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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 :
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Product discipline 1 - Hydrological products, parameter category 0: hydrology basic products
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| Parameter | Units | Description |
|---|---|---|
Percolation rate | kgm-2s-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. This parameter is proposed as a rate rather than the accumulated one following WMO approach in such cases. The accumulated value can be still encoded using it with accumulation specified in PDT. |
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.
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).
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