[MITgcm-devel] Re: Large & Yeager 2004

[Jean-Michel Campin]

Hi,

Just a comment:
On Tue, Dec 19, 2006 at 08:49:26AM +0100, Martin Losch wrote:
> Hi there,
> 
> just to diversify this discussion:
> 
> Yesterday I had a chat with our Arctic specialists (Gerdes, Koeberle,  
> Kauker, Karcher), and they use bulk formulae by Parkinson and  
> Washington (1970ies). Part of this is in pkg/seaice/ 
> seaice_budget_ocean/ice.F but only part of it. E.g. (they claim that)  
> they don't use downward long wave radiation as an input field because  
> the lw-fields are so bad in the Arctic, but instead estimate it from  
> the bulk formulae (and I had a look at their code, they actually do  
> that with some reference to SST). Apparently this is part of the  
> AOMIP (Arctic Ocean Model Intercomparision Project). I find this hard  
> to understand/believe, as I don't see how the ocean temperature has  
> an influence on the LW-radiation emitted by the atmosphere. But maybe  
> I am just narrow-minded? Andrea, you are my only hope of  
> clarification ...
> 
> Also they use dew point temperature and relative humidity instead of  
> specific humidity. It's all so strange ...
> 

I was thinking that the (downward) short-wave was also computed
(from a simple formulae + cloud cover) and not read from file. 
And the way I understand it was that those people don't
trust too much the reanalysed radiative fluxes over the Arctic,
and recompute them all from SST, air temperature and cloud cover.

Jean-Michel