POM模式在日本南部黑潮路径变异研究中的应用

发布时间：2018-03-28 18:19

本文选题：黑潮路径变异　切入点：POM(Princeton　出处：《海洋科学》2016年02期

【摘要】：日本南部黑潮路径变异对北太平洋地区的气候和环境具有显著的影响,对黑潮路径变异的研究具有重要的意义。本文利用POM(Princeton Ocean Model)数值模式模拟了日本南部黑潮的路径变异情况,分析了黑潮大弯曲路径形成的可能机制。研究结果表明,当黑潮处于非大弯曲路径时,相对位势涡度的平均值呈现递减趋势,说明日本南部低位势涡度水在不断积累,这样会使得四国再循环流的强度增强,迫使黑潮保持平直路径,同时,近岸黑潮垂直流速剪切增大,斜压不稳定性的作用也逐渐增大;当黑潮从非大弯曲路径向大弯曲路径过渡时,再循环流强度的减弱会导致黑潮的流速剪切减小。根据海表高度异常场以及海洋上层流场信息发现,近岸黑潮附近的气旋涡会随着再循环流区域反气旋涡的东侧向南运动,最终导致黑潮大弯曲的发生。分析涡流的能量,结果显示,黑潮大弯曲路径的形成与斜压不稳定性密切相关。
[Abstract]:The Kuroshio path variation in southern Japan has a significant impact on the climate and environment in the North Pacific and is of great significance to the study of Kuroshio path variation. In this paper, the POM(Princeton Ocean Model is used to simulate the Kuroshio path variation in southern Japan. The possible mechanism of the formation of the Kuroshio great bend path is analyzed. The results show that the mean value of relative potential vorticity decreases when the Kuroshio is in the non-large bend path, indicating that the low potential vorticity water is accumulating continuously in southern Japan. This will increase the intensity of the recirculation flow and force the Kuroshio to maintain a straight path. At the same time the vertical velocity shear of the Kuroshio increases and the effect of baroclinic instability increases gradually. When the Kuroshio transitions from a non-large curved path to a large curved path, the intensity of the recirculating current decreases the velocity shearing of the Kuroshio. Based on the information of the sea surface height anomaly field and the upper ocean current field, it is found that the velocity shearing of the Kuroshio will decrease. The vortex near the Kuroshio on the shore will move southward along the east side of the reverse vortex in the recirculating flow region, resulting in the occurrence of the great curvature of the Kuroshio. The analysis of the energy of the vortex shows that, The formation of the Kuroshio great bend path is closely related to baroclinic instability.
【作者单位】：中国科学院海洋研究所;中国科学院大学;河南大学;
【基金】：国家自然科学基金(41230420)~~
【分类号】：P731.27

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