[MITgcm-devel] non-legacy seaice

[Jean-Michel Campin]

Hi Martin,

Just a short comment: if Gael does not want to answer, you can
always return to SEAICE_GROWTH_LEGACY version, or, as an other
alternative, switch to pkg/thsice thermodynamics as Jeff did.

Cheers,
Jean-Michel

On Mon, Jan 30, 2012 at 12:52:13PM -0500, Jean-Michel Campin wrote:
> Hi Martin,
> 
> I heard form 2 other users (Jeff Scott and Gael, but both with
> similar options & params) a similar issue regarding unrealistic 
> surface temp.
> So, I think it's a more general problem that just our set-up.
> 
> Cheers,
> Jean-Michel
> 
> On Mon, Jan 30, 2012 at 05:04:48PM +0100, Martin Losch wrote:
> > Dear sea-ice modelers,
> > 
> > just out of curiosity I turned on the non-legacy seaice code (SEAICE_GROWTH_LEGACY undefine and SEAICE_SOLVE4TEMP_LEGACY undefined and set some other flags that go along with it, see below). To further my boldness, I also turned on:
> > #define MCPHEE_OCEAN_ICE_HEAT_FLUX
> > #define GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
> > 
> > The solutions that I get for an Arctic domain are comparable but different. The non-legacy code gives generally thicker ice in the interior, which I think is generally good, as the legacy code tends to produce ice that's on the "thin side" compared to other solutions.
> > 
> > However (appart from the fact that there was HEFF~=0 over land), I get very cold surface temperatures (down to -21degC) in some areas (Lena Delta), interesting this starts in June/July when ice should be melting. That's clearly not very physical and I am wondering if others have observed this behavior. Is there a solution to this? Before I try it myself, is it connected to the 
> > #define MCPHEE_OCEAN_ICE_HEAT_FLUX
> > #define GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
> > flags? (Likely, isn't it?) Or  SEAICE_OCN_MELT_ACT_ON_AREA?
> > 
> > Your experience with this is appreciated ...
> > 
> > Martin
> > 
> > PS. Here are the relevant flags:
> > C--   make conservation of freshwater complete
> > #undef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET
> > 
> > C--   Use the Old version of seaice_growth (close to cvs version 1.70)
> > C     otherwise, use the merged version (with some of Ian Fenty s code)
> > #undef SEAICE_GROWTH_LEGACY
> > 
> > C--   options only available in the merged version (from Ian Fenty s code)
> > #ifndef SEAICE_GROWTH_LEGACY
> > C-    to ensure heat conservation in the coupled ocean-seaice system
> > #define SEAICE_HEAT_CONSERV_FIX
> > C-    to switch on/off open-water freezing contribution to thickness tendency:
> > # define SEAICE_DO_OPEN_WATER_GROWTH
> > C-    ifdef SEAICE_DO_OPEN_WATER_GROWTH then define SEAICE_DO_OPEN_WATER_MELT
> > C     to also allow open-water air-sea heat fluxes melt ice
> > # undef SEAICE_DO_OPEN_WATER_MELT
> > C-    to switch on/off ocean heat contribution to seaice cover reduction:
> > # define SEAICE_OCN_MELT_ACT_ON_AREA
> > C-    to preclude infinitesimal ice concentrations:
> > # undef ALLOW_PRECLUDE_INFINITESIMAL_AREA
> > #endif
> > 
> > C-    to use the MCPhee formula in computing ocean/ice fluxes
> > #define MCPHEE_OCEAN_ICE_HEAT_FLUX
> > #define GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
> > 
> > C--   Use the Old version of seaice_solve4temp (formerly seaice_budget_ice)
> > C     otherwise, use Ian Fenty s version
> > #undef SEAICE_SOLVE4TEMP_LEGACY
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
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> > MITgcm-devel at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-devel
> 
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