Radiative transfer schemes

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There are different radiative schemes that can be used in LMDZ:

  • the "legacy" (oldest) radiative scheme: always available. May be selected using the iflag_rrtm=0 option in physiq.def. Note that this schemes also requires using 2 bands in the SW (Short Wave, i.e. visible wavelengths), i.e. setting NSW=2 in physiq.def
  • RRTM, selected with iflag_rrtm=1 (and requiring that NSW=6), which will be available if the GCM was compiled with the -rad rrtm option (see WhatIs: The makelmdz fcm script).
  • ECRAD (implementation is ongoing at the time of writing this) , selected with iflag_rrtm=2, which will be available if the GCM was compiled with the -rad ecrad option.

05/07/2022