极地研究

极地研究 ›› 2010, Vol. 21 ›› Issue (1-English): 1-10.DOI: 10.3724/SP.J.1085.2010.00001

• 研究论文 •    下一篇

Analysis on the crystals of sea ice cores derived from Weddell Sea, Antarctica

 Li Zhijun1, Nicolaus Marcel2, Toyota Takenobu3 and Haas Christian4   

  1. 1 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 116024 Dalian, China;
    2 Norwegian Polar Institute, 9296 Troms, Norway;
    3 Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;
    4 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada
  • 出版日期:1960-03-30 发布日期:1960-03-30
  • 通讯作者: Li Zhijun

Analysis on the crystals of sea ice cores derived from Weddell Sea, Antarctica

 Li Zhijun1, Nicolaus Marcel2, Toyota Takenobu3 and Haas Christian4   

  1. 1 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 116024 Dalian, China;
    2 Norwegian Polar Institute, 9296 Troms, Norway;
    3 Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;
    4 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada
  • Online:1960-03-30 Published:1960-03-30
  • Contact: Li Zhijun

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摘要：

In order to understand the sea ice types and its region of origin frozen in Weddell Sea, 27 ice cores were taken from Weddell Sea, Antarctica during September and October, 2006. Their crystals were analyzed, and their ice forming processes were evaluated based on the crystals. Photos of the thin sections from two whole ice cores, and from polygonal granular superimposed ice were taken as well as corresponding stratigraphy descriptions. Vertical profiles of salinity, density and grain size were also obtained. Based on ice core structural texture, the findings include that: 1) although large and smooth ice floes were selected as the investigation sites, the ice sheet at the sampling position maybe formed by raftedice, consolidated ice ridges and second-year ice which were affected by dynamic and thermodynamic processes together subsequently. Ice formed in pure thermal growth comprises minority. The polygonal granular super imposed ice from refrozen wetted dense snow is one type of the ice in Antarctica. 2) Of the all 27 ice cores, the granular, mixed granular-columnar and columnar crystals in sea ice occupy 28.7%, 14.4% and 55.2%, respectively. 3) The pure thermal growth ice is predominant in marginal sea ice zone; the rafted ice and consolidated ice ridges, even second-year ice and polygonal granular superimposed ice from dynamic and thermal effects were found in front of Larsen A Ice Shelf; the thermal growth ice froze in the polynyas of Larsen A, and was transferred outwards.

关键词: Antarctic, sea ice, crystal, salinity, density

Abstract:

In order to understand the sea ice types and its region of origin frozen in Weddell Sea, 27 ice cores were taken from Weddell Sea, Antarctica during September and October, 2006. Their crystals were analyzed, and their ice forming processes were evaluated based on the crystals. Photos of the thin sections from two whole ice cores, and from polygonal granular superimposed ice were taken as well as corresponding stratigraphy descriptions. Vertical profiles of salinity, density and grain size were also obtained. Based on ice core structural texture, the findings include that: 1) although large and smooth ice floes were selected as the investigation sites, the ice sheet at the sampling position maybe formed by raftedice, consolidated ice ridges and second-year ice which were affected by dynamic and thermodynamic processes together subsequently. Ice formed in pure thermal growth comprises minority. The polygonal granular super imposed ice from refrozen wetted dense snow is one type of the ice in Antarctica. 2) Of the all 27 ice cores, the granular, mixed granular-columnar and columnar crystals in sea ice occupy 28.7%, 14.4% and 55.2%, respectively. 3) The pure thermal growth ice is predominant in marginal sea ice zone; the rafted ice and consolidated ice ridges, even second-year ice and polygonal granular superimposed ice from dynamic and thermal effects were found in front of Larsen A Ice Shelf; the thermal growth ice froze in the polynyas of Larsen A, and was transferred outwards.

Key words: Antarctic, sea ice, crystal, salinity, density