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'NIL' : no radiation scheme (default)
'NEWRAD' : complete radiation scheme
'CCCMARAD' : most advanced radiation scheme
'CCCMARAD2': most advanced radiation scheme v2
When 'cccmarad2' is chosen, one should also set the following parameters to .true.:
!# Use climatological values of GHG in radiation (CCCMARAD2 only)
logical :: radghg_L =.false.
!# Use LINOZ prognostic Ozone in radiation (CCCMARAD2 .and. LINOZ only)
logical :: rad_linoz_L =.false.
Roughness length
Limit ice /snow
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