POM and Two-Way Nesting POM Study of Kuroshio Damping Phenomenon Caused by a Strong Wind
POM and Two-Way Nesting POM Study of Kuroshio Damping Phenomenon Caused by a Strong Wind
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DOI：
10.1023/a:1011151616714
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发表时间：
2000-06
影响因子：
2.3
通讯作者：
Y. Miyazawa;Shinya Minato
中科院分区：
文献类型：
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作者：
Y. Miyazawa;Shinya Minato
利用普林斯顿海洋模式（POM）及其双向嵌套模式，研究了一次强风引起的几天尺度黑潮阻尼现象。我们模拟了一个理想化的东向黑潮在纬向通道的流入/流出条件的西/东边界，并研究了理想化的黑潮的强东风的响应。本研究的动机是日本气象厅研究船Shumpu Maru的观测，该观测报告了6804号台风袭击前后黑潮的等密度线变形和阻尼。等密度线的变形和黑潮的阻尼与风应力的大小、层结的强度、黑潮离海岸的距离以及网格的分辨率有关。等密度线的变形与陆上Ekman输运辐散/辐合引起的垂直环流型有关。一个简单的分层模式组成的Niiler（1969）的修改Ekman传输和海岸边界的阻尼现象提出了解释。为了研究黑潮阻尼机制在三维空间中是否有效，在其他实验中加入了理想化的海角。新开发的双向嵌套模型的POM适用于本实验，并有可能澄清更详细的功能，在嵌套区域的响应比粗网格模型。
A Kuroshio damping phenomenon of a few days scale caused by a strong wind was studied using the Princeton Ocean Model (POM) and a two-way nesting model for the POM. We simulated an idealized eastward Kuroshio in a zonal channel in terms of the inflow/outflow condition at the western/eastern boundaries and examined responses of the idealized Kuroshio to a strong easterly wind. This study was motivated by observations of JMA research vessel Shumpu Maru which reported deformation of isopycnals and damping of the Kuroshio before and after the attack of Typhoon 6804. Deformation of isopycnals and damping of the Kuroshio are found to depend on magnitude of wind stress, intensity of stratification, distance of the Kuroshio from coast, and grid resolution. The deformation of isopycnals is related to the vertical circulation pattern caused by the divergence/convergence of the onshore Ekman transport. A simple stratification model composed of Niiler (1969)'s modification of the Ekman transport and the coastal boundary is proposed to explain the damping phenomenon. An idealized cape was added in other experiments in order to study whether the Kuroshio damping mechanism discussed here works in three dimensions. The newly developed two-way nesting model for the POM was applied for this experiment and made it possible to clarify more detailed features of response in the nested area than did the coarse grid model.