We serve netCDF data by means of a thredds server. NetCDF files from which the maps were made (and other additional data) can be downloaded from THREDDS service
If you select a data set, you can consult their own catalogue. The data can be downloaded from each catalogue following the links OPENDAP, HTTPServer or NetcdfSubset. The data files are password protected but you can obtain your login data by filling the form at the end of this page
If you are interested into automatically download some netCDF products use our getBEC bash script