M2 baroclinic tide variability modulated by the ocean circulation south of Japan
M2 baroclinic tide variability modulated by the ocean circulation south of Japan
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DOI：
10.1002/2015jc010739
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发表时间：
2015-05
影响因子：
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通讯作者：
S. Varlamov;Xinyu Guo;T. Miyama;K. Ichikawa;T. Waseda;Y. Miyazawa
中科院分区：
文献类型：
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作者：
S. Varlamov;Xinyu Guo;T. Miyama;K. Ichikawa;T. Waseda;Y. Miyazawa
我们使用覆盖西北太平洋、水平分辨率为1/36°的数据同化海洋环流模型分析了海洋环流和潮汐流的并行模拟结果，以研究它们之间可能的相互作用。卫星观测和模拟均检测到了吐噶喇海峡、伊豆海岭、吕宋海峡、小笠原海岭等4个公海M2内潮汐变化活跃的地点（热点）。模拟M2斜压潮汐的能量循环分析表明存在两种类型的热点：耗散（吐噶喇海峡和伊豆海岭）和辐射（吕宋海峡和小笠原海岭）主导位点。热点处从正压到斜压 M2 潮汐的能量转换受到密度场低频变化的显着调节。两个地点（吐噶喇海峡和伊豆海岭）的调制受到黑潮路径变化以及浅温跃层季节变化的影响。在另外两个地点，黑潮侵入南海（吕宋地层）引起的相对较深的层结变化和中尺度涡旋活动（小笠原海脊）的影响在调制中占主导地位。
We analyze a concurrent simulation result of the ocean circulation and tidal currents using a data-assimilative ocean general circulation model covering the Western North Pacific with horizontal resolution of 1/36° to investigate possible interactions between them. Four sites of active M2 internal tide variability in open ocean (hot spots), such as Tokara Strait, Izu Ridge, Luzon Strait, and Ogasawara Ridge, are detected from both the satellite observation and the simulation. Energy cycle analysis of the simulated M2 baroclinic tide indicates two types of the hot spots: dissipation (Tokara Strait and Izu Ridge) and radiation (Luzon Strait and Ogasawara Ridge) dominant sites. Energy conversion from barotropic to baroclinic M2 tides at the hot spots is modulated considerably by the lower-frequency changes in the density field. Modulation at the two spots (Tokara Strait and Izu Ridge) is affected by the Kuroshio path variation together with the seasonal variation of the shallow thermocline. At the other two sites, influence from changes in the relatively deep stratification through the Kuroshio intrusion into South China Sea (Luzon Strat) and mesoscale eddy activity (Ogasawara Ridge) is dominant in the modulation.