气候变化领域集成服务门户(CCPortal): Historic Yangtze flooding of 2020 tied to extreme Indian Ocean conditions

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DOI	10.1073/pnas.2022255118
	Historic Yangtze flooding of 2020 tied to extreme Indian Ocean conditions
	Zhou Z.-Q.; Xie S.-P.; Zhang R.
发表日期	2021
ISSN	00278424
卷号	118 期号:12
英文摘要	Heavy monsoon rainfall ravaged a large swath of East Asia in summer 2020. Severe flooding of the Yangtze River displaced millions of residents in the midst of a historic public health crisis. This extreme rainy season was not anticipated from El Niño conditions. Using observations and model experiments, we show that the record strong Indian Ocean Dipole event in 2019 is an important contributor to the extreme Yangtze flooding of 2020. This Indian Ocean mode and a weak El Niño in the Pacific excite downwelling oceanic Rossby waves that propagate slowly westward south of the equator. At a mooring in the Southwest Indian Ocean, the thermocline deepens by a record 70 m in late 2019. The deepened thermocline helps sustain the Indian Ocean warming through the 2020 summer. The Indian Ocean warming forces an anomalous anticyclone in the lower troposphere over the Indo-Northwest Pacific region and intensifies the upper-level westerly jet over East Asia, leading to heavy summer rainfall in the Yangtze Basin. These coupled ocean-atmosphere processes beyond the equatorial Pacific provide predictability. Indeed, dynamic models initialized with observed ocean state predicted the heavy summer rainfall in the Yangtze Basin as early as April 2020. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	East Asia flooding \| anomalous anticyclone \| Indian Ocean \| El Niño
语种	英语
scopus关键词	rain; Asia; atmosphere; catchment area (hydrology); climate warming; data analysis; dynamics; flooding; human; Indian Ocean; ocean atmosphere; prediction; priority journal; public health problem; rainy season; Review; summer; thermocline; trophosphere; water flow
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180153
作者单位	Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, 200438, China; CMA-FDU JointLaboratory of Marine Meteorology, Shanghai, 200438, China; Innovation Center of Ocean and Atmosphere System, Zhuhai Fudan Innovation ResearchInstitute, Zhuhai, 518057, China; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA 92093, United States
推荐引用方式 GB/T 7714	Zhou Z.-Q.,Xie S.-P.,Zhang R.. Historic Yangtze flooding of 2020 tied to extreme Indian Ocean conditions[J],2021,118(12).
APA	Zhou Z.-Q.,Xie S.-P.,&Zhang R..(2021).Historic Yangtze flooding of 2020 tied to extreme Indian Ocean conditions.Proceedings of the National Academy of Sciences of the United States of America,118(12).
MLA	Zhou Z.-Q.,et al."Historic Yangtze flooding of 2020 tied to extreme Indian Ocean conditions".Proceedings of the National Academy of Sciences of the United States of America 118.12(2021).