Variability of Western Boundary Currents

西部边界流的变化

基本信息

批准号：
07044068
负责人：
YAMAGATA Toshio
金额：
$ 9.6万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044068/
关键词：
Ocean General Circulation Model Indonesian Throughflow Luzon Undercurrent JEBAR Intermediate Water Western Pacific Kuroshio Sri Lanka Dome TOPEX POSEIDON

项目摘要

Ocean general circulation models have been improved dramatically in recent years ; we are now able to compare directly results from models with in situ observations. In the present study we have accelerated this movement in close cooperation with international colleagues who show strong interests in the western boundary currents in the western Pacific. Our final goal is to provide high-resolution ocean models for practical purposes such as daily ocean current prediction. On the basis of last two-years' international cooperative research, we have been successful in achieving several important scientific findings as well as improvement of ocean models. First, we have demonstrated the role of the joint effect of baroclinicity and bottom relief on the Kuroshio transport variations. Secondly, we have discovered and named <the Luzon Undercurrent> both in models and in situ observations obtained during US-PRC WOCE cruises. Thirdly, we have studied in full depth the seasonal variations of the Indonesian Throughflow and published a special issue of J.Geophys.Res. We have distributed 50 reprint volumes all over the world. Fourthly, we have analyzed Russian data for the formation of lenses composed of the intermediate water. Fifthly, based on the model results, we have found the Sri Lanka Dome and Bay of Bengal Dome in the Indian Ocean and confirmed the existence by the new Levitus data as well as the TOPEX/POSEIDON satellite altimetry data. In addition, we have checked the model performance by comparing surface drifter data and model variability particulary for synoptic scale phenomena of the Kuroshio. It has turned out that the model variability is still weaker than reality. Therefore, it is necessary to introduce further high-resolution models with improved sub-grid scale parameterization. We are planning to do this on the basis of the present accomplishment.

近年来，海洋一般循环模型已大大改善。现在，我们能够将模型与原位观察结果直接进行比较。在本研究中，我们与国际同事密切合作，在西太平洋西部边界潮流中表现出强烈的兴趣。我们的最终目标是出于实际目的提供高分辨率海洋模型，例如每日海洋当前预测。在过去两年的国际合作研究的基础上，我们成功地取得了一些重要的科学发现以及海洋模型的改进。首先，我们已经证明了斜视性和底部浮雕对黑发转运变化的关节作用。其次，我们在模型和在US-PRC WOCE巡航期间获得的现场观察结果都发现并命名为<luzon Undercurrent>。第三，我们已经深入研究了印尼遍布季节性变化，并发表了J.Geophys.res的特刊。我们在世界各地分发了50幅重印量。第四，我们分析了俄罗斯数据，以形成由中等水组成的镜头。第五，根据模型的结果，我们发现了印度洋的斯里兰卡圆顶和孟加拉湾圆顶，并通过新的Levitus Data以及Topex/Poseidon卫星卫星高度数据确认了存在。此外，我们通过比较表面漂移器的数据和模型变异性来检查模型性能，以示符合黑发的天气量表现象。事实证明，模型的可变性仍然比现实弱。因此，有必要引入进一步的高分辨率模型，以改进的子网格尺度参数化。我们计划基于目前的成就来做到这一点。