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Annual cycles of sea ice motion and deformation derived from buoy measurements in the western Arctic Ocean over two ice seasons

Citation

Lei, R and Gui, D and Hutchings, JK and Heil, P and Li, N, Annual cycles of sea ice motion and deformation derived from buoy measurements in the western Arctic Ocean over two ice seasons, JGR Oceans, 125, (6) Article e2019JC015310. ISSN 2169-9275 (2020) [Refereed Article]


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DOI: doi:10.1029/2019JC015310

Abstract

Data collected by two buoy arrays that operated during the ice seasons of 2014/2015 and 2016/2017 were used to characterize annual cycles of ice motion and deformation in the western Arctic Ocean. An anomalously strong and weak Beaufort Gyre in 2014/2015 and 2016/2017 induced generally anticyclonic and cyclonic sea ice drift during 2014/2015 and 2016/2017, respectively. Cyclonic ice motion resulted in higher contributions of ice divergence to total ice deformation in 2016/2017 than in 2014/2015. In 2014, the autumn ice concentration and multiyear ice coverage were higher than in 2016; consequently, the response of ice motion to wind forcing was weak, and less ice deformation was observed in autumn 2014. During the autumn‐winter transition, the ice‐wind speed ratio, ice deformation rate and its spatial and temporal scaling exponents, and localization of ice deformation decreased markedly in both 2014/2015 and 2016/2017 as a result of freeze‐up and consolidation of ice floes. Such dynamic behavior was maintained through to spring with the further thickening of ice cover. Ice deformation increased due to weakened ice strength as summer approached. The amplitude of the annual cycle of ice deformation rate in the western Arctic Ocean in 2014/2015 and especially in 2016/2017 was larger than that observed during the Surface Heat Budget of the Arctic Ocean (SHEBA) program in 1997/1998. We attribute this phenomenon to ice loss during the recent summers, especially of thick multiyear ice.

Item Details

Item Type:Refereed Article
Keywords:polar sea ice, energy balance, surface mass loss
Research Division:Earth Sciences
Research Group:Other Earth Sciences
Research Field:Earth Sciences not elsewhere classified
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
UTAS Author:Heil, P (Dr Petra Heil)
ID Code:139716
Year Published:2020
Deposited By:Australian Antarctic Program Partnership
Deposited On:2020-06-29
Last Modified:2020-06-30
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