Ian,
I too have downloaded the IPCC DDC Grib files off of the web site that you cite,
and have had that same problems reading in the CCSR-NIES data. This happened to
me a couple of months ago, and I showed Dennis Shea the problem, who sent it
onto the NCL developers. Turns out that there is an error in the CCSR-NIES .grb
files that is causing NCL to fail. I believe that the number of latitudes north
of the equator is specified incorrectly in the files, and thus it is not a NCL
issue.
I contacted the DKRZ data support people telling them about the problem, and
they responded by saying the CCSR-NIES files read in fine using their software,
so they see no need to change them. (I'm paraphrasing here.)
Since that time I have started to analyze other data, and due to the same
problem specified above, the latitude coordinate variables are deciphered wrong
in NCL for the following data: CCCma, CSIRO, GFDL, NCAR-CSM, NCAR-PCM. (Although
NCL will not crash like it does for the CCSR-NIES data)
So, I believe the NCL developers are working on the problem, even though it is
not their fault these files were written incorrectly. In the meantime, I would
suggest using wgrib to write out a binary file and then read the binary file
into NCL.
On a much more minor note, NCL does not have the parameter table that the IPCC
DDC site used, so for instance TS (Sea surface temperature) is listed as Dew
point depression as the long_name in NCL.
(Did I leave anything out Dennis?)
Hope this helps.
Adam
>Hi,
>
>I have a set of grib files to open. They're climate model data,
>downloaded from the IPCC DDC here:
>
>http://ipcc-ddc.cru.uea.ac.uk/dkrz/dkrz_index.html
>
>The files come in at between 1.5 and 6MB, so hardly huge.
>
>The problem is that one set of files - from the CCSR/NIES model (last
>one in the table), give an error when I try loading them:
>
>ncl 0> a = addfile("CCSRNIES_SRES_A2_PREC_1990-2019.grb", "r")
>fatal:NclMalloc Failed:[errno=12]:Not enough space
>Segmentation fault (core dumped)
>
>Is this a known/recognised sequence of events? Grib files from all
>other models load without problem. The problem is with four separate
>files so I don't think it's a download/corruption issue; wgrib also
>reads them without trouble.
>
>ncl version 4.2.0.a027, Tru64 Unix on an Alpha.
>
>(it also fails with 4.2.0.a028 on OS X, but no error message, just an
>infinite wait :-/ )
>
>Cheers for any thoughts,
>
>Harry
>Ian "Harry" Harris
>Climatic Research Unit
>University of East Anglia
>Norwich NR2 4HG
>United Kingdom
>
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>ncl-talk AT ucar.edu
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-------------------------------------------------------------
Adam Phillips email: asphilli AT ucar.edu
Climate and Global Dynamics Division tel: (303) 497-1726
National Center for Atmospheric Research fax: (303) 497-1333
P.O. Box 3000
Boulder, CO 80307-3000 http://www.cgd.ucar.edu/~asphilli
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