Ocean Dynamics and Climate in the Western Pacific

西太平洋的海洋动力学和气候

基本信息

批准号：
05044034
负责人：
YAMAGATA Toshio
金额：
$ 5.12万
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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05044034/
关键词：
Climate Variability The Equatorial Jets A Coupled Atmosphere-Ocean Model Kuroshio A High-resolution Ocean General Circulation Mode IOC WESTPAC GCOS GOOS WCRP CLIVAR

项目摘要

The present international cooperative research on the ocean dynamics and climate issues in the western Pacific Ocean was promoted as a part of ODC (Ocean Dynamics and Climate) program under the IOC/WESTPAC.In particular, we facilitated cooperative researches using an oceanic general circulation model, exchange of observed data, the arrangement of observation plans among the related countries. The following are the main outcomes of the present research program.1) A high-resolution Indo-Pacific oceanic general circulation model (OGCM) demonstrates that the seasonal variation of the sea level around Southeast Asia is governed by the local monsoonal winds and the equatorial Kelvin Jets generated remotely during the transition period of the monsoon in the central and eastern Indian Ocean. It also shows that the semiannual aspect appeared in the transport through the Lombok Strait results from the reduction of the posotive pressure gradient across the strait due to the propagation of the Kel … More vin Jets along the southern coast of Indonesia. To detect the surface current fields associated with those jets, surface drifting buoys are deployed off southern coast of Indonesia in November 1993 based on the result of model buoy trajectories simulated in the OGCM.2) We are successful in reproducing a detailed three-dimensional structure of Kuroshio south of Japan by use of a high-resolution OGCM which can predict the surface elevation explicitly. An analysis of a torque balance for the depth integrated transport indicates that the Kuroshio transport over the continental slope area west of Ryukyu Islands is strongly affected by an interaction between the ocean and the solid earth through the bottom pressure torque.3) We analyzed the variations on intraseasonal to decadal time scale in temperature field in the western Pacific taken from satellites and/or hydrographic observations. Based on the analysis, we developed a new statistical method that can compute horizontal velocity fields from the temperature variability data.4) A coupled atmosphere-ocean model composed of the 2 1/2 layr ocean model developed in Nova University and a simple Gill-type atmospheric model or an atmospheric GCM is constructed and tested for the response of the equatorial ocean to the atmospheric intraseasonal disturbances and the monsoonal winds. During the development of the coupled model, we invited Professors McCreary and Lukas mainly to the University of Tokyo to review the research on the oceanic climate variability in the Indian and western Pacific Oceans, and organized a real time research network through the Internet to facilitate mutual communication among each country.5) At the JSC/Pacific Ocean Panel (chaired by Dr.Halpern), which was held at the Jet Propulsion Lab.in Los Angels, the present project was introduced as a core forerunner of a future intensive research program in the western Pacific under GCOS/GOOS and WCRP/CLIVAR.6) The results of the present project were presented at the ODC-2 session at the IOC/WESTPAC Symposium that was held in November 1994 at Bali, Indonesia. At the same symposium, we organized a workshop entitled "Special Session of Western Boundary Currents", and discussed in detail the oceanic climate variability in the western Pacific and the adjacent regions and on a future plan of the research in the regions. Papers presented at the workshop will be published in J.Geophy.Res.special issue edited by the principal investigator of the current program (T.Yamagata).7) Principal investigator is going to organize a symposium as a chief convenor, which focuses on the decadal and interdecadal oceanic climate variability, at the IUGG/IAPSO Meeting in August 1995 at Honolulu, Hawaii. Less

目前西太平洋海洋动力学和气候问题的国际合作研究是作为IOC/WESTPAC下的ODC（海洋动力学和气候）计划的一部分而推动的。特别是，我们利用海洋环流模型促进了合作研究、观测数据的交换、相关国家之间观测计划的安排如下是本研究计划的主要成果。1）高分辨率印度-太平洋大气环流模式（OGCM）表明，东南亚周围的海平面受印度洋中东部季风过渡期间远程产生的当地季风和赤道开尔文急流的控制，也表明在通过龙目海峡的运输中出现了半年期的现象。这是由于凯尔文喷射流沿印度尼西亚南部海岸传播而导致海峡正压梯度减小的结果。根据 OGCM 模拟浮标轨迹的结果，1993 年 11 月在印度尼西亚南部海岸部署了漂流浮标。2) 我们成功地利用高分辨率再现了日本南部黑潮的详细三维结构。 OGCM可以明确地预测表面高程，对深度强积分输运的扭矩平衡分析表明，琉球群岛以西大陆坡地区的黑潮输运受到相互作用的影响。 3）我们分析了通过卫星和/或水文观测获得的西太平洋温度场的季节内到年代际时间尺度的变化。 4）建立了由诺瓦大学开发的2 1/2层海洋模型和简单的Gill型大气模型或大气GCM组成的大气-海洋耦合模型并测试了响应赤道海洋对大气季节内扰动和季风的影响在耦合模型的开发过程中，我们主要邀请了东京大学的McCreary和Lukas教授回顾了印度洋和西太平洋海洋气候变化的研究。通过互联网组织了一个实时研究网络，以促进各国之间的相互交流。5) 在 JSC/太平洋小组（由 Halpern 博士主持）上，该小组在喷气推进系统举行洛杉矶实验室介绍了目前的项目，作为 GCOS/GOOS 和 WCRP/CLIVAR 下西太平洋未来强化研究计划的核心先驱。6) 目前项目的结果已在 ODC-2 会议上介绍1994年11月在印度尼西亚巴厘岛举行的IOC/WESTPAC研讨会上，我们组织了题为“西部边界流特别会议”的研讨会，并详细讨论了这一问题。西太平洋和邻近地区的海洋气候变化以及该地区的研究的未来计划研讨会上发表的论文将发表在由当前项目的主要研究员编辑的 J.Geophy.Res.特刊上。 T. Yamagata).7) 首席研究员将作为首席召集人在 1995 年 8 月的 IUGG/IAPSO 会议上组织一次研讨会，重点讨论十年间和十年间海洋气候变率，夏威夷檀香山。