NCO (NetCDF Operator)
This process is required to install NCO.
For, split variable “sst” from data.nc and make output “sst.nc”
-> ncks -v sst data.nc sst.nc
If you have more than two data files, sst.nc and mld.nc, and want to put them in new.nc,
-> ncks -A sst.nc new.nc
-> ncks -A mld.nc new.nc
then, new.nc has two variables in one data.