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Modification of equatorial disturbances over Indonesia maritime continent and its climatological significance

印度尼西亚海洋大陆赤道扰动的修正及其气候意义

基本信息

批准号：
13440141
负责人：
YAMANAKA Manabu d.
金额：
$ 7.94万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The objective of this study was to clarify the modification and re-organization of equatorial convective cloud disturbances over the Indonesia maritime continent between Indian and Pacific Oceans. We did (i) establishment of study infrastructure, (ii) construction of database, (iii) analysis of convective cloud systems and their organization, and (iv) theoretical consideration on convection system organization.In the first year (FY 2001) we constructed (i) by installing a computer. We collected observational data for (ii), and analyzed them for (iii). We also started to study (iv). In the second year (FY 2002) we compared (ii) with data of satellite observations and objective analysis. Concerning (iii), we found out a giant diurnal cycle of cloud systems over the whole of Sumatera Island : Generation along the central mountain ridge during afternoon and midnight, and movement both westward and eastward until morning. We also found suppression of such a diurnal cycle in a dry phase of infra-seasonal variations (intermediate of super cloud clusters) moving eastward from Indian Ocean. Concerning (iv), we studied the equation system for horizontal convection (or inertio-gravity waves) which describing both local and meridional circulations.In the final year (FY 2003) we complete the study. As for (iii) we found that the diurnal cycle of westward movement appears more frequently (almost throughout a year over the whole of Sumatera Island), whereas the eastward movement is limited inside the inter-tropical convergence zone (ITCZ) shifting north-southward over Sumatera Island with an annual cycle. Concerning (iv) a numerical calculation was also tried to simulate the diurnal cycle of cloud generation and movement.These results were presented in international meetings and journals, and summarized in a report booklet.

本研究的目的是澄清印度洋和太平洋之间的印度尼西亚海洋大陆上空赤道对流云扰动的修改和重组。本研究首先进行了研究基础设施的建立、数据库的建立、对流云系及其组织的分析、对流云系组织的理论思考等工作。第一年（2001年度），通过设置计算机，进行了（i）研究基础设施的建立、数据库的建立、对流云系及其组织的分析、对流云系组织的理论思考等工作。我们收集了（ii）的观测数据，并对（iii）进行了分析。我们也开始研究（四）。在第二年（2002财政年度），我们比较（ii）与卫星观测数据和客观分析。关于（iii），我们发现整个苏门答腊岛云系的一个巨大的日循环：在下午和午夜沿着中央山脉沿着生成，并向西和向东移动，直到早上。我们还发现这样的日周期抑制在干燥阶段的季节内变化（中间的超级云团）从印度洋向东移动。关于（iv），我们研究了描述局地和纬向环流的水平对流（或重力惯性波）方程组，并在最后一年（2003财年）完成了研究。至于（iii），我们发现，向西运动的日周期出现更频繁（几乎全年在整个苏门答腊岛），而东向运动是有限的热带辐合带（ITCZ）内移动的南北苏门答腊岛的年度周期。关于（iv）还尝试了数值计算来模拟云的生成和移动的日循环，这些结果在国际会议和期刊上发表，并总结在一本报告小册子中。