气候变化领域集成服务门户(CCPortal): Changes in large-scale circulation over the Indo-Pacific region and its association with 2018 Kerala extreme rainfall event

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DOI	10.1016/j.atmosres.2021.105809
	Changes in large-scale circulation over the Indo-Pacific region and its association with 2018 Kerala extreme rainfall event
	Chaluvadi R.; Varikoden H.; Mujumdar M.; Ingle S.T.; Kuttippurath J.
发表日期	2021
ISSN	0169-8095
卷号	263
英文摘要	We investigate the characteristics and causes of extreme rainfall event occurred in Kerala (south western regions of the peninsular India) in August 2018. The changes in large-scale circulations over the Indo-Pacific domain and their association with regional circulation features, which made the extreme rainfall in Kerala are analysed. During this extreme event, Kerala experienced eleven days of incessant rainfall from 8 to 18 August 2018. It is observed that these extreme rainfall days were accompanied with two extreme spells of rainfall during 8–10 and 14–17 August 2018 that made severe floods in Kerala. Kerala experienced rainfall of more than 100 mm day−1, particularly in the south Kerala during these events. The triad (average of three days) analysis of vertical velocity at 500 hPa and moisture convergence at the surface level reveal the dynamics and thermal structure of the regional deep convective activity. A remarkable eastward shift of cross equatorial flow over the Indian Ocean produced an intense offshore vortex, which induced more moisture towards the southern regions especially over Kerala where the extreme event was occurred. The west Pacific subtropical high (WPSH) is one of the large-scale circulations over the Indo-Pacific region, which shifted northward and the western flank of WPSH extended westward resulting a blocking high that was created over East Asia during the period. The eastward shift of cross-equatorial flow over the Bay of Bengal, outflow from the East Asian blocking high were mainly maintaining the low-pressure system over the Bay of Bengal during the extreme event. Therefore, the key cause of the extreme flood over Kerala in August 2018 is the deep moisture convergence through the offshore vortex, intense intrusion from subtropics and out flow from low-pressure system over the Bay of Bengal. © 2021 Elsevier B.V.
英文关键词	Extreme rainfall event; Moisture convergence; Offshore vortex; Regional features; West pacific subtropical high
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236603
作者单位	Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pashan, Pune, 411008, India; Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, 425001, India; CORAL, Indian Institute of Technology Kharagpur, India
推荐引用方式 GB/T 7714	Chaluvadi R.,Varikoden H.,Mujumdar M.,et al. Changes in large-scale circulation over the Indo-Pacific region and its association with 2018 Kerala extreme rainfall event[J],2021,263.
APA	Chaluvadi R.,Varikoden H.,Mujumdar M.,Ingle S.T.,&Kuttippurath J..(2021).Changes in large-scale circulation over the Indo-Pacific region and its association with 2018 Kerala extreme rainfall event.Atmospheric Research,263.
MLA	Chaluvadi R.,et al."Changes in large-scale circulation over the Indo-Pacific region and its association with 2018 Kerala extreme rainfall event".Atmospheric Research 263(2021).