[MITgcm-support] Choosing coordinate system for Adriatic sea

[Martin Losch]

Hi Andrea,

you should base your decision between cartesian and spherical grids  
on whether you think that the curvature of the earth matters for your  
problem. The ratio of 800km/6371km = 0.1256 may be small but I would  
probably use spherical coordinates.
 From a technical point of view, as Ed pointed out, there are no  
special difficulties of the spherical grid compared to the cartesian  
grid.

Martin
On Apr 10, 2006, at 4:10 PM, Andrea Cimatoribus wrote:

> Hi, I am writing again after some time, as I am working again at the
> OGS (trieste-Italy) to set up a model for the Adriatic Sea.
> I would like to have a tip about what coordinate system I should use.
> Adriatic sea is approximately a rectangle 800x300km pointing NW-SE
> (about 45° from the north), so we wanted to rotate axis to save
> computing time.
> The questions are:
> - should we use cartesian or spherical coordinates (we have always
> used Cartesian coordinates, but on a smaller domain)?
> - is there any difference in the output using one or the other?
> - is there any problem in modifing ini_cori.F to rotate axis?
>
> Thanks!
> Andrea Cimatoribus
>
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