[MITgcm-support] Grid Generation

[Martin Losch]

Hi Zhan Lian,

in theory, it is possible to use any (quasi-) orthogonal curvilinear grid. You’ll need to find a mesh generator that can construct the grid for you. For the simple grid layout (i,j), that the MITgcm can handle, you could even write this yourself by defining a smooth transistion of grid spacing from the high resolution to the low resolution area. Then you need to provide the various grid parameters as binary files (lat,lot, dlat, dlon, etc. see code that is activated with defining OLD_GRID_IO in ini_curvilinear_grid.F for more details).

For your problem, however, this <https://fesom.de> may also be interesting.

Martin

> On 19. Jul 2020, at 10:18, lianzhan at fio.org.cn wrote:
> 
> Dear community,
> 
> I'm facing a problem of geographically variable grid generation. I'm trying to study the long-term variation of mesoscale eddies in the Southern Indian Ocean. The horizontal resolution should be high (~1/20 degree) in this area. However, since the Southern Indian Ocean is easy to be effected by the Indonesia Through Flow and ACC. I would like to make a quasi-global model.  To save the consumption of simulation, except for the Southern Indian Ocean, the resolution can be coarse (~1 degree).
> 
> Does anyone have the experiences on how to make grids with geographically variable resolution? I have noticed that in the latest manual, there is a brief introducion about a grid generation suite named "SPGrid". Somehow, I didnot find how to get this software and I am not sure if it can meet my requirment. Any suggestions would be appreciated.
> 
> Best
> 
> Zhan Lian
> 
> lianzhan at fio.org.cn
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