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Drift of pancake ice floes in the winter Antarctic marginal ice zone during polar cyclones
Citation
Alberello, A and Bennetts, L and Heil, P and Eayrs, C and Vichi, M and MacHutchon, K and Onorato, M and Toffoli, A, Drift of pancake ice floes in the winter Antarctic marginal ice zone during polar cyclones, JGR Oceans, 125, (3) Article e2019JC015418. ISSN 2169-9275 (2020) [Refereed Article]
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Copyright Statement
Copyright 2020 American Geophysical Union
Abstract
High temporal resolution in situ measurements of pancake ice drift are presented, from a pair of buoys deployed on floes in the Antarctic marginal ice zone during the winter sea ice expansion, over 9 days in which the region was impacted by four polar cyclones. Concomitant measurements of wave‐in‐ice activity from the buoys are used to infer that the ice remained unconsolidated, and pancake ice conditions were maintained over at least the first 7 days. Analysis of the data shows (i) the fastest reported ice drift speeds in the Southern Ocean; (ii) high correlation of drift velocities with the surface wind velocities, indicating absence of internal ice stresses >100 km from the ice edge where remotely sensed ice concentration is 100%; and (iii) presence of a strong inertial signature with a 13 hr period. A Lagrangian free drift model is developed, including a term for geostrophic currents that reproduce the 13 hr period signature in the ice motion. The calibrated model provides accurate predictions of the ice drift for up to 2 days, and the calibrated parameters provide estimates of wind and ocean drag for pancake floes under storm conditions.
Item Details
Item Type: | Refereed Article |
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Keywords: | pancake ice, Antarctic Marginal Ice Zone, wave-ice interaction, buoy |
Research Division: | Earth Sciences |
Research Group: | Other earth sciences |
Research Field: | Other earth sciences not elsewhere classified |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Understanding climate change |
Objective Field: | Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts) |
UTAS Author: | Heil, P (Dr Petra Heil) |
ID Code: | 139717 |
Year Published: | 2020 |
Web of Science® Times Cited: | 24 |
Deposited By: | CRC-Antarctic Climate & Ecosystems |
Deposited On: | 2020-06-29 |
Last Modified: | 2022-08-29 |
Downloads: | 19 View Download Statistics |
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