[gradsusr] CMIP5 and GrADS

[Faisal Al Zawad]

Dear Jennifer,
                  I am interested in your scripts. Thank you for having
such a vibrant generous and thoughtful spirit.
Happy New Year!

Faisal


On Sat, Jan 5, 2013 at 12:02 PM, Andrew Friedman <andfried at berkeley.edu>wrote:

> Dear Jennifer,
> I would be very interested in these scripts.
> Thanks much,
> Andrew
>
>
> On Jan 4, 2013, at 4:00 PM, Jennifer Adams <jma at cola.iges.org> wrote:
>
> Dear All,
> I will be giving a presentation at the AMS meeting next week on strategies
> I've used to download CMIP5 data. It's kind of a technical talk, maybe only
> of interest to a few members of this forum, but there is one slide that is
> relevant for GrADS (the text is below). I've done a bit of scripting to
> automatically generate descriptor files (for 'xdfopen' and 'open' when PDEF
> is necessary). The script parses the list of data files to determine the
> range of time steps for a particular variable and then generates the
> relevant CHSUB entries. It also does some other data-management checking to
> make sure the files cover a continuous, non-overlapping time span. Other
> functionality is listed below under the first bullet. I also have some code
> that will create PDEF files for non-rectilinear grids. ESMF's
> RegridWeightGen tool and a custom C program I wrote to translate the
> weights into a PDEF file make this a relatively easy job, allowing GrADS to
> handle a lot of data that were previously inaccessible. Although these
> scripts were all written for CMIP5 data, they can be adapted for other data
> sets. At some point, I'd like to bring some of this code under the hood of
> GrADS, but that is still a bit far off… In any case, please let me know if
> you are interested in any of my scripts -- it seems a shame to spend so
> much time developing code for only one person to use.
> --Jennifer
>
>
> •Create GrADS descriptor files
> Aggregate files over time dimension
> Make use of ensemble dimension when appropriate
> Identify missing or overlapping time periods
> Assign non-standard dimensions
>    (e.g. basin averages or fixed fields)
> Handle 365_day calendars
> • Create PDEF files for non-rectilinear grids
> For ocean and sea ice realms
> ESMF’s RegridWeightGen utility generates the
>    interpolation weights
> Vector fields must be rotated from grid-relative
>    to Earth-relative coordinates before interpolation
>
>
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
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-- 
Faisal M. Al Zawad
Manager
Climate Change Unit
Office of Vice President
Presidency of Meteorology and Environment

Tel. +96626536194
Fax +96626524214
Mob +966599550595
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