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

目前研究中的第一个结果描述了热带太平洋海洋上层中的内部信号使用时间序列中的数据，其中数据被8 ° N和8 ° S之间的海洋生物测量了。我们专注于信号中信号的显著深度、区域和周期以及持续时间的信号和明确的时间和空间特征。结果公布，1997-98年EI Nino事件是20世纪最大的事件之一，<th>信号在西部和东部地区之间具有对比性的垂直结构，与数据线附近的边界、父亲、我们的研究建议，表面风的变化与热带印第安人-太平洋海洋之间的内部时间尺度为海洋信号的发展发挥了重要作用。第二个结果将有助于说明这些表面风的变化。我们使用了卫星散射计数据，这些数据在过去几年中一直可用。使用这些时间序列数据，我们在我们的研究区域构建的网格数据集，并在内部周期波段中分析风的变异性。结果揭示了热带地区的内部信号在西太平洋和印度部门具有较大的幅度，及其区域传播结构。在具体方面，我们并不只是澄清1997-98年EI Nino事件在设定阶段的信号的东方传播，其中一些突出了先前的研究，但同样，西方传播的特征在事件的成熟阶段占主导地位。在国际会议上提出的结果是，作为一个很好的领域，并提交给了科学期刊。他们中的一些人已经出版了，或者将在不久的将来出版。

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.