CDO

Hi,

I have the two files
zg200_AFR-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4_v1_day_20010101-20051231.nc
zg500_AFR-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4_v1_day_20010101-20051231.nc
from a CORDEX server (e.g., http://esg-dn1.nsc.liu.se/thredds/fileServer/esg_dataroot1/cordexdata/cordex/output/AFR-44/SMHI/ECMWF-ERAINT/evaluation/r1i1p1/SMHI-RCA4/v1/day/zg200/v20130927/zg200_AFR-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4_v1_day_20010101-20051231.nc)

The ncdump header provides me with the following info. So there is some info on the pressure level there. However, it's not in the dimensions.

dimensions:
rlon = 194 ;
rlat = 201 ;
time = UNLIMITED ; // (1826 currently)
bnds = 2 ;
variables:
...
double plev ;
plev:standard_name = "air_pressure" ;
plev:long_name = "pressure" ;
plev:units = "Pa" ;
plev:positive = "down" ;
plev:axis = "Z" ;

float zg200(time, rlat, rlon) ;
zg200:grid_mapping = "rotated_pole" ;
zg200:_FillValue = 1.e+20f ;
zg200:standard_name = "geopotential_height" ;
zg200:long_name = "Geopotential Height" ;
zg200:units = "m" ;
zg200:coordinates = "lon lat plev" ;
zg200:missing_value = 1.e+20f ;
zg200:cell_methods = "time: mean" ;

Does anybody know an easy way to merge the two files together such that there are two pressure levels in the output file?

Or to start with: how can I obtain the plev value with cdo? Everything I tried so far (selname, selvar, etc.) did not work.
Any help & suggestions are highly welcome!