[gradsusr] CMIP5 and GrADS

[James T. Potemra]

Jennifer:

I'm curious whether you will be distributing the processed model output 
via an OPeNDAP server?  Or maybe someone knows of one already?  Thanks,

Jim

On 1/4/13 2:00 PM, Jennifer Adams 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 <mailto:jma at cola.iges.org>
>
>
>
>
>
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