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

这项研究的目的是澄清的降水活动，这是印尼海洋大陆的水和能量循环的基本要素之一的分布和变化。具体而言，我们开展了以下四项研究：1）利用热带降雨测量使命任务（TRMM）卫星数据分析降雨日周期，2）根据苏门答腊岛上空密集的多点无线电探空仪观测结果检查当地环流，3）利用R/V米拉伊号观测东印度洋上空的海洋对流，（4）探讨对流活动的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）建立了一台具有大量数据存储的计算机，用于TRMM数据分析，2）在距离Sumatera岛100公里的小岛上安装了观测设备，3）上一财政年度（2001财政年度）的密集型探空仪观测数据。 ...更多信息 在第二个财政年度（2003财年），我们发现：1）周日的海陆降雨峰值迁移，向内陆推进白天（近海）区域（夜间）从苏门答腊岛的西南海岸线看，2）由局地和大尺度相互作用触发的对流沿海岸线产生沿着（西南季风）环流的日变化，以及3）对流层中低层风场的日变化也被降水峰值的迁移所显著地修正。1）阐明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）讨论了热带辐合带（ITCZ）降水峰迁移的季节变化;（3）利用区域气候模式对海洋、岛屿和陆地上移动对流的调制机制进行了进一步的研究。少

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