Interpolation of real data initial conditions using ERA5

[ajrosales]

I have next question; I am using the ERA5 dataset to run the MPAS model but as ERA5 has two separated dataset from surface and different levels pressure when I use ungrib.exe to create the intermediate files, I generated them with two prefix (e.g. FNL and SFNL), so if I include two files with different prefix, how can I edit the namelist.init_atmosphere in the &data_sources “config_met_prefix =” to include these two prefix and just one of them?.