[MITgcm-support] EXF and time-interpolation again

[Martin Losch]

Lars,
the time interpolation is linear for the exf package the "generic"  
external_fields_load.F routine. In principle you can make  
tutorial_global_oce_latlon or global_with_exf  produce exactly the  
same results. Patrick and I have once tried this with success  
(although it was not easy). Here's what I remember:
1. put the startdata to the middle of the month (15th should work),  
this is what is assumed in external_fields_load.F
2. set the exf parameter windstressmax (data.exf, the default is 2.0)  
to some very high value that is larger than any of of you windstress  
values because in exf_mapfields.F all windstress is capped by  
windstressmax.

That should do it.

Martin
On 13 Nov 2007, at 15:54, Lars Czeschel wrote:

> Hi MITgcm users,
>
> is there any difference in the  time-interpolation of the forcing
> with or without the EXF package.
>
> I usually using climatological monthly mean forcing as in the
> tutorial_global_oce_latlon or global_with_exf example.
>
> I noticed that the monthly mean ustress/vstress output from
> tutorial_global_oce_latlon and global_with_exf
> is different (they both use the same windstress forcing).
>
> The forcing output fits better after changing the startdate in
> data.exf to the middle of the month, e.g.:
> ustressstartdate1=19910116,
> repeatPeriod = 31104000,
> although it is not identical to tutorial_global_oce_latlon.
> (with/without spatially interpolation in data.exf).
>
> Thanks for any comments,
> Lars
>
> --------------------------------------
> Lars Czeschel
> University of Oxford
> Atmospheric, Oceanic and Planetary Physics
> Clarendon Laboratory
> Parks Road
> OX1 3PU Oxford
>
>
>
>
>
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