气候变化领域集成服务门户(CCPortal): Impact of the Eastward Shift in the Negative-Phase NAO on Extreme Drought Over Northern China in Summer

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DOI	10.1029/2019JD032019
	Impact of the Eastward Shift in the Negative-Phase NAO on Extreme Drought Over Northern China in Summer
	Du Y.; Zhang J.; Zhao S.; Chen H.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	The frequency of extreme drought events in northern China has increased since the mid-1990s, and such a decadal anomalous trend may have a vital influence on national economics and food supply. Based on the analysis of observational datasets and experiments conducted by a linear baroclinic model, this study claims that the intraseasonal circulation anomalies related to extreme drought are linked to the eastward shift in the negative phase of the summer North Atlantic Oscillation (SNAO). When the SNAO is in a negative phase, the cyclonic eddy-driven jet can enhance the eastward extension of the North Atlantic jet stream (NAJS), contributing to a closer connection between the NAJS and the Asian-African jet stream and enhancing the waveguide. The cyclonic eddy in the exit of the jet stream excites anomalous Rossby wave energy that originates from the NAJS exit and spreads to the Caspian Sea, Mongolia, and northern China; this associated wave train, which is similar to the Silk Road Pattern (SRP), enhances the anticyclonic anomaly over northern China, establishing a pronounced link with extreme drought in northern China. Thus, the negative phase of the SNAO may be a contributing driver of extreme drought in northern China. ©2020. The Authors.
英文关键词	extreme droughts; North Atlantic jet stream; SNAO
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185847
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China
推荐引用方式 GB/T 7714	Du Y.,Zhang J.,Zhao S.,et al. Impact of the Eastward Shift in the Negative-Phase NAO on Extreme Drought Over Northern China in Summer[J],2020,125(16).
APA	Du Y.,Zhang J.,Zhao S.,&Chen H..(2020).Impact of the Eastward Shift in the Negative-Phase NAO on Extreme Drought Over Northern China in Summer.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Du Y.,et al."Impact of the Eastward Shift in the Negative-Phase NAO on Extreme Drought Over Northern China in Summer".Journal of Geophysical Research: Atmospheres 125.16(2020).