气候变化领域集成服务门户(CCPortal): Links Between Barents-Kara Sea Ice and the Extratropical Atmospheric Circulation Explained by Internal Variability and Tropical Forcing

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DOI	10.1029/2019GL085679
	Links Between Barents-Kara Sea Ice and the Extratropical Atmospheric Circulation Explained by Internal Variability and Tropical Forcing
	Warner J.L.; Screen J.A.; Scaife A.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	Changes in Arctic sea ice have been proposed to affect midlatitude winter atmospheric circulation, often based on observed coincident variability. However, causality of this covariability remains unclear. Here, we address this issue using atmospheric model experiments prescribed with observed sea surface temperature variations and either constant or time-varying sea ice variability. We show that the observed relationship between late-autumn Barents-Kara sea ice and the winter North Atlantic Oscillation can be reproduced by simulated atmospheric internal variability but is not simulated as a forced response to sea ice. Observations and models suggest reduced sea ice is linked to a weaker Aleutian Low. We show that simulated Aleutian Low variability is correlated with observed sea ice variability even in simulations with fixed sea ice, implying that this relationship is not incidental. Instead, we suggest that covariability between sea ice and the Aleutian Low originates from tropical sea surface temperature and rainfall variations and their teleconnections to the extratropics. © 2019. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric pressure; Atmospheric temperature; Climatology; Oceanography; Submarine geophysics; Surface properties; Surface waters; Tropics; AMIP; Atmospheric circulation; Atmospheric model; Internal variability; Rainfall variation; Sea surface temperature (SST); Teleconnections; Winter North Atlantic Oscillation; Sea ice; air-sea interaction; atmospheric circulation; atmospheric forcing; climate variation; experimental study; North Atlantic Oscillation; observational method; sea ice; sea surface temperature; teleconnection; winter; Arctic Ocean; Barents Sea; Kara Sea
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170845
作者单位	College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Met Office Hadley Centre, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Warner J.L.,Screen J.A.,Scaife A.A.. Links Between Barents-Kara Sea Ice and the Extratropical Atmospheric Circulation Explained by Internal Variability and Tropical Forcing[J],2020,47(1).
APA	Warner J.L.,Screen J.A.,&Scaife A.A..(2020).Links Between Barents-Kara Sea Ice and the Extratropical Atmospheric Circulation Explained by Internal Variability and Tropical Forcing.Geophysical Research Letters,47(1).
MLA	Warner J.L.,et al."Links Between Barents-Kara Sea Ice and the Extratropical Atmospheric Circulation Explained by Internal Variability and Tropical Forcing".Geophysical Research Letters 47.1(2020).