계절 효과가 동해 반일주조 내부조석파의 생성과 전파에 미치는 영향

Abstract

This talk presents seasonal changes of semi-diurnal internal tides in the East/Japan Sea using 2-year-long outputs from the real-time ocean forecasting system operated by Kyushu University. The model composes a forecasting system nudging temperature and salinity fields to reproduce realistic oceanic currents and stratification. In addition to atmospheric forcings, it also includes tidal forcings of 16 major components along open boundaries. Simulated barotropic tides agree well with coastal tide-gauge and shipboard ADCP measurements. The model generates energetic semi-diurnal internal tides around the northern mouth of the Korea Strait where the barotropic tides encounter a sudden depth change of continental shelf slope. Simulated amplitude and phase of semi-diurnal internal tides agree well with two hourly-interval 25-hour CTD castings obtained during spring and neap tidal periods at a site near the internal tide generation region. Converted energy from barotropic to baroclinic (internal) tides has seasonal variation ranging 0.07&#8722 0.08 GW during summer and 0.02&#8722 0.03 GW during winter due to stratification changes near the internal tide generation region. Generated internal tides travel far to the northern part of the East/Japan Sea during summer but not during winter. Propagating distance of internal tide energy appears to be associated with not only its generation intensity but also its wavelength. Longermperature and salinity fields to reproduce realistic oceanic currents and stratification. In addition to atmospheric forcings, it also includes tidal forcings of 16 major components along open boundaries. Simulated barotropic tides agree well with coastal tide-gauge and shipboard ADCP measurements. The model generates energetic semi-diurnal internal tides around the northern mouth of the Korea Strait where the barotropic tides encounter a sudden depth change of continental shelf slope. Simulated amplitude and phase of semi-diurnal internal tides agree well with two hourly-interval 25-hour CTD castings obtained during spring and neap tidal periods at a site near the internal tide generation region. Converted energy from barotropic to baroclinic (internal) tides has seasonal variation ranging 0.07&#8722 0.08 GW during summer and 0.02&#8722 0.03 GW during winter due to stratification changes near the internal tide generation region. Generated internal tides travel far to the northern part of the East/Japan Sea during summer but not during winter. Propagating distance of internal tide energy appears to be associated with not only its generation intensity but also its wavelength. Longer