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Interannual variability in sea-ice thickness in the pack-ice zone off Lutzow-Holm Bay, East Antarctica

Citation

Sugimoto, F and Tamura, T and Shimoda, H and Uto, S and Simizu, D and Tateyama, K and Hoshino, S and Ozeki, T and Fukamachi, Y and Ushio, S and Ohshima, KI, Interannual variability in sea-ice thickness in the pack-ice zone off Lutzow-Holm Bay, East Antarctica, Polar Science, 10, (1) pp. 43-51. ISSN 1873-9652 (2016) [Refereed Article]


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DOI: doi:10.1016/j.polar.2015.10.003

Abstract

Under the Japanese Antarctic Research Expedition (JARE) program, sea-ice thickness has been routinely monitored off Lützow–Holm Bay (East Antarctica) during the summer (mid-December to early January) since 2000/01, using an electromagnetic induction (EM) instrument onboard the icebreaker Shirase. Analysis of these data over a 10-year period, combined with visual observations using a simplified form of the ASPeCt (Antarctic Sea ice Processes and Climate) protocol, suggests a strong interannual variability in sea-ice thickness in this region. For the repeat pack-ice observation area, where the sea-ice thickness averaged over the nine seasons is ∼1.9 m, mean thicknesses of observed sea-ice in 2010/11 and 2011/12 are exceptionally large, at ∼3.3 and ∼5.8 m, respectively. This result is strongly related to regional patterns of sea ice dynamics. Ice convergence caused by anomalous northerly winds was particularly high in 2011/12, suggesting that the extremely thick ice observed in that season resulted largely from sea-ice deformation processes (including pressure ridging). Longer-term analysis of data from the past 34 years confirms that sea-ice conditions and thickness off Lützow–Holm Bay in summer are determined mainly by the large-scale pattern of atmospheric pressure in December.

Item Details

Item Type:Refereed Article
Keywords:sea-ice thickness, electromagnetic-induction measurements, Antarctic Ocean, pack-ice zone, Lützow-Holm Bay
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Antarctic and Sub-Antarctic Oceanography
Author:Tamura, T (Dr Takeshi Tamura)
ID Code:114489
Year Published:2016
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-02-16
Last Modified:2017-02-22
Downloads:0

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