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Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Nino?
Fang, Congxi1; Liu, Yu1,2,3; Cai, Qiufang1; Song, Huiming1
Corresponding AuthorLiu, Yu(yuliu2018@ieecas.cn)
2021-06-07
Source PublicationADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
Pages15
AbstractIn 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.
Keywordextreme rainfall Northwest Pacific anticyclone anomaly (NWPAC) Indo-western Pacific Ocean capacitor (IPOC) Tropical Indian Ocean warming trend fast-decaying El Nino
DOI10.1007/s00376-021-1009-y
WOS KeywordWESTERN NORTH PACIFIC ; EAST-ASIAN MONSOON ; SEA-SURFACE TEMPERATURE ; INDIAN-OCEAN ; ANOMALOUS ANTICYCLONE ; CLIMATE ANOMALIES ; DECAYING PHASE ; SST ANOMALIES ; ENSO ; TELECONNECTION
Indexed BySCI ; SCI
Language英语
Funding ProjectStrategic 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 Research AreaMeteorology & Atmospheric Sciences
Funding OrganizationStrategic 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
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000658677900001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/16760
Collection现代环境研究室
第四纪科学与全球变化卓越创新中心
Corresponding AuthorLiu, Yu
Affiliation1.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
Recommended Citation
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.
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