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Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure

Added by Mengmiao Yang about 8 years ago

I want to use the "ml2pl" to interpolate the variable mass flux in CCSM4 model output, which is in hybrid sigma pressure coordinates (27 levels), but it always come out the warning "No data on hybrid model level found!"
So, I want to use the setzaxis to create a z axis meet the requirment. However, there is only "a" and "b" in the data I downloaded from the CMIP5 dataset, I am still lacking the data to create the "vct" in z-axis description.

Is there any solution to interpolate value from the hybrid sigma pressure coordinates into pressure coordinates?

P.S. cause the data is too large to upload, I can not upload it, but if you need the data, it can be reached in http://cera-www.dkrz.de/WDCC/ui/containerArchive?acronym=NRS4scMAAmc111v120531


Replies (8)

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Ralf Mueller about 8 years ago

I manually changed some variables and finally got it running. Please check, if the upload is ok for you.

mc_01_rename.nc (5.92 MB) mc_01_rename.nc

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Mengmiao Yang about 8 years ago

Thank you so much! But I just tried the command"cdo ml2pl,1000,2000,3000,5000,7000,10000,15000,20000,25000,30000,40000,50000,60000,70000,85000,92500,100000 ./mc_01_rename.nc ./mc_17_cdo.nc", it still comes out a warning saying "No data on hybrid model level found". Could you attach the command line which can run it successfully?

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Ralf Mueller about 8 years ago

I ran 

cdo ml2pl,1000,2000,10000,20000 mc_01_rename.nc mc_01_rename_pl.nc

mc_01_rename_pl.nc (1.07 MB) mc_01_rename_pl.nc

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Ralf Mueller about 8 years ago

Hi again!

I checked the current implementation together with the main developer (uwe) and it came out, that CDO cannot process your vertical hybrid levels because it does not apply the given formula correctly. Although it seemed to run successfully, the data is wrong.

sorry for the bad news ;-(

cheers
ralf

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Mengmiao Yang about 8 years ago

Hi, Ralf,

Thank you so much for your kindly help anyway. I will try to find other method to figure it out.

Mengmiao

RE: Have trouble to interpolate hybrid sigma pressure coordinates in CCSM4 to pressure - Added by Leilane Passos over 7 years ago

Hi Mengmiao,

Were you able to interpolate the sigma coordinate CCSM4 data to pressure levels with another program?

Leilane

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