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Warm Atlantic water explains observed sea ice melt rates north of Svalbard

Citation

Duarte, P and Sundfjord, A and Meyer, A and Hudson, SR and Spreen, G and Smedsrud, LH, Warm Atlantic water explains observed sea ice melt rates north of Svalbard, Journal of Geophysical Research: Oceans, 125, (8) Article e2019JC015662. ISSN 2169-9275 (2020) [Refereed Article]


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Copyright Statement

2020. The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1029/2019JC015662

Abstract

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 (>5C), 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.

Item Details

Item Type:Refereed Article
Keywords:Arctic, sea ice, Atlantic water, storms, climate change
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Global effects of climate change (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. social impacts)
UTAS Author:Meyer, A (Dr Amelie Meyer)
ID Code:140534
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Oceans and Cryosphere
Deposited On:2020-08-26
Last Modified:2021-02-11
Downloads:6 View Download Statistics

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