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A study of Precipitation Mechanisms of Asian Monsoon

亚洲季风降水机制研究

基本信息

批准号：
05044060
负责人：
TAKAHASHI Tsutomu
金额：
$ 7.68万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05044060/
关键词：
Asian Winter Monsoon Rain Precipitation Mechanism of Monsoon Rain Precipitation and Convection Asian Water Circulation モンスーン雨熱帯の雨

项目摘要

The study of Asian Monsoon rain is important not only for people living in the area but also for a better understanding of global water circulation. However, because it is difficult to conduct aircraft observations due to the expected high content of supercooled water in cloud, the study of precipitation processes has been slow in progress.Our research group has developed videosonde system to study the precipitation processes. The videosonde is a balloon-borne videosonde system from which images of precipitation particles > 0.5 mm in diameter are acquired by a video camera using two sources of stroboscopic illumination.In our observations in Thailand, thirteen videosondes were launched in Songkhla (7*N,101*E)during the period from November 4 to 25,1993, and fourteen videosondes were launched in Surat Thani (9*N,99*E)during the period from October 23 to November 20,1994. In the latter case, videosondes were launched in close collaboration with the C-band doppler radar which belongs to Thai Meteorological Agency.Highlights of the research are :1. There are two types of rain system : One is the equatorial rain system approached from lower latitude, and the second is the monsoon rain system which developed under intence high pressure over the continent extending over the Indo-China Peninsula.2. Different precipitation processes is found in each rain system. In the equatorial rain system, warm rain process dominates, while upper-level graupel formation process as well as low-level warm rain process is active in the monsoon rain system.3. According to the doppler radar analysis, the monsoon rain system is characterized by additional upper-level lifting.4. Larger raindrops are produced in the monsoon rain system than in the equatorial rain system probably because of the strong interaction between graupel falling from above and raindrops grown by warm rain process.

研究亚洲季风雨不仅对生活在该地区的人们很重要，而且对更好地了解全球水循环也很重要。然而，由于云中过冷水含量较高，飞机观测困难，降水过程的研究进展缓慢，本课题组开发了视频探空系统，对降水过程进行了研究。视频探空仪是一个气球携带的视频探空仪系统，通过使用两个频闪照明源的视频摄像机获取直径> 0.5 mm的降水颗粒的图像。1994年10月23日至11月20日在苏拉塔尼（9*N，99*E）发射了14个视频探空仪。在后一种情况下，电视探空仪是与属于泰国气象局的C波段多普勒雷达密切合作发射的。降水系统有两种类型：一种是从低纬接近的赤道降水系统，另一种是在中南半岛大陆上的强高压作用下发展起来的季风降水系统.不同的降水过程在不同的雨系统。在赤道雨系统中，暖雨过程占主导地位，而在季风雨系统中，高空生成过程和低层暖雨过程都很活跃.根据多普勒雷达分析，季风雨系统具有附加的高层抬升的特征。季风雨系统产生的雨滴比赤道雨系统大，这可能是由于暖雨过程产生的雨滴与从高空落下的<$球有较强的相互作用。