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2011年1月普里兹湾埃默里冰架附近水文特征

     

摘要

Conductivity, temperature and depth (CTD) data were collected by the R/V Xue Long icebreaker at 24 sites north of trie Amery Ice Shelf. The data showed that in west Prydz Bay, between 71-72°E, there is a clockwise mesoscale eddy, which leads to deeper, colder water, with higher salinity and increased density. As a result of the eddy, the ice shelf water moves eastward and turns to the northeast near 73°30'E. In summer, the thickness of the surface water is about 20 m in the eastern section and about 50 m in the western section, influenced by the mesoscale eddy. Within the water layer less than 50 m, water temperature is slightly higher in the lower layer than at the surface. This is termed a temperature inversion layer. In the western section, there is a density-related ' static instability' phenomenon at depths of about 160-200 m, with layer thicknesses of less than 10 m at many sites. Mixing by advection and diffusion may be the main reason for this instability phenomenon.%分析“雪龙”号2011年在普里兹湾埃默里冰架外缘一条断面上24个站位的CTD观测结果,发现有以下一些水文特征:普里兹湾西部,在71-72.E范围内,存在一个顺时针运动的中尺度涡.由于这个涡旋存在,冰架水主要扩散方向偏东,在73°30'E附近,流向东北;夏季表层水厚度.东部基本在20m,西部受中尺度涡和其他因素的影响,夏季表层水厚度深达50m左右;在50m以浅的水层内,稍深处的水温比表层稍微增高,即通常称为的逆温层,它是结冰、融冰和海冰覆盖变化造成的;在观测断面西部,在160-200m水层内,多站出现“静力不稳定”:即上层密度大于下层,厚度有几米,平流混合扩散可能是这一不稳定现象主要原因.

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