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NameVolumetric soil moistureAbbreviationvswUnitm3 m-3paramId:260199

 

UERRA details

DefinitionVolumetric soil moisture of a soil layer.
Validityinstantaneous
Comment

Sea points should be set as missing values (encoded as bitmap). Soil layers must always start from 1 (0 soil level is the surface by default which is not encoded).

To interpret 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.

 

WMO GRIB2 definition

Parameter
Discipline2land surface products
Parameter category0vegetation/biomass
Parameter number25volumetric soil moisture

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