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

在这项研究过程中，已经检查了黑素木的双峰路径动力学及其转化过程。在第一年，假定具有现实的沿海地形的平坦底部模型，并检查了沿海地形效应。有人指出，从直路到大曲折路径的转变是由于Muroto角和Kii Penisula的正涡度供应。相反，从大蜿蜒路径到直路的转变是由于与沿海地形的分离电流路径无需供应正涡度。在第二年，日本南部的底层地形进一步包括在数值模型中，并检查了其效果。结果表明，大曲折路径通常与穆罗托角分离。如果仅从模型中排除KII半岛的沿海地形，则在Muroto角进行平均流量的分离。但是，如果排除了穆罗托角的沿海地形，则SEPA…更多的配给点转移到了穆罗托角的东部。如果排除了Muroto角和KII半岛的沿海地形，则分离点将进一步移动。已经证明，穆罗托角的地形效应对黑发的双峰路径动力学有重要影响。由于底坡的稳定效果，只有在80 sv和小涡流粘度的情况下才形成较大的蜿蜒路径。建议在强非线性系统的条件下通过斜压不稳定性形成大曲折路径。描述这些结果的两篇论文已被La Mer接受，现在正在印刷中。这些结果为将来的关于黑发的研究提供了重要的看法。但是，关于观察数据分析的相应研究仍然缺乏。然后，我在整个黑鲁西奥进行了三个分段观察结果，现在正在研究观察结果。穆罗托角的地形效应将通过使用历史观察数据来讨论。较少的