Seasonal variation of semidiurnal internal tides in the East/Japan Sea

被引:35
|
作者
Jeon, Chanhyung [1 ]
Park, Jae-Hun [1 ]
Varlamov, Sergey M. [2 ]
Yoon, Jong-Hwan [3 ]
Kim, Young Ho [1 ]
Seo, Seongbong [1 ]
Park, Young-Gyu [1 ]
Min, Hong Sik [1 ]
Lee, Jae Hak [1 ]
Kim, Cheol-Ho [1 ]
机构
[1] Korea Inst Ocean Sci & Technol, Ocean Circulat & Climate Res Div, Ansan, South Korea
[2] Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan
[3] Kyushu Univ, Res Inst Appl Mech, Fukuoka 812, Japan
关键词
semidiurnal internal tides; seasonality; generation; propagation and dissipation; East; Japan Sea; TSUSHIMA WARM CURRENT; STRAITS; SURFACE; CIRCULATION; TRANSPORT; CURRENTS; LAYER;
D O I
10.1002/2014JC009864
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The seasonal variation of semidiurnal internal tides in the East/Japan Sea was investigated using 25 month long output from a real-time ocean forecasting system. The z coordinate eddy-resolving high-resolution numerical model, called the RIAM ocean model, incorporates data assimilation that nudges temperature and salinity fields together with volume transport through the Korea Strait to produce realistic oceanic currents and stratification. In addition to atmospheric forcing, it includes tidal forcing of 16 major components along open boundaries. The model generates energetic semidiurnal internal tides around the northern entrance of the Korea Strait. Energy conversion from barotropic to baroclinic (internal) tides varies seasonally with maxima in September (ranging 0.48-0.52 GW) and minima in March (ranging 0.11-0.16 GW). This seasonal variation is induced by the seasonality in stratification near the southwestern East/Japan Sea. The propagation distance of the internal tides is associated with generation intensity and wavelength. From late summer to early winter, the semidiurnal internal tides travel relatively far from the generation region due to stratification changes; its energy dissipates less as a result of longer wavelengths. Our results suggest that spatiotemporal variation of internal-tide-induced mixing due to the seasonality in the generation, propagation, and dissipation of internal tides should be considered for a more realistic simulation of water masses and circulation in models of the East/Japan Sea.
引用
收藏
页码:2843 / 2859
页数:17
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