[ncl-talk] Fwd: Problem with regrid from GFS to WRF regional grid using rgrid2rcm

[Dennis Shea]

Hi Andrew

[0]
Overall comment: the rgrid2rcm uses a simple, brute force algorithm.
If the interpolation is a bit slow then the ESMF regridding may be a
better lon term solution. Once thye weight files are generated and
saved to a netCDF file, they can be used to quickly perform
interpolations.

[1]
Most operational style models (NCEP, ECMWF, JRA) are ordered N->S. The
 rgrid2rcm requires that the input grid be ordered S->N. If the model
grid is N->S, try

   slp1     = a->PRMSL_3_MSL
   printVarSummary(slp1)                     ; look at 'lat' coord variable
   slp1     = slp1(::-1,:)                           ; reorder
   printVarSummary(slp1)                     ; look at 'lat' coord variable

   all the rest should be the same

[2]
ftp the GRIB file and the target WRF file, we could likely generate an
ESMF example.

ftp ftp.cgd.ucar.edu
anonymous
email
cd incoming
put ...
put ...
quit

Since we can not look at /ftp/incoming for security reasons, send us
the exact names of the files after a successful transfer

D




On Thu, Aug 27, 2015 at 11:22 AM, Andrew Kren - NOAA Affiliate
<andrew.kren at noaa.gov> wrote:
>
> ---------- Forwarded message ----------
> From: Andrew Kren - NOAA Affiliate <andrew.kren at noaa.gov>
> Date: Thu, Aug 27, 2015 at 8:57 AM
> Subject: Problem with regrid from GFS to WRF regional grid using rgrid2rcm
> To: ncl-talk at ucar.edu
>
>
> Dear NCL talk,
>
> I am running into an issue with regridding from the GFS global grid, which
> are grib files, to the regional WRF grid that I specify for my WRF runs.
> When I do a test script to see what the regridded dataset looks like, it
> does not match up with the GFS fields. Right now I am just looking at MSLP.
> I am using the ncl function rgrid2rcm. Is this not the correct regrid tool
> for my applications? I am not sure what I am doing wrong, if anything. There
> are no error messages when I run the script. I have uploaded a grib file and
> the wrfout file to the ftp site. The postscript files of the WRF output
> (correct grid) and my interpolated grid from GFS to WRF is attached, along
> with a script I am using. Any help would be most appreciated.
>
> Thanks,
> --
> Andrew Kren, PhD
> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> NOAA ESRL Global Systems Division (Rm 3C515)
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
>
>
> --
> Andrew Kren, PhD
> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> NOAA ESRL Global Systems Division (Rm 3C515)
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
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