NCO:ncap2 is the function to do it: _ncap2 -s ‘new_var=var1+var2’ in_filename.nc outfilename.nc The output file will have all of the variables that exist in the input file as well as the new_var. Add -O if your input and output files are the same (overwrite). I do not know what the -s stands for. BUT the new_var will have the same long_name as the first variable used for summing (i.e. it could make some things a bit confusing).

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The NCO (netCDF Operator) command ncks (netCDF Kitchen Sink). From the documentation: The nickname "kitchen sink" is a catch-all because `ncks` combines most features of `ncdump` and `nccopy` with extra features to extract, hyperslab, multi-slab, sub-set, and translate into one versatile utility. `ncks` extracts (a subset of the) data from input-file and and writes (or pastes) it in netCDF format to output-file, and optionally writes it in flat binary format to binary-file, and optionally prints it to screen.

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Riinu Ots

if it aint broke, you’re outdated

Data Manager

Edinburgh, UK