干旱区生态环境知识资源中心(Arid): Dynamics of rainfall extremes over India: A new perspective

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DOI	10.1002/joc.6516
	Dynamics of rainfall extremes over India: A new perspective
	Sooraj, K. P.1; Terray, Pascal 2; Shilin, Anokha 1,3; Mujumdar, Milind 1
通讯作者	Sooraj, K. P.
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN	0899-8418
EISSN	1097-0088
出版年	2020
卷号	40 期号:12 页码:5223-5245
英文摘要	A comprehensive analysis of the role of Indo-Pakistan arid region (IPAR) in modulating the boreal summer heavy extreme rainfall events over monsoon core zone (MCZ over Indian subcontinent) at subseasonal to daily time scales is presented. The objective is to bring new perspectives on the dynamics of such rainfall extremes. Time-lagged composite analysis shows the clustering of Monsoon Intra-Seasonal Oscillation with monsoon rainfall daily extremes. However, our results additionally bring out the distinct role of surface thermal forcing and moist processes over IPAR as another potential and significant precursor, 16-10 days in advance, causing monsoon rainfall daily extremes over MCZ. Further analysis reveals that the warming over IPAR is initially found in the northern part of the domain, 20-15 days before the rainfall events over MCZ and is triggered by subtropical-midlatitude interactions characterized by the intrusion of a midlatitude (i.e., Eurasian) atmospheric wave train into the Asian domain. Our analysis further reveals strong moist static energy (MSE) build-up over the IPAR 12 days in advance, which is initially dominated by anomalous warming in the lower atmosphere, but with an incremental contribution of low-level specific humidity as we moved forward in time towards the rainfall event. Hydrodynamic-longwave radiative teleconnections are the primary mechanism for the persistence of the surface warming and MSE buildup over IPAR after the initial intrusion of the Eurasian wave train. The persistent warming over IPAR reinforces the land-sea contrast between the Middle East and western equatorial Indian Ocean to its south, and this subsequently leads to pressure anomalies and monsoon circulation changes through geostrophic wind adjustment, thus enhancing westerlies over Arabian Sea. All these factors lead to the development of a gigantic monsoon trough over central India thus causing the rainfall extremes over MCZ through the genesis of synoptic vortices.
英文关键词	Eurasian wave train hydrodynamic-radiative teleconnection monsoon core zone subtropical-midlatitude interaction summer monsoon rainfall extremes west Asian arid regions
类型	Article
语种	英语
国家	India ; France
收录类别	SCI-E
WOS记录号	WOS:000517395400001
WOS关键词	MONSOON INTRASEASONAL OSCILLATIONS ; ASIAN SUMMER MONSOON ; EXTENDED RANGE PREDICTION ; SEA-SURFACE TEMPERATURE ; ARABIAN HEAT LOW ; INTERANNUAL VARIABILITY ; PROPAGATION CHARACTERISTICS ; INCREASING TREND ; OCEAN ; PREDICTABILITY
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314748
作者单位	1.Indian Inst Trop Meteorol, Ctr Climate Change Res, Pune 411008, Maharashtra, India; 2.Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,LOCEAN Lab, Paris, France; 3.Indian Inst Technol, Interdisciplinary Programme Climate Studies, Mumbai, Maharashtra, India
推荐引用方式 GB/T 7714	Sooraj, K. P.,Terray, Pascal,Shilin, Anokha,et al. Dynamics of rainfall extremes over India: A new perspective[J]. French National Research Institute for Sustainable Development,2020,40(12):5223-5245.
APA	Sooraj, K. P.,Terray, Pascal,Shilin, Anokha,&Mujumdar, Milind.(2020).Dynamics of rainfall extremes over India: A new perspective.INTERNATIONAL JOURNAL OF CLIMATOLOGY,40(12),5223-5245.
MLA	Sooraj, K. P.,et al."Dynamics of rainfall extremes over India: A new perspective".INTERNATIONAL JOURNAL OF CLIMATOLOGY 40.12(2020):5223-5245.