Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?

doi:10.1007/s00376-021-1009-y

	Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?
	Fang, Congxi 1; Liu, Yu 1,2,3; Cai, Qiufang 1; Song, Huiming 1
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2021-06-07
页码	15
关键词	extreme rainfall Northwest Pacific anticyclone anomaly (NWPAC) Indo-western Pacific Ocean capacitor (IPOC) Tropical Indian Ocean warming trend fast-decaying El Nino
ISSN号	0256-1530
DOI	10.1007/s00376-021-1009-y
通讯作者	Liu, Yu(yuliu2018@ieecas.cn)
英文摘要	In summer 2020, extreme rainfall occurred throughout the Yangtze River basin, Huaihe River basin, and southern Yellow River basin, which are defined here as the central China (CC) region. However, only a weak central Pacific (CP) El Nino happened during winter 2019/20, so the correlations between the El Nino-Southern Oscillation (ENSO) indices and ENSO-induced circulation anomalies were insufficient to explain this extreme precipitation event. In this study, reanalysis data and numerical experiments are employed to identify and verify the primary ENSO-related factors that cause this extreme rainfall event. During summer 2020, unusually strong anomalous southwesterlies on the northwest side of an extremely strong Northwest Pacific anticyclone anomaly (NWPAC) contributed excess moisture and convective instability to the CC region, and thus, triggered extreme precipitation in this area. The tropical Indian Ocean (TIO) has warmed in recent decades, and consequently, intensified TIO basinwide warming appears after a weak El Nino, which excites an extremely strong NWPAC via the pathway of the Indo-western Pacific Ocean capacitor (IPOC) effect. Additionally, the ENSO event of 2019/20 should be treated as a fast-decaying CP El Nino rather than a general CP El Nino, so that the circulation and precipitation anomalies in summer 2020 can be better understood. Last, the increasing trend of tropospheric temperature and moisture content in the CC region after 2000 is also conducive to producing heavy precipitation.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[XDB40000000] ; CAS[QYZDJ-SSW-DQC021] ; National Natural Science Foundation of China[41630531] ; State Key Laboratory of Loess and Quaternary Geology
WOS关键词	WESTERN NORTH PACIFIC ; EAST-ASIAN MONSOON ; SEA-SURFACE TEMPERATURE ; INDIAN-OCEAN ; ANOMALOUS ANTICYCLONE ; CLIMATE ANOMALIES ; DECAYING PHASE ; SST ANOMALIES ; ENSO ; TELECONNECTION
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000658677900001
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) ; CAS ; National Natural Science Foundation of China ; State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16759]
专题	地球环境研究所_现代环境研究室第四纪科学与全球变化卓越创新中心
通讯作者	Liu, Yu
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 3.Pilot Qingdao Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao 266000, Peoples R China
推荐引用方式 GB/T 7714	Fang, Congxi,Liu, Yu,Cai, Qiufang,et al. Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2021:15.
APA	Fang, Congxi,Liu, Yu,Cai, Qiufang,&Song, Huiming.(2021).Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?.ADVANCES IN ATMOSPHERIC SCIENCES,15.
MLA	Fang, Congxi,et al."Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?".ADVANCES IN ATMOSPHERIC SCIENCES (2021):15.