Hi Ying,I've mentioned this to you via email already, but I'll add it to the thread in case others run into this issue. Besides setting SSTICE_DATA_FILENAME and SSTICE_GRID_FILENAME, you also need to set two variables in user_nl_docn: fillalgo = "copy"mapread = [link to an fv0.23x0.31 -> ne120np4 mapping file] I've made a mapping file for your specific case, it's on yellowstone at/glade/p/work/mlevy/codes/mapping_trunk/gen_mapping_files/gen_ESMF_mapping_file/map_fv0.23x0.31_TO_ne120np4_blin.141210.ncI recommend copying that to your own directory and linking from there, from time to time I delete the mapping files I've made.~Mike