Competing Effects of Elevated Vertical Mixing and Increased Freshwater Input on the Stratification and Sea Ice Cover in a Changing Arctic Ocean
Competing Effects of Elevated Vertical Mixing and Increased Freshwater Input on the Stratification and Sea Ice Cover in a Changing Arctic Ocean
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DOI：
10.1175/jpo-d-15-0174.1
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发表时间：
2016-04
影响因子：
3.5
通讯作者：
P. Davis;C. Lique;H. Johnson;J. Guthrie
中科院分区：
文献类型：
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作者：
P. Davis;C. Lique;H. Johnson;J. Guthrie
摘要北冰洋正在经历一个快速转变的时期。预计淡水输入将增加，北极海冰的减少可能会推动无冰期垂直混合的周期性增加。在这里，北冰洋的一维模型被用来探索这些竞争过程将如何影响分层，冷盐跃层的稳定性，以及在表面的海冰覆盖。最初，较强的切变导致垂直混合升高，导致混合层变暖。然而，温度的变化太小，不会影响海冰覆盖。最重要的是，在欧亚海盆，升高的切变也加深了盐跃层，加强了大西洋水温跃层上的层结，减少了垂直热通量。大约十年后，这种效应占主导地位，混合层开始冷却。海冰覆盖只有显着的影响，如果升高的混合是足以侵蚀与冷高压相关的层化障碍。
AbstractThe Arctic Ocean is undergoing a period of rapid transition. Freshwater input is projected to increase, and the decline in Arctic sea ice is likely to drive periodic increases in vertical mixing during ice-free periods. Here, a 1D model of the Arctic Ocean is used to explore how these competing processes will affect the stratification, the stability of the cold halocline, and the sea ice cover at the surface. Initially, stronger shear leads to elevated vertical mixing that causes the mixed layer to warm. The change in temperature, however, is too small to affect the sea ice cover. Most importantly, in the Eurasian Basin, the elevated shear also deepens the halocline and strengthens the stratification over the Atlantic Water thermocline, reducing the vertical heat flux. After about a decade this effect dominates, and the mixed layer begins to cool. The sea ice cover can only be significantly affected if the elevated mixing is sufficient to erode the stratification barrier associated with the cold h...