Thickness distribution, texture and stratigraphy, and a simple probabilistic model for dynamical thickening of sea ice in the southern Sea of Okhotsk
Thickness distribution, texture and stratigraphy, and a simple probabilistic model for dynamical thickening of sea ice in the southern Sea of Okhotsk
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DOI：
10.1029/2003jc002090
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发表时间：
2004-06
影响因子：
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通讯作者：
T. Toyota;T. Kawamura;K. Ohshima;H. Shimoda;M. Wakatsuchi
中科院分区：
文献类型：
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作者：
T. Toyota;T. Kawamura;K. Ohshima;H. Shimoda;M. Wakatsuchi
[1]通过对海冰厚度资料和海冰样品的分析，研究了鄂霍次克海南部海冰厚度分布和冰层结构特征，了解了鄂霍次克海南部海冰的生长过程。冰厚度数据和样本是在2月初，也就是冰的生长季节，在破冰船Soya上获得的。从1991年到2000年，除1995年外，每年冬季在侧甲板上安装的视频监测系统获得的冰层厚度数据表明，平均厚度范围为19±7~55±23 cm，符合泊松分布特征。冰结构分析表明，冰粒结构约占冰层厚度的四分之三，冰层呈层状结构，单位厚度平均为5~10 cm。冰层的地层学和稳定同位素组成表明，雪冰占总冰厚的10%，碎屑冰占总冰厚的10%。这表明，冰的动态增厚过程，如破碎冰的增长和堆积，比凝结增长更重要。基于这些更接近南极而不是北冰洋海冰的特征，我们提出了该地区海冰增厚过程的概念模型。结果表明，该模型能较好地解释南极海冰厚度分布的形态，与南极海冰生长增厚的“煎饼循环”和多次漂流的概念类似。
[1] Sea ice thickness data and sea ice samples were analyzed to examine the characteristics of the ice thickness distribution and ice texture, and to understand ice growth processes in the southern Sea of Okhotsk. Ice thickness data and samples were obtained aboard the icebreaker Soya in early February, the ice growth season. Ice thickness data, which were obtained with a video monitoring system installed on the side deck of the ship each winter from 1991 to 2000 except 1995, show that the average thickness ranges from 19 ± 7 to 55 ± 23 cm and that it matches the characteristics of a Poisson distribution. Ice structure analysis reveals that granular texture occupies about three quarters of the total ice thickness and that the ice exhibits a layered structure with unit thickness averaging 5 to 10 cm. Stratigraphy and stable isotopic composition of the ice indicate that snow ice accounts for 10% and frazil ice accounts for 64% of the total ice thickness. This suggests that dynamic ice thickening processes such as frazil ice growth and piling up are more significant than congelation growth. On the basis of these characteristics, which resemble more those of Antarctic than Arctic sea ice, we propose a conceptual model for the ice thickening process in this region. It is shown that this model can explain the shape of the ice thickness distribution well, and is analogous with the concept of the “pancake cycle” and multiple rafting of Antarctic sea ice growth and thickening.