极地研究

极地研究 ›› 1994, Vol. 6 ›› Issue (3): 23-27.

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南极洲纳尔逊冰帽浅层粒雪／冰的晶体组构特征

任贾文;秦大河;刘琛   

  • 出版日期:1994-09-30 发布日期:1994-09-30

CRYSTAL FABRICS OF FIRN/ICE CORES FROM SHALLOW BOREHOLES ON NELSON ICE CAP,ANTARCTICA

  • Online:1994-09-30 Published:1994-09-30

PDF (PC)

899

摘要：

对纳尔逊冰帽３个地点浅层粒雪／冰芯的晶体组构测量表明，冰晶ｃ轴在冰帽表面具有优势方位，２０ｍ深度内普遍出现双扇形组构，在２０－３０ｍ深度具有向单极大型变化的趋势。这与所报道的中低纬度山地温冰川上的晶体组构特征有明显不同。估计大量融水渗浸和再冻结作用对冰晶组构有重要影响，但详细机制尚不清楚

关键词: 渗浸冻结粒雪／冰,冰晶组构,纳尔逊冰帽,南极洲

Abstract:

The crystal fabric measurement of three shallow firn/ice cores from Nelson Ice Cap shows that c axes orientation is preferred at the surface.Within 20m depth,the double fan pattern fabric is dominant.Between 20 and 30m depth,the fabric pattern has a tendency to change to the single maximum pattern.These are very different from that reported from mountain temperate glaciers in the lower latitudes.The intense meltwater percolation and refreezing may have an important effect,but the mechanism needs to be studied further in detail.