气候变化领域集成服务门户(CCPortal): Rapid Cooling and Increased Storminess Triggered by Freshwater in the North Atlantic

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DOI	10.1029/2020GL087207
	Rapid Cooling and Increased Storminess Triggered by Freshwater in the North Atlantic
	Oltmanns M.; Karstensen J.; Moore G.W.K.; Josey S.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Recent winters have been unique due to the rapid and extreme cooling of the subpolar North Atlantic. Here, we present a novel view on its causes and consequences. Combining in-situ observations with remote sensing and atmospheric reanalysis data, we show that increased freshening of the subpolar region gives rise to a faster surface cooling in fall and winter. Large freshwater events, in particular, result in pronounced cold anomalies with sharp temperature gradients that promote an enhanced storminess. The storms reinforce the cooling by driving stronger heat losses and modulating the surface flow. Consistent with this mechanism, past freshwater events have been followed by cold anomalies in winter of approximately −2°C and increases in the North Atlantic Oscillation index of up to ∼0.6 within 3 years. We expect that future freshwater discharges into the North Atlantic will amplify the cold anomaly and trigger an enhanced wintertime storminess with far-reaching climatic implications. ©2020. The Authors.
英文关键词	Atmospheric pressure; Oceanography; Remote sensing; Water; Atmospheric reanalysis data; Freshwater discharge; In-situ observations; North Atlantic; North atlantic oscillation indices; Rapid cooling; Subpolar North Atlantic; Surface cooling; Storms; cooling; estuarine front; North Atlantic Oscillation; seasonal variation; storm; temperature gradient; Atlantic Ocean (North)
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/170101
作者单位	National Oceanography Centre, Southampton, United Kingdom; GEOMAR—Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Physics, University of Toronto, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Oltmanns M.,Karstensen J.,Moore G.W.K.,et al. Rapid Cooling and Increased Storminess Triggered by Freshwater in the North Atlantic[J],2020,47(14).
APA	Oltmanns M.,Karstensen J.,Moore G.W.K.,&Josey S.A..(2020).Rapid Cooling and Increased Storminess Triggered by Freshwater in the North Atlantic.Geophysical Research Letters,47(14).
MLA	Oltmanns M.,et al."Rapid Cooling and Increased Storminess Triggered by Freshwater in the North Atlantic".Geophysical Research Letters 47.14(2020).