You report a hard problem in COSMO also related to soil physics, dynamics in the boundary layer and convection parameterization. (Are you using deep convection parameterization?)
The relevance of the land surface scheme has been analysed by Jan-Peter Schulz:
1. Missing dependency of the heat conductivity on the soil water content.
The option dependency on soil water content (after Johansen, 1975) introduced in cosmo_1.14 increases the daily temperature range by 2K over northern Africa.
2. Missing vegetation layer with own temperature
TERRA has no vegetation layer above ground. This is a further reason for too high night temperatures.
Hereto a publication is submitted. Please contact Jan-Peter Schulz ( DWD ) for more details.
The Land Surface Schemes Veg3D ( KIT Karlsruhe, Breil) and CLM ( ETH Zürich, Davin) can be used alternatively.
Greetings, Andreas Will
You report a hard problem in COSMO also related to soil physics, dynamics in the boundary layer and convection parameterization. (Are you using deep convection parameterization?)
The relevance of the land surface scheme has been analysed by Jan-Peter Schulz:
1. Missing dependency of the heat conductivity on the soil water content.
The option dependency on soil water content (after Johansen, 1975) introduced in cosmo_1.14 increases the daily temperature range by 2K over northern Africa.
2. Missing vegetation layer with own temperature
TERRA has no vegetation layer above ground. This is a further reason for too high night temperatures.
Hereto a publication is submitted. Please contact Jan-Peter Schulz ( DWD ) for more details.
The Land Surface Schemes Veg3D ( KIT Karlsruhe, Breil) and CLM ( ETH Zürich, Davin) can be used alternatively.
Greetings, Andreas Will