Physical, structural, and isotopic characteristics and growth processes of fast sea ice in Lutzow-Holm Bay, Antarctica
Physical, structural, and isotopic characteristics and growth processes of fast sea ice in Lutzow-Holm Bay, Antarctica
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DOI：
10.1029/96jc03206
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发表时间：
1997-02-15
影响因子：
3.6
通讯作者：
Ushio, S
中科院分区：
文献类型：
--
作者：
Kawamura, T;Ohshima, KI;Ushio, S
1990年至1991年，日本南极研究考察队在南极洲毛德皇后地和恩德比地附近进行了海冰/海洋研究。在Lutzow-Holm湾进行了为期2年的多年陆地固定海冰观测，以确定冰雪特征和冰生长过程。在海湾的积雪深度达到1.0至1.5米的冬季在近海位置的大值。从冰厚度测量的分析，它被证实，深积雪覆盖的快速冰增长很少在冬季，但在夏季大幅增厚。冰芯结构，盐度和稳定同位素组成的基础上，我们得出结论，夏季的增长是由向上增长的顶部的冰，雪冰和叠加的冰形成的贡献。这些过程是海冰增长的主要贡献者，只有在积雪量大的地方才具有这些特征。在积雪量低的地区，没有地表生长。南极洲海冰上的叠加冰形成以前没有报道过。还发现了积雪融化的证据，这是叠加冰形成的先决条件。
A sea-ice/ocean study was conducted off Queen Maud Land and Enderby Land, Antarctica, from 1990 to 1991 by the Japanese Antarctic Research Expedition. Observations of multiyear land fast sea ice were made in Lutzow-Holm Bay over a period of 2 years to determine the snow and ice characteristics and ice growth processes. The snow depth in the bay reached large values of 1.0 to 1.5 m during the winter season at offshore locations. From the analysis of ice thickness measurements, it is confirmed that the fast ice with deep snow cover grew little in winter but substantially thickened during the summer months. On the basis of ice core structure, salinity, and stable isotopic composition, we conclude that the summer growth was caused by upward growth at the top of the ice to which snow ice and superimposed ice formation contribute. These processes were the primary contributors to sea-ice growth and characteristics only where the snow accumulation was large. In areas of low snow accumulation, there was no surface growth. Superimposed ice formation on sea ice in Antarctica has not been reported previously. Evidence for snow cover melting, which is a prerequisite for superimposed ice formation, was also found.