Changing monsoon and midlatitude circulation interactions over the Western Himalayas and possible links to occurrences of extreme precipitation

被引：0
作者：
P. Priya
R. Krishnan
Milind Mujumdar
Robert A. Houze
机构：
[1] Indian Institute of Tropical Meteorology,Centre for Climate Change Research
[2] Savitribai Phule Pune University,Department of Atmospheric and Space Science
[3] University of Washington,undefined
[4] Pacific Northwest National Laboratory,undefined
来源：
Climate Dynamics | 2017年 / 49卷
关键词：
Extreme precipitation events; Western Himalayas; Indus basin; Changes in background climatology;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Historical rainfall records reveal that the frequency and intensity of extreme precipitation events, during the summer monsoon (June–September) season, have significantly risen over the Western Himalayas (WH) and adjoining upper Indus basin since 1950s. Using multiple datasets, the present study investigates the possible coincidences between an increasing trend of precipitation extremes over WH and changes in background flow climatology. The present findings suggest that the combined effects of a weakened southwest monsoon circulation, increased activity of transient upper-air westerly troughs over the WH region, enhanced moisture supply by southerly winds from the Arabian Sea into the Indus basin have likely provided favorable conditions for an increased frequency of certain types of extreme precipitation events over the WH region in recent decades.
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页码：2351 / 2364
页数：13
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