[gradsusr] Problem reading Netcdf file from the GFDL model output

[Jennifer Adams]

Do not use 'sdfopen' with version 1.9 to look at files with a 365-day  
calendar -- the time axis info will likely be incorrect. You must use  
'open' or 'xdfopen' and provide the full TDEF information. This has  
been discussed at length in the forum, see for example:

http://gradsusr.org/pipermail/gradsusr/2009-January/008103.html
http://gradsusr.org/pipermail/gradsusr/2009-April/008489.html
http://gradsusr.org/pipermail/gradsusr/2009-December/010064.html

Jennifer


On Sep 30, 2010, at 10:02 AM, Roger Rodrigues Torres wrote:

> Dear Arlindo,
> I'm working with all the CMIP3 GCM output and I faced the same  
> problem with many others models.
> I found 2 manners to cope with it:
> 1) It is possible to open with a old version of Grads (grads-1.9b4).
> 2) to trasform these data to Grb by CDO.
> Thanks,
> Roger
>
> 2010/9/30 Arlindo Meque <mequitomz at yahoo.com.br>
> Dear GrADS users,
>
>
> 1. I have downloaded a GFDL model output from the PCMDI
> (http://www-pcmdi.llnl.gov/).
>
>
>
> 2. I tried to open the file in GrADS and got the following error  
> message:
> ga-> sdfopen
> pcmdi.ipcc4.gfdl_cm2_1.sresa2.run1.monthly.pr_A1.200101-210012.nc
> Scanning self-describing file:
> pcmdi.ipcc4.gfdl_cm2_1.sresa2.run1.monthly.pr_A1.200101-210012.nc
> SDF Error: 365 day calendars are no longer supported by
> sdfopen.
> To open this file with GrADS, use a descriptor file with
> a complete TDEF entry and OPTIONS 365_day_calendar.
> Documentation is at
> http://iges.org/grads/gadoc/SDFdescriptorfile.html
> ga->
>
>
> 3.       I’m now trying to write the descriptor file  but  not sure  
> about the
> XDEF, YDEF, ZDEF, TDEF an EDEF options
>
> 4.       This is the output from the “ncdump -h” commmand:
>
> dimensions:
> lon = 144 ;
> lat = 90 ;
> time = UNLIMITED ; // (1200 currently)
> bnds = 2 ;
> variables:
> double lon(lon) ;
> lon:standard_name = "longitude" ;
> lon:long_name = "longitude" ;
> lon:units = "degrees_east" ;
> lon:axis = "X" ;
> lon:bounds = "lon_bnds" ;
> double lon_bnds(lon, bnds) ;
> double lat(lat) ;
> lat:standard_name = "latitude" ;
> lat:long_name = "latitude" ;
> lat:units = "degrees_north" ;
> lat:axis = "Y" ;
> lat:bounds = "lat_bnds" ;
> double lat_bnds(lat, bnds) ;
> double time(time) ;
> time:standard_name = "time" ;
> time:long_name = "time" ;
> time:units = "days since 2001-01-01
> 00:00:00smelt\',\'u_ref\',\'v_ref\',\'swdn_toa\'," ;
> time:axis = "T" ;
> time:calendar = "noleap" ;
> time:bounds = "time_bnds" ;
> double time_bnds(time, bnds) ;
> float pr(time, lat, lon) ;
> pr:standard_name = "precipitation_flux" ;
> pr:long_name = "Precipitation" ;
> pr:units = "kg m-2 s-1" ;
> pr:cell_methods = "time: mean" ;
> pr:original_name = "precip" ;
> pr:comment = "includes all types (rain, snow, large-scale,
> convective, etc.)" ;
>
> // global attributes:
> :title = "GFDL CM2.1, SRESA2 (run1) SRES A2 experiment
> output for IPCC AR4 and US CCSP" ;
> :institution = "NOAA GFDL (US Dept of Commerce / NOAA /
> Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA)"
> ;
> :source = "GFDL_CM2.1 (2004): atmosphere: AM2.1 (am2p13fv,
> M45L24); ocean: OM3.1 (mom4p1p7_om3p5, tripolar360x200L50);
> sea ice: SIS; land: LM2; infrastructure: FMS preK release" ;
> :contact = "GFDL.Climate.Model.Info at noaa.gov" ;
> :project_id = "IPCC Fourth Assessment and US CCSP
> Projects" ;
> :table_id = "Table A1 (20 September 2004)" ;
> :experiment_id = "SRES A2 experiment" ;
> :realization = 1 ;
> :cmor_version = 0.96f ;
> :Conventions = "CF-1.0" ;
> :history = "input/atmos.200101-210012.precip.nc At
> 10:21:27 on 01/28/2005, CMOR rewrote data to comply with CF
> standards and IPCC Fourth Assessment and US CCSP Projects
> requirements" ;
>
>
>
>        1. help is need
>
>
> Arlindo
>
>
>
>
> _______________________________________________
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>
>
>
> -- 
> Roger Rodrigues Torres
> Ph.D. Student
> National Institute for Space Research (INPE)
> Center for Weather Forecast and Climate Studies (CPTEC)
> Phone: 55 12 3186-9541
> Personal Webpage: http://rtorres.webnode.com.br
> _______________________________________________
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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