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A Study on the Biomodal Path Dynamics of the Kuroshio South of Japan and Their Transformation Process between the Straight Path and the Large Meander Path.

日本南部黑潮生物模态路径动力学及其直线路径与大曲流路径转换过程的研究。

基本信息

批准号：
05640475
负责人：
SEKINE Yoshihiko
金额：
$ 1.02万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

The bimodal path dynamics of the Kuroshio and their transformation process have been examined in the course of this study. In the first year, a flat bottom model with realistic coastal topographies south of Japan was assumed and the coastal topographic effect was examined. It has been pointed out that the transformation from straight path to large meander path is due to the positive vorticity supply from the Cape Muroto and Kii Penisula. Conversely, the transformation from the large meander path to the straight path is caused by no supply of the positive vorticity by the separated current path from the coastal topographies. In this second year, bottom topographies south of Japan is further included in the numerical model and their effects are examined. It is shown that the large meander path commonly separates from the Cape Muroto. If only the coastal topography of Kii Peninsula is excluded from the model, separation of the mean flow is carried out at the Cape Muroto. However, the sepa … More ration point shifts to east of the Cape Muroto, if the coastal topography of the Cape Muroto is excluded. If the coastal topographies of the Cape Muroto and Kii Peninsula are excluded, the separation point shifts further downstream. It is demonstrated that topographic effect of the Cape Muroto has an important influence on the bimodal path dynamics of the Kuroshio. Because of the stabilization effect of the bottom slope, large meander path is formed only in the case with large in- and outflow of 80 Sv and small eddy viscosity. It is suggested that the large meander path is formed through the baroclinic instability under the condition of strong nonlinear system. The two papers describing these results were accepted to La mer and they are now in printing. These results give important views for a future study on the Kuroshio. However, corresponding study on the observational data analyzes are still lacking. Then, I performed three sectional observations across the Kuroshio and I am now examining results of the observation. The topographic effect of Cape Muroto will be dicussed by use of the historical observational data. Less

研究了黑潮的双峰路径动力学及其转化过程。在第一年，假设了一个具有日本南部真实海岸地形的平底模式，并检查了海岸地形的影响。指出从直线路径到大弯曲路径的转变是由于来自Muroto角和Kii Penisula的正涡度供应。相反，从大弯曲路径到直线路径的转变是由于沿海地形分离的洋流路径不提供正涡度造成的。在这第二年，日本南部的海底地形被进一步包括在数值模式中，并检查了它们的影响。结果表明，大的曲折路径通常与莫罗托角分开。如果只从模式中剔除Kii半岛的沿海地形，则在Muroto角进行平均气流的分离。然而，环保总局…如果剔除室东角的沿海地形，更多的配给点将转移到室东角以东。如果排除室东角和奇伊半岛的沿海地形，分隔点将进一步向下游移动。结果表明，Muroto角的地形效应对黑潮的双峰路径动力学有重要影响。由于底坡的稳定作用，只有在80Sv的大进出流和小的涡粘性的情况下，才会形成大的曲流道。认为在强非线性系统条件下，大弯曲路径是通过斜压不稳定形成的。描述这些结果的两篇论文被La mer接受，目前正在印刷中。这些结果为今后黑潮的研究提供了重要的意见。然而，对观测数据分析的相应研究还很缺乏。然后，我对黑潮进行了三次横断面观测，现在我正在检查观测结果。利用历史观测资料讨论了室东角的地形效应。较少