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Numerical study of upper ocean response to a typhoon moving zonally across the Luzon Strait

机译：上层海洋对台风横越吕宋海峡的响应的数值研究

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摘要

The Luzon Strait (LS) is a wide channel between Taiwan and the Luzon islands. Eastward of the LS, the Kuroshio Current (KC) flows northward along the eastern coasts of Luzon and Taiwan. A typhoon is a strong and localized low-pressure weather system that occurs frequently in the vicinity of the Taiwan area. One typical typhoon track, passing through the seas surrounding Taiwan, is a zonal path across the LS. The satellite measured SST, corresponding to typhoons Pabuk (5 Aug. 2007-12 Aug. 2007) and Dujuan (29 Aug. 2003-5 Sep. 2003), which both moved along this path, demonstrated that a classic right bias cooling occurs to the north of the storm track, during the typhoon forced period. However, some cold anomaly water also present toward left (south) of the storm track east of the LS in the relaxation period. This paper adopted a three-dimensional hydrostatic primitive equation model to study the possible causes of this southward transport of cold waters. Both model results and the observed SST anomaly revealed that the strength of the upper ocean cooling depends on whether a resonant regime between the typhoon winds and the near-inertial currents can be excited. To the east of the LS, the convergence between the warm Kuroshio water and the cold wakes in the poststorm period will enhance the southward spreading of cold anomaly water. The enhanced vertical mixing, induced by the southward propagation of nearly inertial waves associated with the cold wakes, can also produce some cold anomaly to the south of a storm track in the poststorm period. Both mechanisms can contribute to the occurrence of some cold anomaly water to the south of the storm track east of the KC. To the west of the LS, the convergence between the warm Kuroshio water and the cold upwelling water from the northern South China Sea can further strengthen the Kuroshio front in the LS.
机译：吕宋海峡（LS）是台湾与吕宋岛之间的宽阔通道。 LS的东面，黑潮（KC）沿着吕宋岛和台湾的东海岸向北流动。台风是一种强而局部的低压天气系统，经常在台湾地区附近发生。一条穿越台湾海域的典型台风路径是横穿LS的纬向路径。卫星测得的海表温度（SST）分别对应于台风帕布克（2007年8月5日至2007年8月12日）和杜娟（2003年8月29日至2003年9月5日），这两个卫星都沿着这条路径移动，这表明经典的右偏冷却发生在在台风强迫期间，风暴路径的北部。但是，在松弛期中，一些冷异常水也向着LS东侧风暴道的左侧（南部）出现。本文采用三维静水原始方程模型来研究这种向南输送冷水的可能原因。模型结果和观测到的海表温度异常都表明，上层海洋冷却的强度取决于台风和近惯性流之间的共振状态是否可以被激发。在LS东部，暴风后时期黑潮暖水和冷尾流之间的汇合将增强冷异常水的向南扩散。由与冷尾流相关的近乎惯性的波向南传播所引起的增强的垂直混合，在风暴后时期也可在风暴道以南产生一些冷异常。这两种机制都可能导致在KC以东的风暴轨道以南出现一些冷异常水。在LS的西部，黑潮的暖水和南海北部北部上升的冷水之间的汇聚可以进一步加强LS的黑潮锋线。

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  • 来源
    《Ocean Dynamics》 |2011年第11期|p.1783-1795|共13页
  • 作者

    Y.-C. Kuo; C.-S. Chern; J. Wang; Y.-L. Tsai;

  • 作者单位

    Institute of Oceanography, National Taiwan University,No. 1, Sec. 4, Roosevelt Road,Taipei 10617, Taiwan, Republic of China;

    Institute of Oceanography, National Taiwan University,No. 1, Sec. 4, Roosevelt Road,Taipei 10617, Taiwan, Republic of China;

    Institute of Oceanography, National Taiwan University,No. 1, Sec. 4, Roosevelt Road,Taipei 10617, Taiwan, Republic of China;

    Institute of Oceanography, National Taiwan University,No. 1, Sec. 4, Roosevelt Road,Taipei 10617, Taiwan, Republic of China;

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  • 正文语种 eng
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  • 关键词

    luzon strait; kuroshio; typhoon; ocean response;

    机译：吕宋海峡黑潮台风;海洋反应;

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