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DefinitionThe volumetric soil moisture on the top 20cm of the soil layer.
ValidityinstantaneousDaily mean
Comment

Computed from instantaneous values at 00. 06, 12 and 18Z

To interprete soil moisture and to compare different models the Soil Wetness Index (SWI) is used:

SWI = (soil_moisture - wilting_point) / (field_capacity - wilting_point).

Field capacity corresponds to the maximum value that the model can sustain without precipitation for more than a few hours. The vegetated fraction of the soil evaporates at the maximum rate for soil moisture larger than field capacity and stops evaporating below the permanent wilting point, with a continuous variation between the two extremes.
All Partners are asked to provide the wilting point and the field capacity for each grid point.Computed from instantaneous values

GRIB 2
Discipline= 2  
Parameter Category= 0  
Parameter Number= 22  
Type of first fixed surface= 106Type of second fixed surface= 106
Scale factor of first fixed surface= 0Scale factor of second fixed surface= 1
Scaled value of first fixed surface= 0Scaled value of second fixed surface= 2
GRIB 2 and C-code for: Perturbed forecast, Control forecast, Perturbed re-forecast and Control re-forecast

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