[MITgcm-support] from C- to A-grid (particle tracking)

[Blundell J.R.]

Hi Andrea,
          This isn't a simple answer to your question, but you might
like to have a look at ARIANE:
http://stockage.univ-brest.fr/~grima/Ariane/
(original webpage)
which is heavily used here at NOC, Southampton. It has native support
for some curvilinear C-grid models, such as OPA-NEMO and ROMS,
though not (as far as I can see) MITgcm. Given that it has support for
several models, I would imagine that the logic of adding another might
not be too bad, perhaps easier that interpolating onto a regular A-grid.
We use v2.2.8_05 .
See also 
http://salishsea-meopar-docs.readthedocs.org/en/latest/particles/
which seems to have some of the most up-to-date documentation.
I should explain that I build the software (that part works quite well)
for others to use; I'm not a user myself.
http://earthscience.stackexchange.com/questions/761/what-are-some-
options-for-online-and-offline-particle-tracking-in-ocean-models
seems to suggest that CMS can handle "various Arakawa-staggered grids",
as presumably it must if it handles HYCOM and ROMS output.

                            Jeff Blundell
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________________________________________
From: Andrea Cimatoribus [andrea.cimatoribus at epfl.ch]
Sent: 22 February 2017 13:49
To: mitgcm-support at mitgcm.org
Subject: [MITgcm-support] from C- to A-grid (particle tracking)

Dear all,
I am in the process of setting up some particle tracking experiments.
After some research and some thinking about my needs, I am inclined to
use an offline tool rather than the MITgcm flt package, most likely CMS
(https://www.rsmas.miami.edu/users/cparis/oss.html).

In order to use CMS, I need to interpolate the MITgcm results from my
native curvilinear C-grid to the non curvilinear, non rotated A-grid
which CMS requires. My questions then are:
- is there a way to do this interpolation maintaining the flow (at least
approximately) non divergent? (with complex boundaries)
- does anyone have any suggestion on working with MITgcm+CMS, or more in
general with MITgcm+particle tracking?

The alternative is to implement C-grids in CMS, which would be
interesting but I'm not yet sure it's realistic.

Thanks, Andrea


--
Andrea Cimatoribus
postdoctoral researcher
EPFL ENAC IIE ECOL
https://people.epfl.ch/andrea.cimatoribus



PS: To answer the obvious question one may have: I think that the flt
package is not the right tool for me, since I would like to have several
particles (>>1000), doing repeated experiments over the same period of
time, in a rather small domain. I think that an offline tool is in this
case not only much faster, but also much more flexible.

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