is called gravitational drainage there).
5. Soil levels
Newly proposed type of level soil level for Code table 4.5-Fixed surface types and units
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