[ncl-talk] regrid to EASE grid

[Peter Gibson]

Hi Dennis,


Thanks for providing these files.

Correct me if wrong - but it appears the EASE files provided only cover the Northern Hemisphere (min=0.00012   max=90)?


And, therefore setting res at gsnPolar     = "SH" produces missing values in the plots.

During the regridding several warnings also produced: warning:avg: Entire input array contains missing values, can't compute average


If this is the issue, and since I am interested in the SH, is it possible to upload EASE grids that include the SH?


Thanks,

Peter

________________________________
From: Dennis Shea <shea at ucar.edu>
Sent: Wednesday, September 7, 2016 9:03:50 AM
To: Peter Gibson
Cc: ncl-talk at ucar.edu
Subject: Re: [ncl-talk] regrid to EASE grid

The 'EASE.nc' and 'CCSM4.nc" files are not available. However, the source CCSM4 file contained data on a rectilinear grid. We have several EASE grid files which contain the latitude and longitudes for several EASE configurations. Hence, you want rectilinear to curvilinear regridding. Attached is a sample output (png) and the NCL script used. The script is similar to ESMF_regrid_9.ncl

I have placed the source ERAI file and several files containing various latitude and longitude grid configurations at the following ftp location:

ftp ftp.cgd.ucar.edu<http://ftp.cgd.ucar.edu>
anonymous
your_email
prompt
cd pub/shea/ESMF_EASE
ls
mget *
quit

   518856   sep  6 16:54 EaseLatLon_100km.nc
 33224032 sep  6 16:54 EaseLatLon.1441x1441.nc<http://EaseLatLon.1441x1441.nc>
   8317800 sep  6 16:54 EaseLatLon.721x721.nc<http://EaseLatLon.721x721.nc>

 43913096 sep 6  16:55 erai_1989-2009.mon.msl_psl.nc<http://erai_1989-2009.mon.msl_psl.nc>

The example uses the EASE (721,721) grid.

You may wish to test the bilinear and conservative methods.
Generating the weights for the conservative method may take some time.

Good Luck





On Mon, Sep 5, 2016 at 9:39 PM, Peter Gibson <peter.gibson at unsw.edu.au<mailto:peter.gibson at unsw.edu.au>> wrote:

Hi all,

I am attempting to regrid ERA-Interim to an EASE grid, using for example the script https://www.ncl.ucar.edu/Applications/Scripts/ESMF_regrid_9.ncl


The files "EASE.nc" and "CCSM4.nc" are not available on the example data page http://www.ncl.ucar.edu/Applications/Data/

can they please be added?


Regards,

Peter


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