气候变化领域集成服务门户(CCPortal): Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard

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DOI	10.1029/2019JC015662
	Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard
	Duarte P.; Sundfjord A.; Meyer A.; Hudson S.R.; Spreen G.; Smedsrud L.H.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Warm Atlantic water (AW) that flows northward along the Svalbard west coast is thought to transport enough heat to melt regional Arctic sea ice effectively. Despite this common assumption, quantitative requirements necessary for AW to directly melt sea ice fast enough under realistic winter conditions are still poorly constrained. Here we use meteorological data, satellite observations of sea ice concentration and drift, and model output to demonstrate that most of the sea ice entering the area over the Yermak Plateau melts within a few weeks. Simulations using the Los Alamos Sea Ice Model (CICE) in a 1-D vertically resolved configuration under a relatively wide range of in situ observed atmospheric and ocean forcing show a good fit to observations. Simulations require high-frequency atmospheric forcing data to accurately reproduce vertical heat fluxes between the ice or snow and the atmosphere. Moreover, we switched off hydrostatic equilibrium to properly reproduce ice and snow thickness when observations showed that ice had a negative freeboard, without surface flooding and snow-ice formation. This modeling shows that realistic melt rates require a combination of warm near-surface AW and storm-induced ocean mixing. However, if AW is warmer than usual (>5°C), then lower mixing rates are sufficient. Our results suggest that increased winter storm frequency and increased heat content of the AW may work together in reducing future sea ice cover in the Eurasian basin. ©2020. The Authors.
英文关键词	Atlantic water; ice melting; ice-free area north of Svalbard; Los Alamos Sea Ice Model; storm frequency; Whalers Bay
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/186726
作者单位	Norwegian Polar Institute, Fram Centre, Tromsø, Norway; ARC Centre of Excellence for Climate Extremes, IMAS University of Tasmania, Hobart, TAS, Australia; Institute of Environmental Physics, University of Bremen, Bremen, Germany; Geophysical Institute, Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
推荐引用方式 GB/T 7714	Duarte P.,Sundfjord A.,Meyer A.,et al. Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard[J],2020,125(8).
APA	Duarte P.,Sundfjord A.,Meyer A.,Hudson S.R.,Spreen G.,&Smedsrud L.H..(2020).Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard.Journal of Geophysical Research: Oceans,125(8).
MLA	Duarte P.,et al."Warm Atlantic Water Explains Observed Sea Ice Melt Rates North of Svalbard".Journal of Geophysical Research: Oceans 125.8(2020).