气候变化领域集成服务门户(CCPortal): Asymmetric impact of East Asian jet’s variation on midsummer rainfall in North China and Yangtze River Valley

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DOI	10.1007/s00382-019-04923-w
	Asymmetric impact of East Asian jet’s variation on midsummer rainfall in North China and Yangtze River Valley
	Wang S.; Zuo H.; Yin Y.; Wang J.; Ma X.
发表日期	2019
ISSN	0930-7575
起始页码	6199
结束页码	6213
卷号	53 期号:2020-09-10
英文摘要	Variations of East Asian subtropical westerly jet (EAWJ) have a close relationship with the midsummer rainfall anomalies in Yangtze River Valley (YRV) and North China (NC). The present study shows that the relationship is asymmetric. When EAWJ is located north (south) of its median position for 1979–2013, EAWJ’s southward displacement is associated with the increased (decreased) rainfall anomalies in NC and no obvious (increased) rainfall anomalies in YRV; and vice versa. The mechanism is as follows. EAWJ’s southward displacement is associated with northward flow anomalies over NC and YRV, when EAWJ is located north of the median position. The associated moisture convergence and warm advection anomalies over NC cause increased rainfall anomalies in NC, while rainfall anomalies in YRV are weak due to the weak thermal advection and water vapor convergence/divergence anomalies. When EAWJ is located south of the median position, anomalous southwestward and eastward flow are observed over NC and YRV, respectively, associated with EAWJ’s southward displacement. The resultant cold advection anomalies over NC cause decreased rainfall anomalies in NC, while the resultant anomalous warm advection and moisture convergence over YRV cause positive rainfall anomalies in YRV. The asymmetric circulation changes responsible for the asymmetric rainfall changes in YRV&NC are quasi-barotropic, implying that EAWJ is among the large-scale environmental forcings for the asymmetric rainfall variability in NC&YRV. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Asymmetric relationship; Dynamic mechanism; East Asian westerly jet; Midsummer rainfall; North China; Yangtze River Valley
语种	英语
scopus关键词	advection; asymmetry; atmospheric dynamics; atmospheric moisture; jet; rainfall; spatial variation; westerly; China; Yangtze Valley
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145857
作者单位	School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China; College of Atmospheric Sciences, Lanzhou UniversityGansu Province, China; Climate and Weather Disasters Collaborative Innovation Center, Nanjing University of Information Science and Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Wang S.,Zuo H.,Yin Y.,等. Asymmetric impact of East Asian jet’s variation on midsummer rainfall in North China and Yangtze River Valley[J],2019,53(2020-09-10).
APA	Wang S.,Zuo H.,Yin Y.,Wang J.,&Ma X..(2019).Asymmetric impact of East Asian jet’s variation on midsummer rainfall in North China and Yangtze River Valley.Climate Dynamics,53(2020-09-10).
MLA	Wang S.,et al."Asymmetric impact of East Asian jet’s variation on midsummer rainfall in North China and Yangtze River Valley".Climate Dynamics 53.2020-09-10(2019).