Sea ice variation in Luetzow-Holmbukta, Antarctica, during the last fifty years

DOI Web Site 3 Citations 19 References
  • USHIO Shuki
    National Institute of Polar Research, Research Organization of Information and Systems
  • WAKABAYASHI Hiroyuki
    Japan Aerospace Exploration Agency, Marunouchi Kitaguchi BLDG. Now at Department of Computer Science, College of Engineering, Nihon University
  • NISHIO Fumihiko
    Center for Environmental Remote Sensing, Chiba University

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Other Title
  • 過去５０年間にわたる南極リュツォ・ホルム湾定着氷の変動
  • カコ 50ネンカン ニ ワタル ナンキョク リュツォ ホルムワン テイチャクヒョウ ノ ヘンドウ

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Abstract

Satellite images obtained from Lützow-Holmbukta (Lützow-Holm Bay; around 69°S, 38°E), Antarctic, have revealed frequent occurrences of ice-breakup events since the 1980s. Such unstable conditions continued for several to ten-odd years, and its variability coincides well with the characteristics of snow accumulation patterns on sea ice; in other words, breakups are often observed during periods of less snow. In contrast, during the 1950s-70s, landfast ice seems to have been extremely stable, judging from the appearance of a long glacier tongue flowing into the fast-ice field. Expansion and contraction of the floating ice tongue probably depends on its surrounding fast-ice condition; therefore the unstable sea-ice condition for the last two decades has shortened the ice tongue. A decrease in the snow cover on sea ice and warm periods of summer-autumn led to the weakening of the landfast ice as the melt season progressed; broken floes were then transported offshore by the prevailing southerly winds.

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