First attempt, of 2017-09-05

The specifics of the order to CLM (Climate Limited-Area Modeling Community) emulate, as mentioned above, the COSMO-DE domain specs from the coarse data, but also the resolution of a test file of fine external data:
export:data_oasis3/ann/lfff00000000c400m.nc
Because this file does not provide its dlon and dlat in the rotated coordinates which CLM (Climate Limited-Area Modeling Community) understands, the settings are meant to reproduce its resolution in terms of points per area. The new settings are:

  startlat_tot  =  -5          ,
  startlon_tot  =  -5          ,
  origin lat    =  50.0   (calculated from pollat        =  40.0),
  origin lon    =  10.0   (calculated from pollon        =-170.0),
  dlon          =   0.004105464,
  dlat          =   0.004105464,
  ie_tot        = 3000         ,
  je_tot        = 3000

These further parameters are not mentioned in the document:“Wrapper for COSMO”, but required by CLM (Climate Limited-Area Modeling Community):

Model version = EXTPAR-4.0.1
pollon=-170
pollat=40
polgam=0
startlon_tot=-5
startlat_tot=-5
oro=1
orofilter=0
landuse=2
soil=1
tcl=1
aot=1
albedo=2
urban=2

The new resolution is 399 m, close to the test file’s 419 m.