气候变化领域集成服务门户(CCPortal): Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley

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DOI	10.3354/cr01542
	Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley
	Liu L.; Zhou T.; Ning L.; Liu J.; Yan M.; Jin C.; Sun W.
发表日期	2019
ISSN	0936-577X
起始页码	237
结束页码	247
卷号	78 期号:3
英文摘要	The Arctic Oscillation (AO) is commonly recognized as a dominant large-scale mode influencing climate over the Northern Hemisphere. Here, the influences of May AO on summer (JJA) extreme precipitation events and summer extreme warm days over the middle reaches of Yangtze River Valley for the period 1961−2014 are investigated. Following a positive May AO, there are usually fewer summer extreme precipitation events but more summer extreme warm days over the middle reaches of Yangtze River Valley. Composite analyses show that positive May AO induces the northward displacement of the East Asian jet stream and northeastward displacement of the western Pacific subtropical high (WPSH), and causes a stronger, more northwestern subtropical northwest Pacific cyclone/anticyclone anomaly, as well as an anticyclonic circulation anomaly on the north side of the South China Sea, resulting in a northward shift of the rainfall belt and an enhancement of the East Asia summer monsoon. Therefore, the cumulative distribution probability of daily precipitation values shift significantly to a lower precipitation value, indicating lower probabilities of summer extreme precipitation events following positive May AO. A weakening of WPSH induces an anomalous sinking motion over the middle reaches of the Yangtze River Valley. The 850 hPa wind field shows southerly wind anomalies over the Jiang-Huai River Basin, which cause a decrease in total cloud cover, resulting in an increase in solar radiation flux. A significant shift of the daily maximum temperature probability distribution towards to higher values indicates higher probabilities of summer extreme warm day occurrences following positive May AO. This study will provide useful insights to help improve the understanding of the dynamics and projections of future regional extreme precipitation changes over the middle reaches of Yangtze River Valley. © The authors 2019.
英文关键词	AO; Summer extreme precipitation events; Summer extreme warm days
语种	英语
scopus关键词	air-sea interaction; anticyclone; Arctic Oscillation; cloud cover; cyclone; extreme event; high temperature; jet stream; Northern Hemisphere; precipitation (climatology); solar radiation; subtropical convergence; summer; wind field; China; Huai River; Pacific Ocean; South China Sea; Yangtze River
来源期刊	Climate Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146928
作者单位	Key Laboratory for Virtual Geographic Environment, Ministry of Education, Nanjing, 210023, China; State Key Laboratory Cultivation Base of Geographical Environment Evolution of Jiangsu Province, Nanjing, 210023, China; School of Geography, Nanjing Normal University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China; Open Studio for the Simulation of Ocean-Climate-Isotope, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Climate System Research Center, Department of Geosciences, University of Massachusetts, Amherst, 01003, United States; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Beijing, 100000, China
推荐引用方式 GB/T 7714	Liu L.,Zhou T.,Ning L.,et al. Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley[J],2019,78(3).
APA	Liu L..,Zhou T..,Ning L..,Liu J..,Yan M..,...&Sun W..(2019).Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley.Climate Research,78(3).
MLA	Liu L.,et al."Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley".Climate Research 78.3(2019).