[MITgcm-support] changing size of sphere in grid tiles

[Jean-Michel Campin]

Hi Dave,

You are right about the sphere radius and curvilinear coordinate,
rSphere is not used to scale the grid dx,dy and area.
We talked about adding this feature to the code but it's not
yet done. 

In the mean time, you could modify the grid-files by scaling all the
dx,dy by the same factor = rSphere/6.37e+06
and scale the 4 grid-cel area by factor*factor
This is probaly simpler than to regenerate a new set of grid-files.

Cheers,
Jean-Michel

On Tue, Jan 18, 2011 at 01:04:45PM -0500, Dave Spiegel wrote:
> Dear Support,
> 
> I have been using the 32x32 grid tiles that come in the
> verification/aim.5l_cs/input/ directory.  I think that these files contain
> information about the size of the sphere that overrides the line in
> set_defaults.F that sets rSphere.
> 
> First, am I right in this inference?  (Looking at the output convinced me
> that the sphere had the radius of the Earth, even though I had re-set
> rSphere to another value in set_defaults.F.)
> 
> Second, I would like to generate new grid tiles that are appropriate to
> spheres with different radii.  I assume that the link below would be useful
> in this endeavor:
> [MITgcm] Index of
> /MITgcm_contrib/high_res_cube/matlab-grid-generator<http://mitgcm.org/viewvc/MITgcm/MITgcm_contrib/high_res_cube/matlab-grid-generator/>
> 
> But what should I actually do to generate these new files?  Further, is
> there a way to download the entirety of the directory at the above link as a
> tarball, instead of having to click on each file separately?
> 
> Many thanks,
> Dave
> 
> -- 
> Dave Spiegel, Ph.D.
> Department of Astrophysical Sciences
> Princeton University
> Peyton Hall
> Tel: (609) 258-0566
> Fax: (609) 258-8226

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