In Japan Sea, effects of submesoscale dynamics on the mean structure, eddies, etc. have not been fully understood yet. Towards a rigorous submesoscale Japan Sea modeling, a detailed oceanic downscaling experiment is conducted with a double nested ROMS at horizontal resolutions of 3 km (ROMS-L1) and 1 km (L2), forced by the assimilative JCOPE2 at 1/12 deg. as the lateral boundary condition. The results from ROMS-L1, L2 and JCOPE2 are compared to the observation and satellite altimetry dataset to show a good agreement with an appropriate parameter choice. Submesoscale eddies are quite active in the southern half of Japan Sea, leading to enhancement of prevailing Tsushima and Liman Currents.
