Dominant synoptic disturbance in the extreme rainfall at Cherrapunji, northeast India, based on 104 years of rainfall data (1902-2005)

F. Murata, T. Terao, H. Fujinami, Taiichi Hayashi, Haruhisa Asada, J. Matsumoto, H. Syiemlieh
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引用次数: 15

Abstract

AbstractThe characteristics of active rainfall spells (ARSs) at Cherrapunji, northeast India, where extreme high rainfall is experienced, and their relationships with large-scale dynamics were studied using daily rainfall data from 1902 to 2005 and Japanese 55-Year Reanalysis from 1958 to 2005. Extreme high daily rainfalls occur in association with ARSs. The extremely large amounts of rainfall in the monsoon season are determined by the cumulative rainfall during ARSs. ARSs start when anomalous anticyclonic circulation (AAC) at 850 hPa propagates westward from the South China Sea and western North Pacific, and covers the northern Bay of Bengal. The AAC propagates farther westward and suppresses convection over central India during ARSs at Cherrapunji, and continues for 3 to 14 days. Consequently, a northward shift of the monsoon trough during the “break” in the Indian core region occurs. The westerly wind, which prevails in the northern portion of the AAC, transports moisture toward northeast India and en...
基于104年降水资料(1902-2005)的印度东北部Cherrapunji极端降水的主导天气扰动
摘要利用1902 ~ 2005年逐日降水资料和1958 ~ 2005年日本55年再分析资料,研究了印度东北部Cherrapunji地区的活动性降雨特征及其与大尺度动力学的关系。极端高的日降雨量与ars有关。季风季节的特大降雨是由ars期间的累积降雨决定的。当850 hPa的异常反气旋环流(AAC)从南海和北太平洋西部向西传播并覆盖孟加拉湾北部时,ars开始。在Cherrapunji的ars期间,AAC进一步向西传播并抑制印度中部的对流,并持续3至14天。因此,在印度核心区的“断裂”期间,季风槽向北移动。在AAC北部盛行的西风,将水汽输送到印度东北部和印度南部。
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