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吐噶喇海峡内潮的能量收支和大小潮变化
郜婕1, 毛新燕2, 郭 新宇3
1.中国海洋大学 海洋与大气学院;2.中国海洋大学海洋与大气学院;3.中国海洋大学环境科学与工程学院
摘要:
基于水平分辨率为3公里的JCOPE-T水动力学模式结果分析表明,吐噶喇海峡的内潮主要产生在地形变化剧烈的海山和海岛附近,其引起的等密面起伏振幅可达30 m,产生后的内潮在垂直于等深线方向分为两支向外传播:一支向西北方向传播,进入东海陆架;另一支向东南方向传播,进入太平洋。吐噶喇海峡处潮能丰富,其在14个全日潮潮周期的平均计算显示,输入和输出该区域内的正压潮能量的差为13.92 GW,约有 3.73 GW转化为内潮能量。生成的内潮能量有77.2 %在当地耗散,传出的内潮能量为0.84 GW,主要通过西北和东南两个边界传出。大潮期间输入的正压潮能量约为小潮期间的两倍,其产生的内潮能量也约为两倍,但主要产生区基本不变。尽管大小潮期间,自正压潮转化为内潮的能量大小不同,但其能通量的传播方向并没有发生变化,仍主要通过西北和东南两个边界传出,且在当地的内潮能量耗散率均在76-79%之间。因此,大小潮的变化仅影响吐噶喇海峡处产生的内潮能量的大小,不影响其产生区域、传播方向和耗散率。
关键词:  吐噶喇海峡  内潮  大小潮  JCOPE-T
DOI:10.11693/hyhz20181000251
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
The energy budget and the spring-neap tidal changes of internal tide at Tokara strait
Gaojie,Mao Xinyan,GUO XINYU
1.Ocean University of China, College of Oceanic and Atmospheric Sciences;2.Ocean University of China, College of environmental Science and Engineering
Abstract:
The analysis of a 3 km horizontal resolution hydrodynamic model shows that the internal tide of the Tokara Strait with complex topography and stable stratification can cause significant isopycnal movements whose amplitude is up to 30 m. The internal tide at the Tokara Strait is mainly produced near the seamounts and islands where the topography changes drastically. After generation, the internal tides propagate outwards in the direction perpendicular to the isobaths: one is northwestward and finally enters the shelf of the East China Sea; the other is southeastward and enters the Pacific Ocean. The Tokara Strait is abundant in tidal energy. The average over 14 diurnal tidal periods shows that the barotropic energy propagated into the region is 13.92 GW, and 3.73 GW of which is converted into internal tidal energy. About 77.2% of the internal tidal energy is dissipated locally, while the others mainly transmit through the northwest and southeast boundaries. The input of the barotropic tidal energy during the spring tide is about twice that during the neap tide. Meanwhile the conversion rate from barotropic tide to baroclinic tide (internal tide) is also about twice. Even though, the main generation area and the propagation direction are basically unchanged, which still transmit mainly through the northwest and southeast boundaries. The dissipation rate of the internal tidal energy is between 76-79% in both the neap and spring tides. Therefore, the spring-neap tide only affects the amount of internal tidal energy generated at the Tokara Strait, but does not affect the area where it is generated, the direction of propagation, and the rate of dissipation.
Key words:  Tokara Strait  internal tide  spring-neap tide  JCOPE-T
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