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Description of the upgrade
A modification of the surface scheme was implemented in order to correct some of the deficiencies of 2m temperature forecast.
- The root profile was adjusted. The values of the root percentage in each of the 2 soil layers are now 50% (15%) surface layer, 50% (70%) intermediate layer and a 0% (15%) in the climate layer (percentage values within the brackets are valid for the old scheme). In the absence of precipitation no root extraction is allowed from the climate reservoir.
- The background vegetation cover in dry situations was changed. No plant transpiration is allowed if the soil wetness in the root zone is lower than a threshold value. The background vegetation cover is riot decreased linearly to 0 when the root soil wetness decreases to 0.
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Implemented: 22 November 1988 |
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