气候变化领域集成服务门户(CCPortal): Effect of circulation variation associated with East Asian jet on spring rainfall over North China and Yangtze-Huaihe River Valley

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DOI	10.1016/j.atmosres.2021.105611
	Effect of circulation variation associated with East Asian jet on spring rainfall over North China and Yangtze-Huaihe River Valley
	Wang S.; Hou Y.; Zhou S.; Zuo H.; Sun F.; Luo J.-J.
发表日期	2021
ISSN	0169-8095
卷号	258
英文摘要	The present study investigates the association of East Asian westerly jet (EAWJ) variations with spring rainfall anomalies in Northern China and Yangtze-Huaihe River Valley (NC-YHV) and the dynamics using reanalysis datasets. Based on the climatology and interannual variation in 200-hPa zonal winds, the index EAWJI is defined as the average 200-hPa zonal wind velocity over a zonal 10-degree-width belt centered around the seasonal-mean jet axis between 105°E and 145°E. Associated with anomalously strengthened EAWJ, significant negative rainfall anomalies are observed over NC-YHV. The dynamics are as follows. When the EAWJ is anomalously intensified, a quasi-barotropic Pacific-Japan-like (PJ) teleconnection along coastal China and an associated anomalous westerly flow over NC-YHV are observed. In middle-lower troposphere, Tibetan Plateau (TP) drastically reduces the anomalous southwesterly momentum transported into NC-YHV, turning the westerly anomalies into northwesterly anomalies. The anomalous northwesterly winds over NC-YHV advect cold and dry air southeastward toward NC-YHV, which induce downward motion (diabatic heating feedback is weak) and negative moisture anomalies, respectively, and thus cause reduced rainfall anomalies over NC-YHV. Anomalous winter SSTAs in western Pacific and tropical Indian Ocean associated with ENSO are sustained until spring, inducing barotropic waves that propagate northwards to cause EAWJ-associated circulation anomalies and thus bring about spring rainfall anomalies in NC-YHV. The quasi-barotropic features of the EAWJ-associated circulation anomalies and their association with the northward propagation of tropical SSTA-induced barotropic waves together suggest that EAWJ-associated circulation variations are at least partly among the external forcings responsible for spring rainfall anomalies in NC-YHV. © 2021 Elsevier B.V.
英文关键词	Barotropic quasi-stationary waves; Blocking effect of the Tibetan Plateau; East Asian westerly jet; External forcings; Spring rainfall in northern China and Yangtze-Huaihe River Valley; Tropical SSTA
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236719
作者单位	School of Hydrology and Water Resources, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Institute for Climate and Application Research (ICAR), Nanjing University of Information Science and Technology, Nanjing, 210044, China; College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; School of Business, Nanjing University of Information Science & Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Wang S.,Hou Y.,Zhou S.,et al. Effect of circulation variation associated with East Asian jet on spring rainfall over North China and Yangtze-Huaihe River Valley[J],2021,258.
APA	Wang S.,Hou Y.,Zhou S.,Zuo H.,Sun F.,&Luo J.-J..(2021).Effect of circulation variation associated with East Asian jet on spring rainfall over North China and Yangtze-Huaihe River Valley.Atmospheric Research,258.
MLA	Wang S.,et al."Effect of circulation variation associated with East Asian jet on spring rainfall over North China and Yangtze-Huaihe River Valley".Atmospheric Research 258(2021).