| Jörg Urban | The ECMWF runs a uniform soil scheme, where the wilting point = 170 kg/m**3, the field capacity = 320 kg/m**3 and the saturation = 470 kg/m**3 are globaly constant. Please note, using the GRIB 2 unit the three values read wilting point = 0.17, field capacity = 0.32 and saturation = 0.47.
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 moisture is then computed:
sm = ( 7 * Theta_1 + 13 * Theta_2 )/20,
where Theta_i are the averaged volumetric soil moistures on the i-th level.
Joint Meeting of CT-MTDCF/ET-DRC, Montreal, 8-12 May 2006: accepted parameter number 22. Image Removed  Image Removed |