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Opening and editing an existing netCDF fileThe NCL function addfile can be used to read, create or overwrite a NetCDF file. To overwrite an existing file, use a "w" as the second argument. Note that you can not change the dimensionality of any existing variables, but you can change the values. If adding to a netCDF file the type and size of the variable must already exist.
begin in = addfile("./esvc.nc","w") (ncdump of original file) z_t = (/30,40,89,78,45,234,98,23,456,294,12,17,40,56,17,32,85,93,72,\ 20,46,24,90,89,25/) in->z_t=(/z_t/) (ncdump of modified file) end