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Comparisons of sea ice motion and deformation, and their responses to ice conditions and cyclonic activity in the western Arctic Ocean between two summers

Citation

Lei, R and Gui, D and Heil, P and Hutchings, JK and Ding, M, Comparisons of sea ice motion and deformation, and their responses to ice conditions and cyclonic activity in the western Arctic Ocean between two summers, Cold Regions Science and Technology, 170 Article 102925. ISSN 0165-232X (2019) [Refereed Article]

Copyright Statement

©2019 Published by Elsevier B.V.

DOI: doi:10.1016/j.coldregions.2019.102925

Abstract

Measurements from 30 and 31 ice drifters during the seasonal transition from mid-August to late September of 2014 and 2016, respectively, were used to characterize sea ice motion and deformation in the western Arctic Ocean. The dispersion distance for the ice deformation in summer was markedly reduced because the mechanical behavior of sea ice in summer is closer to free drift and more granular compared to that in winter. For unconsolidated sea ice in late summer the logarithmic relationship between deformation and spatial scale is 2.4–3.1 times that for ice under freezing conditions. For 2007 to 2016 late summer (August – September) sea ice compactness in the Arctic was the highest (lowest) in 2014 (2016). Along the trajectories of the 2016 (2014) ice camp, the average 10-m wind speed in August–September was larger (smaller) than that averaged in 1979–2016 by 20% (13%). Relative to the great Arctic cyclone in August 2012, cyclones in summer 2016 had comparable sizes and intensity but with longer persistence. Lower ice compactness coupled with stronger cyclonic activity in late summer 2016 led to increased ice speed and enhanced deformation compared to 2014. Sea ice during late summer 2016 was closer to free drift, resulting in greater homogeneity of the drift field, a larger ice–wind speed ratio, as well as weaker multifractality, localization, and space–time coupling of the deformation field compared to late summer 2014. The localization of ice deformation in late summer 2014 was comparable to that obtained in the freezing season because of the high ice compactness. The enhanced ice dynamics in summer 2016 promoted ice melt and area loss via the positive albedo feedback.

Item Details

Item Type:Refereed Article
Keywords:polar sea ice, climate processes, Arctic, sea ice, cyclonic activity, ice concentration, ice deformation
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climatology (excl. Climate Change Processes)
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:137628
Year Published:2019
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2020-02-24
Last Modified:2020-04-17
Downloads:0

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