气候变化领域集成服务门户(CCPortal): Sea-Ice Melt Driven by Ice-Ocean Stresses on the Mesoscale

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DOI	10.1029/2020JC016404
	Sea-Ice Melt Driven by Ice-Ocean Stresses on the Mesoscale
	Gupta M.; Marshall J.; Song H.; Campin J.-M.; Meneghello G.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	The seasonal ice zone around both the Arctic and the Antarctic coasts is typically characterized by warm and salty waters underlying a cold and fresh layer that insulates sea-ice floating at the surface from vertical heat fluxes. Here, we explore how a mesoscale eddy field rubbing against ice at the surface can, through Ekman-induced vertical motion, bring warm waters up to the surface and partially melt the ice. We dub this the “Eddy-Ice-Pumping” (EIP) mechanism. When sea-ice is relatively motionless, underlying mesoscale eddies experience a surface drag that generates Ekman upwelling in anticyclones and downwelling in cyclones. An eddy composite analysis of a Southern Ocean eddying channel model, capturing the interaction of the mesoscale with sea-ice, shows that within the compact ice zone, the mixed layer depth (MLD) is shallow in anticyclones (∼20 m) due to sea-ice melt and deep in cyclones (∼50–200m) due to brine rejection. “EIP” warms the core of anticyclones without significantly affecting the temperature of cyclones, producing a net upward vertical heat flux that reduces the mean sea-ice thickness by 10% and shoals the MLD by 60% over the course of winter and spring. In the following months, the sea-ice thickness recovers with an overshoot, due to strong negative feedbacks associated with atmospheric cooling and salt stratification. Consequently, the effect of “EIP” does not accumulate over the years, but modulates the seasonal cycle of ice within the compact ice zone. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Antarctica; drag; mesoscale; ocean; sea-ice
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186604
作者单位	Department of Earth, Atmosphere and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
推荐引用方式 GB/T 7714	Gupta M.,Marshall J.,Song H.,et al. Sea-Ice Melt Driven by Ice-Ocean Stresses on the Mesoscale[J],2020,125(11).
APA	Gupta M.,Marshall J.,Song H.,Campin J.-M.,&Meneghello G..(2020).Sea-Ice Melt Driven by Ice-Ocean Stresses on the Mesoscale.Journal of Geophysical Research: Oceans,125(11).
MLA	Gupta M.,et al."Sea-Ice Melt Driven by Ice-Ocean Stresses on the Mesoscale".Journal of Geophysical Research: Oceans 125.11(2020).