Re: [ferret_users] Regird tripolar grid

[Russ Fiedler <russell.fiedler@xxxxxxxx>]

Hi,

The MOM distribution includes tools for the postprocessing of model data
on tripolar grids onto regular lat/lon grids. You need the underlying
grid_spec.nc file and need to create an exchange grid for your 2 degree
resolution grid so that the interpolations are done correctly.

See the file

src/postprocessing/regrid/regrid.F90

in your MOM distribution. See also

http://data1.gfdl.noaa.gov/~arl/pubrel/r/mom4p1/src/mom4p1/doc/mom4_manual.html#Postprocessing%20regrid%20tool



If you are using the newer MOSAIC style of grid file I think you want
the fregrid tool in

src/tools/fregrid

Russ




On Thu, 2013-03-07 at 09:27 +1100, Ansley Manke wrote:
> Hi,
> Ferret needs special handling for these grids. Grids like the tripolar 
> grid are called curvilinear grids in the Ferret documentation. So check 
> under "curvilinear" or "regridding, curvilienar" in the documentation 
> index for the CURV_TO_RECT and CURV_TO_RECT_MAP function.
> 
> These functions are correct but slow. We have some newer ones on the 
> horizon, using methods and code from the Earth System Modeling Framework.
> 
> Ansley
> 
> On 3/6/2013 1:34 PM, Boyin Huang - NOAA Federal wrote:
> > Hi Ferreters,
> > Can we regrid tripolar grid data from GFDL MOM model outputs (NetCDF 
> > format) to regular 2x2 grid using ferret?
> > I used the following script that failed in the Arctic region
> > use tos_day_GFDL-ESM2G_historical_r1i1p1_18610101-18651231.nc
> > SET MEMORY/SIZE=320
> > define axis/x=0e: 358e:2/unit=degree xlon
> > define axis/y=88S:88N: 2/unit=degree ylat
> > define grid/x=xlon/y=ylat mygrid
> > list/file="tos.dat"/format=stream/L=1:1825/clobber tos[g=mygrid]
> >
> > Any suggestions are welcomed.
> > Thanks
> >
> > -- 
> > Boyin Huang
> > Ingest and Analysis Branch
> > Global Climate Application Division
> > NCDC/NOAA, Room-514
> > Phone 828-271-4851
> > Fax 828-271-4022, 828-271-4246
>