[MITgcm-cvs] MITgcm/pkg/seaice CVS Commit

[Torge Martin,,,]

Update of /u/gcmpack/MITgcm/pkg/seaice
In directory forge:/tmp/cvs-serv18720

Modified Files:
	SEAICE_OPTIONS.h seaice_diagnostics_init.F seaice_growth.F 
	seaice_init_fixed.F seaice_tracer_phys.F 
Log Message:
Introducing a new parameterization for grease ice, 
 i.e. newly formed sea ice in open water:

What it does:
 The grease ice parameterization delays formation of solid 
 sea ice from frazil ice by a time constant and provides a 
 dynamic calculation of the initial solid sea ice thickness 
 HO as a function of winds, currents and available grease ice 
 volume. Grease ice does not significantly reduce heat loss 
 from the ocean in winter and area covered by grease is thus 
 handled like open water.
 (for details see Smedsrud and Martin, 2014, Ann.Glac.)

How to use:
- enable SEAICE_GREASE in SEAICE_OPTIONS.h
- set SItrName(1) = 'grease' in namelist SEAICE_PARM03 in data.seaice
  then output SItr01 is SItrNameLong(1) = 'grease ice volume fraction',
  with SItrUnit(1) = '[0-1]', which needs to be multiplied by SIheff
  to yield grease ice volume. 
- additionally, the actual grease ice layer thickness 
  (diagnostic SIgrsLT) can be saved.