addfile("http://iridl.ldeo.columbia.edu/SOURCES/.ARCTIC/.STATION/Fr/1+index/.Fa/ISTA+differences/2+index/.O18/3+index/.Sal/4+index/.Depth/dods","r")If you have questions, comments, or problems please use the help@iri link. This page will evolve as we learn more about how NCL handles data downloads, and your help pointing out problems is much appreciated.
*DODS (a.k.a. OpenDAP) is not necessarily installed in NCL and if OpenDAP is not installed, giving NCL a URL instead of a local file name will result in a file-not-found error. In that case, you can use addfile after you download the netcdf file.