气候变化领域集成服务门户(CCPortal): Large-Scale Extreme Rainfall-Producing Synoptic Systems of the Indian Summer Monsoon

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DOI	10.1029/2020GL088403
	Large-Scale Extreme Rainfall-Producing Synoptic Systems of the Indian Summer Monsoon
	Nikumbh A.C.; Chakraborty A.; Bhat G.S.; Frierson D.M.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	In recent years India has been increasingly experiencing widespread floods induced by large-scale extreme rainfall events (LEREs). LEREs are mainly associated with monsoon low-pressure systems (LPS). The forecast of these high-flood-potential events, however, has remained challenging. Here, we compare LPSs of the summer monsoon that led to LEREs (LPS-Lg) and strong LPSs that did not result in LEREs (LPS-noLg) over central India for the period 1979–2012. We show that having a strong LPS is not a sufficient condition to produce LEREs, and the LPS-Lgs are accompanied by secondary cyclonic vortices (SCVs). The simultaneous existence of an LPS and an SCV creates a giant midtropospheric vortex. SCVs enhance dynamic lifting, static instability, and moisture transport from the Arabian Sea that precondition the atmosphere for deep convection. SCVs also slow down the propagation of LPSs. We show that the interaction of synoptic-scale systems can lead to LEREs even if individual systems are not strong enough. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric thermodynamics; Floods; Rain; Vortex flow; Cyclonic vortices; Indian summer monsoon; Individual systems; Low pressure systems; Moisture transport; Static instability; Synoptic systems; Synoptic-scale systems; Flood control; convection; extreme event; low pressure system; monsoon; precipitation intensity; summer; Arabian Sea; India; Indian Ocean; Strawberry crinkle virus
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170289
作者单位	Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, India; Divecha Centre for Climate Change, Indian Institute of Science, Bangalore, India; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Nikumbh A.C.,Chakraborty A.,Bhat G.S.,et al. Large-Scale Extreme Rainfall-Producing Synoptic Systems of the Indian Summer Monsoon[J],2020,47(11).
APA	Nikumbh A.C.,Chakraborty A.,Bhat G.S.,&Frierson D.M.W..(2020).Large-Scale Extreme Rainfall-Producing Synoptic Systems of the Indian Summer Monsoon.Geophysical Research Letters,47(11).
MLA	Nikumbh A.C.,et al."Large-Scale Extreme Rainfall-Producing Synoptic Systems of the Indian Summer Monsoon".Geophysical Research Letters 47.11(2020).