[MITgcm-support] separating sea ice and atmos FW fluxes

[Martin Losch]

Hi Paul,

I think these are the relevant diagnostics for DV/DT (without the advection which, presumably, you don’t want):
      diagName  = 'SIdHbOCN'
      diagTitle = 'HEFF rate of change by ocean ice flux'

      diagName  = 'SIdSbATC'
      diagTitle = 'HSNOW rate of change by atm flux over sea ice'

      diagName  = 'SIdSbOCN'
      diagTitle = 'HSNOW rate of change by ocean ice flux'

      diagName  = 'SIdHbATC'
      diagTitle = 'HEFF rate of change by atm flux over sea ice'

      diagName  = 'SIdHbATO'
      diagTitle = 'HEFF rate of change by open ocn atm flux’
all in meters of sea ice per second. Could it be easier than that? (;

Martin


> On 17 Feb 2015, at 04:15, Holland, Paul R. <pahol at bas.ac.uk> wrote:
> 
> Dear listees
> 
> I'm sorry but I'm getting confused with sea ice freshwater diagnostics... again!  I want to work out how much of the freshwater going into the ocean comes from sea ice, P-E, runoff, and ice shelves.  It's the first two I have problems with.
> 
> From previous threads I know that SIempmr is the total FW flux into the ocean, and SIatmFW is the total FW leaving the atmosphere.  However, I want the net FW flux into the ocean from ice melt, and the net P-E into the ocean through leads in the ice.  I can't work out how to derive that from these two diagnostics.
> 
> The way I see it, there are three relevant fluxes:
> 
> AI: atmophere->ice FW flux
> AO: atmosphere->ocean FW flux
> IO: ice->ocean FW flux
> 
> SIempmr=IO+AO, while SIatmFW=AI+AO.  I want IO and AO, so I am trying to solve a system of 2 equations with 3 unknowns!  Can someone tell me where I am going wrong, or provide me with one or more diagnostics that will unlock the system?  If I had the change in total ice mass DV/Dt=AI-IO that would do it, but I don't fancy trying to calculate the material derivative.
> 
> Hopefully I'm just confused.
> 
> cheers,
> 
> Paul
> 
> Dr. Paul Holland
> British Antarctic Survey
> p.holland at bas.ac.uk
> +44 (0) 1223 221444
> http://www.antarctica.ac.uk/profile/paul
> 
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