[MITgcm-support] interpolation

[Martin Losch]

Hi Jane,
Ed's suggestion of switching to netcdf output is a very good one. But 
just in case you want to stick with the old output (because you don't 
want to or can not regenerate your pickup), have a look at the routine 
where the pickup is written. You'll find the code in 
model/src/checkpoint.F, in the part after
#else /* OLD_STYLE_WITH_MANY_FILES */
There you'll see that your ?,??,??? are the tendency terms for u,v,T,S 
and X, XX are probably the tendencies for the non-linear free surface 
(depends on what you use). Everything is 3D excep for Eta-related 
terms.

Again, I think in the long run, it is better to follow Ed's suggestion 
with the NetCDF, much easier to understand what's in the files.

Martin

On Nov 23, 2004, at 7:23 PM, Ed Hill wrote:

> On Tue, 2004-11-23 at 17:44 -0500, Jane Jimeian wrote:
>> we want to interpolate from a coarse grid to a finer grid and restart 
>> from
>> a  pickup file.  does anybody have a matlab script or a subroutine 
>> that does
>> this.  if not, can someone explain the structure of the pickup file?  
>> we
>> think it is U,?,V,??,T,W,S,???,Eta,X,XX where ?, ??, ??? are 3-D 
>> fields that
>> we don't recognize and X, XX are 2-D field that apparently don't 
>> matter to
>> us.  help will be appreciated.
>
>
> Hi Jane,
>
> If you switch to NetCDF for your output, then the structure of the
> pickup files is *very* easy to understand.  And the reading of NetCDF
> pickup files is working--people here are using it.
>
> To get started using the MNC/NetCDF interface, please see the examples
> in MITgcm/verification.  All you need to do is:
>
>  1) add "mnc" to your current "packages.conf" file
>  2) copy over one of the "data.mnc" files from the
>       examples in MITgcm/verification
>  3) modify the "data.mnc" file to suit your needs
>
> and thats it!
>
> Ed
>
> -- 
> Edward H. Hill III, PhD
> office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
>              Cambridge, MA 02139-4307
> emails:  eh3 at mit.edu                ed at eh3.com
> URLs:    http://web.mit.edu/eh3/    http://eh3.com/
> phone:   617-253-0098
> fax:     617-253-4464
>
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