GISS "normal year" data as described in NCAR Tech Note 460 GISS lwdn lwdn swdn swdn swup swup tn460nyf.giss.T62.051007.nc time lon lat area mask tn460nyf.giss.T62.051007.nc cp:/fis/cgd/cseg/csm/inputdata/atm/datm7/TN460/