CDO

All,

I'm trying to process a CNRM-CM5 dataset from CMIP5 with CDO and I get
"Unsupported array structure" and "Unsupported array structure" errors.

I use CDO version 1.5.3

>>>cdo -V
Climate Data Operators version 1.5.3 (http://code.zmaw.de/projects/cdo)
Compiler: gcc -std=gnu99 -g -O2 -pthread
 version: gcc (SUSE Linux) 4.3.4 [gcc-4_3-branch revision 152973]
    with: PTHREADS Z
Compiled: by root on giotto (x86_64-unknown-linux-gnu) Dec  2 2011 09:07:49
     CDI library version : 1.5.3 of Dec  2 2011 09:07:41
 CGRIBEX library version : 1.5.1 of Aug 29 2011 20:30:27
GRIB_API library version : 1.9.9
  netCDF library version : "4.0.1" $
 SERVICE library version : 1.3.0 of Dec  2 2011 09:07:22
   EXTRA library version : 1.3.0 of Dec  2 2011 09:07:16
     IEG library version : 1.3.0 of Dec  2 2011 09:07:20
    FILE library version : 1.7.1 of Dec  2 2011 09:07:17

A sample sea surface temperature (tos) file is attached.
This is what I get when I try to splityear

>>>cdo splityear tos_Omon_CNRM-CM5_rcp45_r1i1p1_209601-210012.nc tos
Warning (scanVarAttributes) : NetCDF: Variable not found - areacello
Warning (define_all_grids) : Unsupported array structure, skipped variable tos!

cdo splityear: Open failed on >tos_Omon_CNRM-CM5_rcp45_r1i1p1_209601-210012.nc<
Unsupported file structure

I have noticed there is a similar problem with areacello posted by Tao Zhang
(https://code.zmaw.de/boards/1/topics/741) about 1 month ago.
I have tried with the cdo operators info,infon,sinfo,sinfon on and I get the same type of
error.

>>> cdo info tos_Omon_CNRM-CM5_rcp45_r1i1p1_209601-210012.nc
Warning (scanVarAttributes) : NetCDF: Variable not found - areacello
Warning (define_all_grids) : Unsupported array structure, skipped variable tos!

cdo info: Open failed on >tos_Omon_CNRM-CM5_rcp45_r1i1p1_209601-210012.nc<
Unsupported file structure

As a side comment, the issue with areacello may be related to the fact that according
to CMIP5 standards an "associated_file" attribute can be adopted, linking to a descriptor
of the grid: areacello is the ocean grid-cell area
(http://cmip-pcmdi.llnl.gov/cmip5/docs/CMIP5_output_metadata_requirements.pdf).

The areacello_fx_CNRM-CM5_decadal1960_r0i0p0.nc for CNRM is also attached in case it helps.

Using the cdo operator info on areacello gives the same "Unsupported array/file structure" error.

>>>  cdo info areacello_fx_CNRM-CM5_decadal1960_r0i0p0.nc
Warning (define_all_grids) : Unsupported array structure, skipped variable areacello!

cdo info: Open failed on >areacello_fx_CNRM-CM5_decadal1960_r0i0p0.nc<
Unsupported file structure

Is there any workaround or am I missing something?
Thanks a lot for helping with this, it would solve a lot of problems :-)

Cheers

Sandro