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Name:

soil_temperature

Abbreviation:

st

Unit:

K

Definition	The average soil temperature on the top 20cm of the soil layer.
Validity	instantaneous
Comment

GRIB 2

Discipline	= 2
Parameter Category	= 0
Parameter Number	= 2
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	= 2

GRIB 2 and C-code for: Deterministic forecast, Perturbed forecast and Control forecast

Comments

Author	Contents
Jörg Urban	ECMWFs has four soil layers: layer 1 from 0cm to 7cm, layer 2 from 7cm to 28cm, layer 3 from 28cm to 1m and layer 4 from 1m to 2.89m. The parameter soil temperature is then computed: st = ( 7 * T_1 + 13 * T_2 )/20, where T_i are the averaged soil temperatures on the i-th level.