Seasonal variability of internal tides around the Korea Strait: 3-D high-resolution model simulation
Seasonal variability of internal tides around the Korea Strait: 3-D high-resolution model simulation
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朝鲜海峡周围内潮汐的季节变化：3D高分辨率模型模拟
DOI：
10.4217/opr.2014.36.1.001
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发表时间：
2014
影响因子：
--
通讯作者：
H. K. Ha
中科院分区：
文献类型：
--
作者：
Hyun Jung Lee;Ho Jin Lee;Jaehun Park;H. K. Ha
本文利用区域海洋模拟系统（Regional Ocean Modeling System， ROMS）的三维高分辨率模式研究了朝鲜海峡周围内部潮汐的产生和传播的时空变化。通过与部署在朝鲜海峡的12个声学多普勒电流剖面仪（ADCPs）阵列的现场电流测量结果进行比较，验证了模型的结果。利用2月和8月的模拟结果计算了内部潮汐能的通量和分布。分析表明，在朝鲜海峡陆架断裂带附近（35.5 o N, 130 o ~130.5 o E），强烈的跨坡正压潮汐流与突然的地形变化相互作用，产生了高能的半日内潮。夏季产生的半日内潮汐能值约为冬季的两倍。半日内潮的传播也显示季节变化。在2月份，由于朝鲜海峡的弱分层，大部分半日内潮只传播到东海的开阔盆地，阻碍了它们向西南方向传播。在8月，由于强烈的分层作用，它们沿着朝鲜海峡西部通道向西南方向移动至35.2 o N。此外，在对马岛以西地区产生的半日内潮也会传播到釜山海岸。这可以解释为夏季朝鲜海峡西部通道底部冷水的强烈入侵导致分层加剧。
This study investigates spatial and temporal variations in the generation and propagation of internal tides around the Korea Strait using a three-dimensional high resolution model (Regional Ocean Modeling System; ROMS). The model results were verified through comparison with in-situ current measurements from an array of 12 acoustic Doppler current profilers (ADCPs) deployed in the Korea Strait. Fluxes and distributions of internal tidal energy were calculated using simulation results gathered in February and August. Our analyses reveal that energetic semidiurnal internal tides are generated in a region around the Korea Strait shelf break (35.5 o N, 130 o ~130.5 o E), where the strong cross-slope semidiurnal barotropic tidal currents interact with a sudden topographical change. The semidiurnal internal tidal energy generated in summer displays values about twice as large as values in winter. Propagation of semidiurnal internal tides also reveals seasonal variability. In February, most of the semidiurnal internal tides propagate only into the open basin of the East Sea due to weak stratification in the Korea Strait, which inhibits their southwestward propagation. In August, they propagate southwestward to 35.2 o N along the western channel of the Korea Strait because of strong stratification. In addition, semidiurnal internal tides generated in a region west of Tsushima Island are found to propagate to the coast of Busan. This can be explained by the intensified stratification due to the strong intrusion of bottom cold water in the western channel of the Korea Strait during summer.
影响因子：
3.6
作者：
Niwa, Y;Hibiya, T
通讯作者：
Hibiya, T