Re: ncl talk

MO,

You should check out our ESMF regridding examples at:

http://www.ncl.ucar.edu/Applications/ESMF.shtml

There is more than one interpolation option available, which is discussed in the "more detailed description of ESMF regridding" section near the top of the page.

Since you are going from a 1deg grid to a 1.95x2.5deg grid, you'll want to set the "DstGridType" option to "1.95x25".

The best examples to look at are ESMF_regrid1.ncl, ESMF_regrid_2.ncl, and ESMF_regrid_4.ncl. These examples also have scripts that show you how to regrid the variable once you have a weights file, since you don't need to keep regenerating it for the same type of source and destination grid. See the corresponding ESMF_wgts_n.ncl file.

--Mary

On Jun 1, 2014, at 6:14 PM, "Omary, Mohammad" <omary@email.unc.edu> wrote:

> Rubin,
> The cdo regridding functions do not preserve the mass in case of regridding emissions netCDF file.
>
> When I regrid 1x1 degree to
> • 1.9x2.5 ----> ratio old/new 4.8
> • 2x2 ----> ratio old/new 4
> • 1x1 -----> ratio old/new 1
> • 0.5x0.5 -----> ratio old/new 0.25
> Do you have any idea how preserve the mass or if there any other program/function to do that?
>
> Thanks,
> MO
> -------------------
> Mohammad Omary
> Institute for the Environment
> University of North Carolina
> http://www.ie.unc.edu/cempd
> voice:951-789-6284
> omary@unc.edu
>
>
> From: Ruben van Hooidonk <rubski@gmail.com>
> Date: Friday, May 23, 2014 8:29 AM
> To: Mohammad Omary <omary@email.unc.edu>, "ncl-talk@ucar.edu" <ncl-talk@ucar.edu>
> Subject: ncl talk
>
>> Hi,
>>
>> In regards to this question:
>>
>> I am new into global emissions (expert in SMOKE and CAMQ emissions) and have mozart emissions in 1x1 degree grid. Is there a utility out there to regrid the netCDF from 1x1 degree to lower resolution (1.95x2.5 degree)?
>>
>> For regridding I use the Climate Data Operators (CDO https://code.zmaw.de/projects/cdo)
>>
>> It is easy and super fast!
>>
>> On the command line I would do:
>>
>> cdo remapbil,r92x144 file_in.nc file_out.nc
>>
>> Hope this helps!
>>
>> Ruben
>>
>> Date: Thu, 22 May 2014 17:19:02 +0000
>> From: "Omary, Mohammad" <omary@email.unc.edu>
>> Subject: regridding 1x1 degree to 1.9x2.5
>> To: "ncl-talk@ucar.edu" <ncl-talk@ucar.edu>
>> Message-ID: <CFA37F6D.155AD%omary@email.unc.edu>
>> Content-Type: text/plain; charset="us-ascii"
>>
>>
>> I am new into global emissions (expert in SMOKE and CAMQ emissions) and have mozart emissions in 1x1 degree grid. Is there a utility out there to regrid the netCDF from 1x1 degree to lower resolution (1.95x2.5 degree)?
>>
>> Thanks,
>> MO
>> -------------------
>> Mohammad Omary
>> Institute for the Environment
>> University of North Carolina
>> http://www.ie.unc.edu/cempd
>> voice:951-789-6284
>> omary@unc.edu<mailto:omary@unc.edu>
>>
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Received on Tue Jun 3 08:11:39 2014