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ml2pl - No 3D variable with hybrid sigma pressure coordinate found

Added by Sylvia Sullivan over 3 years ago

I need to vertically remap a file from hybrid sigma pressure levels to pressure levels. When I run cdo ml2pl on my file, I get a message

Warning: No 3D variable with hybrid sigma pressure coordinate found!

This question was asked elsewhere, and Uwe said to use ncatted and add lev as a bounds attribute (ncatted -a bounds,lev,c,c,"ilev" <file>). I ran this command and when I run cdo ml2pl thereafter, I get a message

Warning (cdfScanVarAttr): NetCDF: Variable not found - ilev
Warning: No 3D variable with hybrid sigma pressure coordinate found!

I extracted the first timestep of the file and attached it here (temp3.nc). How can I remap its variables (particularly ICNC_acc_ave) from hybrid sigma pressure to pressure levels? Many thanks.


Replies (4)

RE: ml2pl - No 3D variable with hybrid sigma pressure coordinate found - Added by Sylvia Sullivan over 3 years ago

I don't think the file attached correctly the first time.

temp3.nc (1.98 MB) temp3.nc

RE: ml2pl - No 3D variable with hybrid sigma pressure coordinate found - Added by Ralf Mueller over 3 years ago

Hi Silvia!

I cannot find the related coefficients hyam and hybm in the file not the any surface pressure aps. And I think you called 

ncatted -a bounds,lev,c,c,lev temp.nc
rather than 
ncatted -a bounds,lev,c,c,"ilev"

IMO some essential parts of the hybrid sigma pressure are still missing.

cheers
ralf

RE: ml2pl - No 3D variable with hybrid sigma pressure coordinate found - Added by Sylvia Sullivan over 3 years ago

Many thanks for taking a look, Ralf. As you also see in the temp3.nc metadata, I run a merge command (before the ncatted one) to combine a file with the ICNC_acc_ave variable and a second with pressures and the hybrid sigma pressure level values (hyam and hybm). When I run cdo -merge, hyam and hybm disappear. How do I keep them in the output file with the merge command?

RE: ml2pl - No 3D variable with hybrid sigma pressure coordinate found - Added by Ralf Mueller over 3 years ago

can you upload all the files you wanted to merge? or at least their first time stamps

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