Abstract The sea ice component of a regional high-resolution ocean model is improved, with particular attention to accurate representation of the salinity budget for the coupled system. The impact of this improvement is shown first using a one-dimensional test and then the realistic model simulation of the Eastern Bering Sea for the relatively high sea ice extent winter of 2009–10. Improvements to the model ice-ocean salt flux parameterization are demonstrated by comparison of model shelf salinity fields with observations from moorings and CTDs. As polynya regions can strongly influence winter salinity distributions on the Bering Sea shelf, model ice concentrations are compared to satellite estimates for several regions. Areas with a tendency to exhibit higher than average winter open water area include St. Lawrence Island and the southern coast of the Chukotka Peninsula. A new methodology is proposed analyzing the evolution of the salinity distribution with the aid of salt flux tracers that track occurrence of brine and meltwater separately. These demonstrate how cold winters on the Bering Sea shelf are characterized by a freshening and stratifying of the mid- to outer- shelf and an increase of salinity on the inner shelf. Use of an ice-age tracer in the model reveals an anticyclonic circulation of sea ice in mid-winter, as the Bering slope current and Anadyr current recirculate ice that has been transported south-southwestward by the predominant winds. The characteristics of coastal polynya regions are quantitatively compared and a model transect extending from the St. Lawrence polynya to the shelf break is analyzed to help illustrate the temporal and spatial variability of stratification and circulation occurring as the sea ice advances and retreats over the winter season.

中文翻译：

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白令海架冬季环流的高分辨率耦合冰海模型。第二部分：波里尼亚斯和陆架盐度分布

摘要 改进了区域高分辨率海洋模型的海冰分量，特别关注耦合系统盐度收支的准确表示。这种改进的影响首先使用一维测试显示，然后是东白令海在 2009-10 年冬季海冰范围相对较高的情况下的真实模型模拟。模型冰-海洋盐通量参数化的改进通过模型架盐度场与系泊和 CTD 观测的比较来证明。由于冰间湖地区可以强烈影响白令海架上的冬季盐度分布，因此将模型冰浓度与几个地区的卫星估计值进行比较。倾向于表现出高于平均冬季开放水域的区域包括圣彼得堡。劳伦斯岛和楚科奇半岛南部海岸。提出了一种新的方法，借助分别跟踪盐水和融水发生的盐通量示踪剂来分析盐度分布的演变。这些表明白令海陆架寒冷的冬天以中到外陆架的清新和分层以及内陆架的盐度增加为特征。在模型中使用冰河时代示踪剂揭示了仲冬期间海冰的反气旋环流，因为白令斜坡洋流和阿纳德尔洋流使被主导风向南-西南方向移动的冰再循环。定量比较了沿海冰沼地区的特征，并从圣彼得堡延伸出一个模型断面。