Dear all ;

I won't to use era40 data from ECMWF site to make a simulation over a subdomain for september 1969. I download two files ( pressure and surface ) in netcdf format.My question is :

how can I use them for initial and boundry data ? the two files should be merged on a single file an named as param.year.hour.nc or used separetly.

thanks.

a.fekih