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Soil moisture top 100 cm
Name: | soil_moisture top 100 cm | Abbreviation: | sm100 | Unit: | kg m-3 |
Definition | The volumetric soil moisture on the top 100cm of the soil layer. |
Validity | Daily 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. |
GRIB 2 | Discipline | = 2 | | | Parameter Category | = 0 | | | Parameter Number | = 22 | | | Type of first fixed surface | = 106 | Type of second fixed surface | = 106 | Scale factor of first fixed surface | = 0 | Scale factor of second fixed surface | = 1 | Scaled value of first fixed surface | = 0 | Scaled value of second fixed surface | = 10 |
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GRIB 2 and C-code for: Perturbed forecast, Control forecast, Perturbed re-forecast and Control re-forecast |