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Observational Study for Precipitation Characteristic and its interaction with local circulation over Indonesian Maritime Continent

印度尼西亚海洋大陆降水特征及其与局地环流相互作用的观测研究

基本信息

批准号：
14595007
负责人：
MORI Shuichi
金额：
$ 2.43万
依托单位：
Independent Administrative Institution, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The objective of this research is to clarity the distribution and variability of precipitating activity which is one of the basic elements of the water and energy circulation over Indonesian maritime continent. In particular, we carried out the following four studies : 1)Analyze the rainfall diurnal cycle by using Tropical Rainfall Measuring Mission(TRMM) satellite data, 2)Examine local circulations based on intensive multi-points rawinsonde observations over Sumatera Island, 3)Observe maritime convections with R/V Mirai over the eastern Indian Ocean, and 4)Discuss the interaction between variations of convective activity and local circulations.In the first fiscal year (FY2002), we established the research environment as follows : 1)A computer with huge data storages was set up required for TRMM data analysis, 2)Observational equipment were installed at small island which is located 100km off Sumatera Island, and 3)Intensive rawinsonde observation data in the last fiscal year (FY2001) … More were archived for analysis.In the second fiscal year (FY2003), we found 1)diurnal land-sea rainfall peak migrations which advance towards inland (offshore) region in the daytime (nighttime) staring from the southwestern coastline of Sumatera Island, 2)convections are generated along the coastline triggered by an interaction between local and large-scale (southwesterly monsoon) circulations, and 3)diurnal wind variations in the lower to middle troposphere is modified significantly by the rainfall peak migrations, too.In the final fiscal year (FY2004), we concluded the research as follows : 1)Characteristics of convective activity over the eastern Indian Ocean were clarified for intraseasonal variation (ISV) active and inactive phases, 2)Seasonal variation of the rainfall peak migrations in relation to Inter Tropical Convergence Zone (ITCZ) were discussed, and 3)We have just started further study for mechanism of traveling convections modulated over ocean, islands, and land by using a regional climate model. Less

这项研究的目的是弄清降水活动的分布和变异性，降水活动是印度尼西亚海洋大陆水和能量循环的基本要素之一。在第一个财政年度(2002财年)，我们建立了如下研究环境：1)利用热带降雨测量任务(TRMM)卫星资料分析降水的日循环；2)在苏门答腊岛上空利用密集的多点探空仪观测局地环流；3)用R/V MIRAI观测东印度洋的海洋对流；4)讨论对流活动变化与局地环流的相互作用。在第一个财政年度(2002财年)，我们建立了如下的研究环境：1)建立了TRMM资料分析所需的计算机，2)在距苏门答腊岛100公里的小岛上安装了观测设备，3)上一财年(2001财年)密集的探空仪观测数据…在第二个财政年度(2003财年)，我们发现1)从苏门答腊岛西南海岸线开始的白天(夜间)向内陆(离岸)地区推进的日间海陆降雨峰值迁移，2)在局地和大尺度(西南季风)环流的相互作用下沿海岸线产生对流，3)对流层中下部的日变化也显著地被降雨峰值迁移所改变。在最后一个财政年度(2004财年)，1)明确了东印度洋对流活动的季节内变化(ISV)活跃期和非活跃期的特征；2)讨论了雨峰迁移与热带间辐合带(ITCZ)的季节变化；3)利用区域气候模式对海洋、岛屿和陆地上的行进对流的调制机制进行了进一步的研究。较少