气候变化领域集成服务门户(CCPortal): Effect of boreal spring precipitation anomaly pattern change in the late 1990s over tropical Pacific on the atmospheric teleconnection

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DOI	10.1007/s00382-018-4149-8
	Effect of boreal spring precipitation anomaly pattern change in the late 1990s over tropical Pacific on the atmospheric teleconnection
	Guo Y.; Wen Z.; Chen R.; Li X.; Yang X.–Q.
发表日期	2019
ISSN	0930-7575
起始页码	401
结束页码	416
卷号	52 期号:2020-01-02
英文摘要	Observational evidence showed that the leading mode of precipitation variability over the tropical Pacific during boreal spring experienced a pronounced interdecadal change around the late 1990s, characterized by a precipitation pattern shift from an eastern Pacific (EP) type to a central Pacific (CP) type. The distinct impacts of such a precipitation pattern shift on the extratropical atmospheric teleconnection were examined. An apparent poleward teleconnection extending from the tropics to the North Atlantic region was observed after 1998, while, there was no significant teleconnection before 1998. To understand why only the CP–type precipitation mode is associated with a striking atmospheric teleconnection after 1998, diagnostic analyses with the Eliassen–Palm flux and Rossby wave source (RWS) based on the barotropic vorticity equation were performed. The results show that for the EP–type precipitation mode, no significant RWS anomalies appeared over the subtropical Pacific due to the opposite effect of the vortex stretching and absolute vorticity advection processes. For the CP–type precipitation mode, however, there are both significant vorticity forcing source over the subtropical CP and clear poleward–propagation of Rossby wave. The spatial distribution of the CP–type precipitation pattern tends to excite a conspicuous anomalous southerly and a well–organized negative vorticity center over the subtropical CP where both the mean absolute vorticity gradient and mean divergence flow are large, hence, the interaction between the heating–induced anomalous circulation and the basic state made the generation of Rossby waves conceivable and effective. Such corresponding teleconnection responses to the prescribed heating were also examined by using a Linear Baroclinic Model (LBM). It turned out that significant poleward teleconnection pattern is only caused by the CP–type precipitation mode, rather than by the EP–type precipitation mode. Further sensitive experiments demonstrated that the change in spring basic state before and after 1998 played a relatively minor role in exciting such a teleconnection pattern, when compared with the tropical precipitation anomaly pattern change. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Interdecadal change; Teleconnection; Tropical Pacific precipitation; Tropical–extratropical interaction
语种	英语
scopus关键词	decadal variation; precipitation (climatology); Rossby wave; spatial distribution; teleconnection; vorticity; Pacific Ocean; Pacific Ocean (Tropical)
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/146631
作者单位	Center for Monsoon and Environment Research and School of Atmospheric Sciences, Sun Yat–sen University, Guangzhou, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China; Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China; CMA–NJU Joint Laboratory for Climate Prediction Studies, School of Atmospheric Sciences, Nanjing University, Nanjing, China
推荐引用方式 GB/T 7714	Guo Y.,Wen Z.,Chen R.,et al. Effect of boreal spring precipitation anomaly pattern change in the late 1990s over tropical Pacific on the atmospheric teleconnection[J],2019,52(2020-01-02).
APA	Guo Y.,Wen Z.,Chen R.,Li X.,&Yang X.–Q..(2019).Effect of boreal spring precipitation anomaly pattern change in the late 1990s over tropical Pacific on the atmospheric teleconnection.Climate Dynamics,52(2020-01-02).
MLA	Guo Y.,et al."Effect of boreal spring precipitation anomaly pattern change in the late 1990s over tropical Pacific on the atmospheric teleconnection".Climate Dynamics 52.2020-01-02(2019).