Evaluating modifications of the soil module TERRA. Felix Ament, MeteoSwiss. COSMO General Meeting, September 2007. Dry soil moisture bias. OPRerational COSMO, two-layer version. Testsuite, multi-layer version. Soil moisture. T2m. Strong dry out bias!. Negative effect on T2m forecast.
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Evaluating modifications of the soil module TERRA
COSMO General Meeting, September 2007
OPRerational COSMO, two-layer version
Meteorological Forcing: T, p, u, q, Qdown
Working in the dark – nearly no or insufficient observations!
Features of “Nudged Multilayer”:
Nudged multilayerOperational 2-layer
Features of “CTL standalone”:
Problem: Definition of soil moisture gradient at top of water
Solution: Solve Darcy equation with these simplifications:
Rawls and Brakensiek, 1989
Parameterization (adopted from VEG3d, e.g. Braun 2002)
mit Fmax=10 und Qmin=0.5.
External vegetation parameters prescribed by ECOCLIMAP dataset (Mason et al., 2002):
(all maps are valid for July)
Local roughness length z0,local
Very high roughness length over mountainous areas.
Top Layer SM at Lindenberg
Dickinson, 1984: BATS scheme
Designed for a two layer soil module!
Noilhan and Platon, 1989 (NP89): ISBA scheme, Meso-NH
Deviations in mm