[MITgcm-support] Prescribed atmospheric temperatures and freshwater flux with exf/seaice/thsice packages

[Martin Losch]

Sandy,

EXF_OPTIONS.h has a list of possible combinations of flags (and hence forcing fields). The “generic” combination for using pkg/seaice (or/and thsice) is option (3), define ALLOW_ATM_TEMP, ALLOW_DOWNWARD_RADIATION, ALLOW_BULKFORMULAE. evap (and sflux=EmPmR=evap-precip-runoff) is then computed from the bulkformulae. The reason is that over ice, the fluxes are modfied by the sea ice, and e.g. EmPmR is changed according to freezing and melting (and sublimation) of ice.

In addition to option (3), you can define EXF_READ_EVAP and provide precip and evap together with the seaice model, but not with the thsice thermodynamics, see thsice_get_exf.F: 
#ifdef EXF_READ_EVAP
      STOP 'ABNORMAL END: S/R THSICE_GET_EXF: EXF_READ_EVAP defined'
#endif /* EXF_READ_EVAP */

Martin

> On 25. Oct 2017, at 00:26, <Sandy.Gregorio at uqar.ca> <Sandy.Gregorio at uqar.ca> wrote:
> 
> Hi everyone,
> 
> I want to use EXF/SEAICE and THSICE packages and prescribed atmospheric temperatures, net freshwater flux and surface winds. In EXF_OPTIONS.h, I 'defined' ALLOW_ATM_TEMP to read my atmospheric temperatures.
> 
> When I run my config, I have a warning message: ** WARNING ** EXF_CHECK: "sflux" field is loaded from file but not used within pkg/exf
> 
> Is it possible to use EXF with atmospheric temperature and freshwater flux or do I need to prescribed precipitation and evaporation to compute my freshwater flux ? I want EXF to compute the net heat flux and to read the net freshwater flux but I wonder if it is possible, and if not, what could be an alternative.
> 
> Thanks in advance for your help!
> 
> Sandy
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