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2005 Fiscal Year Final Research Report Summary

Effect in atmosphere-ocean changes reflected by frequent large breakups of landfast ice and ice shelf in the Antarctic

Research Project

Project/Area Number 15510015
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionNational Institute of Polar Research

Principal Investigator

USHIO Shuki  National Institute of Polar Research, Division for Research and Education, Research Associate, 研究教育系, 助手 (50211769)

Project Period (FY) 2003 – 2005
KeywordsAntarctic / sea ice / interannual variation / ice navigation / fast ice / pack ice / glacier ice tongue / ice shelf
Research Abstract

Antarctic fast-ice variation has been investigated using satellite images and ship's ice navigation logs, focusing on breakup phenomena in Lutzow-Holmbukta (Lutzow-Holm Bay). Although spatio-temporal scales for breakup events vary somewhat for each event, their commencement is generally in autumn and almost always in the same region. Specifically, the 1997/98 breakup event occurred over a wide area and continued for a long time after the initial breakup. Since then, breakups have repeated until 2004, and a total of 20 annual events have been detected since 1980. Moreover, information from icebreaker navigation logs shows that unstable fast-ice conditions frequently occurred in the 1980s and after the late 1990s. From the analysis of surface meteorological data and the offshore pack-ice distribution, anomalously shallow snow-cover depths and a peculiar retreat pattern of the ice edge are found to be factors that favor fast-ice breakup. The pack ice distribution controls the propagation … More of ocean swell inside the bay ; encroaching swells are likely to mechanically disintegrate fast-ice field during autumn prior to the annual formation of the protective pack-ice cover to the north. Less snow cover also leads to fast-ice weakening as the melt season progresses and broken floes are then transported offshore by prevailing southerly winds.
In this way, the patterns of landfast-ice breakup and formation/persistence likely exert an important influence on the dynamics and thermodynamics of outlet glaciers and also the inland ice sheet. To promote this study, field measurements linked with satellite remote sensing are required to detect glaciological responses to landfast-ice stability in the form of the changing flow characteristics of floating ice tongues and the elevation/thickness distributions of inland drainage basins. Satellite imagery with high spatial resolution is much useful for quantification of the tongue movement of the Shirase Glacier that flows inside Lutzow-Holmbukta. Less

  • Research Products

    (12 results)

All 2004 2003 Other

All Journal Article (12 results)

  • [Journal Article] Sea ice variations in Lutzow-Holmbukta, Antarctica, derived from ice navigation log during the period of 1983-20022004

    • Author(s)
      Shuki Ushio
    • Journal Title

      Proceedings of the Fourteenth (2004) (International Offshore and Polar Engineering Conference)

      Pages: 802-805

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 「しらせ」砕氷航行データが示す南極リュツォ・ホルム湾定着氷の年々変化2004

    • Author(s)
      牛尾収輝
    • Journal Title

      南極資料 48・3

      Pages: 180-190

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Sea ice variations in Lutzow-Holmbukta, Antarctica, derived from ice navigation log during the period of 1983-20022004

    • Author(s)
      Shuki Ushio
    • Journal Title

      Proceedings of the Fourteenth (2004) International Offshore and Polar Engineering Conference

      Pages: 802-805

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Interannual variation of landfast ice condition in Lutzow-Holmbukta, Antarctica, derived from navigation log of icebreaker Shirase2004

    • Author(s)
      Shuki Ushio
    • Journal Title

      Nankyoku Shiryo (Antarctic Record) 48, 3

      Pages: 180-190

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 頻発する南極リュツォ・ホルム湾の海氷流出-1980年〜2003年の海氷状況から-2003

    • Author(s)
      牛尾収輝
    • Journal Title

      南極資料 47・3

      Pages: 338-348

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 海氷研究の現状と将来展望-南極リュツォ・ホルム湾の海氷変動機構の解明を目指して-.2003

    • Author(s)
      牛尾収輝
    • Journal Title

      月刊海洋 (総特集「海氷研究の最前線-衛星リモートセンシング・現地観測からのアプローチ」 35・10

      Pages: 675-680

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 南極リュツォ・ホルム湾で発生する海氷の流出現象2003

    • Author(s)
      牛尾収輝
    • Journal Title

      月刊海洋 (総特集「海氷研究の最前線-衛星リモートセンシング・現地観測からのアプローチ」 35・10

      Pages: 731-735

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Frequent sea-ice breakup in Lutzow-Holmbukta, Antarctica, based on analysis of ice condition from 1980 to 20032003

    • Author(s)
      Shuki Ushio
    • Journal Title

      Nankyoku Shiryo (Antarctic Record) 47

      Pages: 3338-3348

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Present and future in Antarctic sea-ice studies2003

    • Author(s)
      Shuki Ushio
    • Journal Title

      Kaiyo Monthly 35, 10,

      Pages: 675-680

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Sea ice breakup appeared in Lutzow-Holmbukta, Antarctica2003

    • Author(s)
      Shuki Ushio
    • Journal Title

      Kaiyo Monthly 35, 10

      Pages: 731-735

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Factors affecting fast-ice breakup frequency in Lutzow-Holmbukta, Antarctica

    • Author(s)
      Shuki Ushio
    • Journal Title

      Annals of Glaciology 44(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Factors affecting fast-ice breakup frequency in Lutzow-Holmbukta, Antarctica

    • Author(s)
      Shuki Ushio
    • Journal Title

      Annals of Glaciology 44(in press)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2007-12-13  

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