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Study on the rain structure using spaceborne rain radar

利用星载雨雷达研究雨结构

基本信息

批准号：
11440139
负责人：
NAKAMURA Kenji
金额：
$ 8.19万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Rain distribution and structure were investigated using satellite-borne rain radar. The satellite is the Tropical Rainfall Measuring Mission one (TRMM) which is equipped with the world-first spacebome rain radar. Using the radar data we found :( 1 ) shallow precipitation system commonly appears over vast ocean. Over the Pacific Ocean, the height is high for west part and low for east part. Over the land, the shallow precipitation system is not significant.( 2 ) Diurnal variation of rain is significant for tropical regions where the land-ocean contrast is strong, especially, around the maritime continent.( 3 ) In the Asian monsoon season, weak but persistent rain appears around the west side of the Indochina Peninsula, and high and strong rain systems appear over the central and east side of the peninsula.( 4 ) High precipitation system with a downward decreasing rain profile likely appear in the transition region of wet and dry regions over India. Similar characteristics appears over Afiica.Another objective is the study to the atmospheric structure over India which is the key region for the Asian monsoon. We performed radiosonde observation in the south of India in August and September 2000. Lower atmosphere wind profiler (WP) data were also analyzed. From WP data, distinct diurnal variation of the planetary boundary layer was detected. The sonde data also showed the diurnal variation of the planetary boundary layer. They also showed that the planetary boundary layer is high compared with that in Japan.

利用星载雨量雷达对雨量分布和结构进行了研究。这颗卫星是热带降雨测量任务一号(TRMM)，它配备了世界上第一个星载降雨雷达。利用雷达资料发现：(1)辽阔海域普遍存在浅层降水系统。在太平洋上空，海平面呈西高东低的变化趋势。在陆地上，浅层降水系统不明显。(2)在陆地-海洋对比强烈的热带地区，特别是在海洋大陆周围，降水的日变化显著。(3)亚洲季风季，中南半岛西侧出现弱而持久的降水，半岛中部和东部出现高强降水系统。(4)印度上空干湿过渡区可能出现降水高值系统，降水廓线下移。另一个目标是研究印度上空的大气结构，印度是亚洲季风的关键区。我们于2000年8月和9月在印度南部进行了无线电探空观测。对低层风廓线(WP)资料进行了分析。从WP资料中可以检测到行星边界层明显的日变化。探空仪数据还显示了行星边界层的日变化。它们还表明，与日本相比，行星边界层是高的。