This study projects environmental changes of Seto-Inland Sea in Japan based on the Regional Ocean Modeling System (ROMS) considering CMIP5 ensemble results. The future change of atmospheric temperature, humidity, cloud fraction, wind speed, sea level pressure, short wave radiation and long wave radiation are analyzed by 50 GCM ensemble for RCP4.5 and 8.5 scenarios. The future change of ocean temperature, salinity and currents are projected by the ROMS in present and future climate conditions. The future change of temperature is not uniformly distributed over the Seto-Inland Sea and depends on the local water depth and circulations.
