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GRIB-API definition

NameLiquid volumetric soil moisture (non-frozen)
AbbreviationliqvsmUnitm3 m-3paramId:260210

 

UERRA details

DefinitionLiquid non-frozen volumetric soil moisture on a soil layer.
Validityinstantaneous
Comment

This parameter is to be produced only by Meteo-France

 Sea points should be set as missing values.

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 category3soil products
Parameter number10
liquid volumetric soil moisture (non-frozen)
Level (Meteo-France only)
Type of first fixed surface106depth below land surface (m)
Scale factor of first fixed surface0 
Scaled value of first fixed surface0 
Type of second fixed surface106 or 167***
"depth below land surface (m)" or "bottom of root zone"***
Scale factor of second fixed surface1 or all bits to 1***(cm) or missing***
Scaled value of second fixed surfacevalue in cm or all bits to 1***1 or missing***

*** valid for the 3rd Meteo-France layer (from surface to the bottom of root zone)

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