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Study on intraseasonal signal in the tropical region of western Pacific-Indian Oceans

西太平洋-印度洋热带区季节内信号研究

基本信息

批准号：
12640424
负责人：
KUTSUWADA Kunio
金额：
$ 1.73万
依托单位：
TOKAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640424/
关键词：
Intraseasonal Variability Surface Current Tropical Pacific Scatterometter El Nifio Indian Ocean

项目摘要

The first result in the present study is description of intraseasonal signals in the upper layer of the tropical Pacific Ocean using time series data which have been measured by oceanic buoys in the study area between 8゜N and 8゜S. We focused prominent depth, area and period and persistent time of the signal and clarified time and space characters of the intraseasonal signal. The results revealed that, during the 1997-98 EI Nino event which was the largest one in the 20^<th> century, the signal has its contrastive vertical structure between the western and eastern portions with a boundary near the dateline, Father, our study suggested that surface wind variation with intraseasonal time scale over the tropical Indian-Pacific Oceans plays an important role for development of the oceanic signal.The second result is to document these surface wind changes over the tropical Indian-Pacific Oceans. We used satellite scatterometer data which have been available in the recent years. Using these time series data, we constructed gridded data set in our study area, and analyzed wind variability in the intraseasonal period band. The result revealed that the intraseasonal signal in the tropical region has large amplitude in the western Pacific and Indian sectors, and its zonally propagation structure. In particular, we clarified not only eastward propagation of the signal in the onset phase of 1997-98 EI Nino event which was pointed out by previous studies but also westward propagating feature which is dominant in the mature phase of the event.The Above results were presented in the international meetings as well as domestic ones and submitted to scientific journals. Some of them were published yet or will be published in near future.

本研究的第一个结果是利用海洋浮标在研究区域8 ° N和8 ° S之间测量的时间序列数据描述热带太平洋上层的季节内信号。重点分析了信号的显著深度、区域、周期和持续时间，阐明了季节内信号的时空特征。结果表明，在20世纪最大的一次厄尔尼诺事件（1997-98年）中<th>，信号具有东西两部分的对比垂直结构，其分界线在日界线附近。Father，我们的研究表明热带印度洋-太平洋海面风场季节内时间尺度的变化对海洋信号的发展起着重要作用。我们使用的卫星散射仪数据，已在最近几年。利用这些时间序列资料，我们构建了网格化的数据集，并分析了风的季节内周期带的变化。结果表明，热带地区的季节内信号在西太平洋和印度区具有较大的振幅，其传播结构具有纬向性。特别地，我们不仅阐明了前人研究中指出的1997-98年厄尔尼诺事件爆发阶段信号的东传特征，而且阐明了事件成熟阶段信号的向西传特征，并在国内外会议上发表了上述结果，并提交给科学期刊。其中一些已经出版或将在不久的将来出版。