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Seasonal and interannual variations in the Indian Osean

印度海洋的季节和年际变化

基本信息

批准号：
06452085
负责人：
YAMAGATA Toshio
金额：
$ 4.67万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452085/
关键词：
Indian Ocean Ocean General Circulation Model Monsoon Seasonal Variations Interannual Variations Indonesian Throughflow Nondispersive Long Possby Waves Coastal Trapped Waves ロスビー長波海洋物理学吉田-Wyrtkiジェットケルビン・ジェット

项目摘要

A holizontally high resolution Indo-Pacific ocean general circulation model, which can resolve the detailed geometry and bottom topography in the Indonesian archipelago as well as the whole Indo-Pacific region, is developed and used to investigate seasonal and interannual variations in the upper layr thermal structure and the circulation in the Indian Ocean and the Indonesian Throughflow. The outcomes of this study are as follows :(1) Simulated seasonal variability of the Indonesian Throughflow, seasonal and interannual variations of the upper layr thermal structure in the Indian Ocean are both consistent with the observed data such as the XBT and CTD data, the sea surface height variations derived from satellites, the surface drifting buoys, and the tide gauge dada. This indicates that the numerical model is an efficient tool to investigate the seasonal and the interannual variability in the Indian Ocean.(2) The seasonal variability of the Lombok throughflow consists of the annual and … More the semiannual harmonics. While the annual siganl is forced by the local monsoonal winds over the Indonesian archipelago, the semiannual signal is associated remotely with the Kelvin waves generated twice a year during the monsoon transition time in the central equatorial Indian Ocean. On the other hand, the coastally trapped waves around Australasia, which are forced by the winds along the southwestern coast of Australia associated with the meridional movement of the southern hemisphere westerlies, play an important role in the seasonal transport variation through the Timor Sea. Furthermore, the simulated annual-mean Throughflow does not show the simple Sverdrup dynamical balance. It turns out that considerable concellation of terms in the momentum equation is involved in producing a near-Sverdrup balance in the model.(3) The seasonal and the interannual variations of the simulated and the observed depth of the 20ﾟC isotherm show a band of large amplitude between 8ﾟS and 20ﾟS across the Indian Ocean, and the signals propagate to the west. The generation of those signals is well explained by a simple model which consists of the local Ekman pumping velocity and the nondispersive, long Rossby waves. The signal radiating from the eastern boundary of the Indian Ocean contributes only about 10% of the annual signal ; however, it affects the interannual variations in the eastern part of the southern tropical Indian Ocean. Less

本文建立了一个能准确反映印度洋群岛乃至整个印度洋-太平洋地区的详细几何和海底地形的高分辨率印度洋-太平洋环流模式，并利用该模式研究了印度洋上层热力结构和环流的季节和年际变化以及印度洋环流和印度洋环流。研究结果表明：（1）模拟得到的印度尼西亚海流的季节变化、印度洋上层热结构的季节变化和年际变化与XBT、CTD、卫星海面高度变化、海面漂流浮标和验潮资料等观测资料相吻合。这表明数值模式是研究印度洋季节和年际变化的有效工具。(2)龙目岛贯穿流的季节变化包括年度和 ...更多信息半年度谐波虽然每年signanl被迫当地季风风在印度尼西亚群岛，半年的信号是远程相关的开尔文波产生一年两次的季风过渡时间在赤道印度洋中部。另一方面，澳大拉西亚周围的海岸被困波，这是由风沿着澳大利亚西南海岸与南半球西风带的纬向运动，通过帝汶海的季节性输送变化中起着重要的作用。此外，模拟的年平均环流没有表现出简单的Sverdrup动力平衡。事实证明，动量方程中相当多的项涉及在模型中产生近斯维尔德鲁普平衡。(3)20 ° C等温线模拟深度和观测深度的季节变化和年际变化表明，在8 ° S ~ 20 ° S之间，印度洋上存在一条大振幅带，信号向西传播。这些信号的产生很好地解释了一个简单的模型，其中包括当地的埃克曼泵速和非色散，长Rossby波。印度洋东部边界辐射的信号仅占全年信号的10%左右，但它影响着热带南印度洋东部的年际变化。少