气候变化领域集成服务门户(CCPortal): Atmospheric blocking events in the North Atlantic: trends and links to climate anomalies and teleconnections

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DOI	10.1007/s00382-020-05583-x
	Atmospheric blocking events in the North Atlantic: trends and links to climate anomalies and teleconnections
	Wazneh H.; Gachon P.; Laprise R.; de Vernal A.; Tremblay B.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-07-08
英文摘要	Atmospheric blockings are generally associated with large-scale high-pressure systems that interrupt west-to-east atmospheric flow in mid and high latitudes. Blockings cause several days of quasi-stationary weather conditions, and therefore can result in monthly or seasonal climate anomalies and extreme weather events on the affected regions. In this paper, the long-term coupled CERA-20C reanalysis data from 1901 to 2010 are used to evaluate the links between blocking events over the North Atlantic north of 35° N, and atmospheric and oceanic modes of climate variability on decadal time scales. This study indicates more frequent and longer lasting blocking events than previous studies using other reanalyses products. A strong relationship was found between North Atlantic blocking events and North Atlantic Oscillation (NAO), Atlantic Multidecadal Oscillation (AMO) and Baffin Island–West Atlantic (BWA) indices, in fall, winter and spring. More blocking events occur during the negative phases of the NAO index and positive phases of the BWA mode. In some situations, the BWA patterns provide clearer links with the North Atlantic blocking occurrence than with the NAO alone. The correlation between the synchronous occurrences of AMO and blocking is generally weak, although it does increase for a lag of about 6–10 years. Convergent cross mapping (CCM) furthermore demonstrates a significant two-way causal effect between blocking occurrences and the NAO and BWA indices. Finally, while we find no significant trends in blocking frequencies over the last 110 years in the Northern Hemisphere, these events become longer lasting in summer and fall, and more intense in spring in the North Atlantic. © 2021, The Author(s).
英文关键词	Atmospheric blocking; Climate variables; Convergent cross mapping; North Atlantic; Northern hemisphere; Teleconnection indices
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/183337
作者单位	Department of Geography, University of Québec at Montréal (UQAM), Québec, Canada; Department of Earth and Atmospheric Sciences, University of Québec at Montréal (UQAM), Québec, Canada; ESCER (Étude et Simulation du Climat à l’Échelle Régionale) Centre, University of Québec at Montréal (UQAM), Québec, Canada; Department of Atmospheric and Oceanic Sciences, McGill University, Québec, Canada
推荐引用方式 GB/T 7714	Wazneh H.,Gachon P.,Laprise R.,et al. Atmospheric blocking events in the North Atlantic: trends and links to climate anomalies and teleconnections[J],2021,56(2021-07-08).
APA	Wazneh H.,Gachon P.,Laprise R.,de Vernal A.,&Tremblay B..(2021).Atmospheric blocking events in the North Atlantic: trends and links to climate anomalies and teleconnections.Climate Dynamics,56(2021-07-08).
MLA	Wazneh H.,et al."Atmospheric blocking events in the North Atlantic: trends and links to climate anomalies and teleconnections".Climate Dynamics 56.2021-07-08(2021).