Sea Ice Formation in a Coupled Climate Model Including Grease Ice
Sea Ice Formation in a Coupled Climate Model Including Grease Ice
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DOI：
10.1029/2020ms002103
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发表时间：
2020-08
影响因子：
6.8
通讯作者：
S. Mackie;P. Langhorne;H. Heorton;I. Smith;D. Feltham;D. Schroeder
中科院分区：
文献类型：
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作者：
S. Mackie;P. Langhorne;H. Heorton;I. Smith;D. Feltham;D. Schroeder
海冰的形成过程发生在次网格尺度上，因此描述这一过程的详细物理过程一般不会在气候模式中得到体现。一个可能的后果是在模型模拟中过早关闭开放水域，这可能导致海洋和大气之间的热量和气体交换的错误表达。这项工作展示了一个更现实的海冰形成模型的实施，将脂冰引入风和海洋应力依赖的水和新海冰之间的中间状态。我们使用完全耦合的陆地-大气-海洋-海冰模式HadGEM 3-GC 3.1，并使用1964年至2013年的新油脂冰方案进行了三员集合。将我们的海冰结果与现有的没有油脂冰形成的集合进行比较，显示北极海冰厚度和体积增加。在南极，包括脂冰过程的结果在两个模拟海冰浓度和厚度的大的局部变化，但没有改变的总面积或体积。
Sea ice formation processes occur on subgrid scales, and the detailed physics describing the processes are therefore not generally represented in climate models. One likely consequence of this is the premature closing of areas of open water in model simulations, which may result in a misrepresentation of heat and gas exchange between the ocean and atmosphere. This work demonstrates the implementation of a more realistic model of sea ice formation, introducing grease ice as a wind and oceanic stress‐dependent intermediary state between water and new sea ice. We use the fully coupled land‐atmosphere‐ocean‐sea ice model, HadGEM3‐GC3.1 and perform a three‐member ensemble with the new grease ice scheme from 1964 to 2013. Comparing our sea ice results with the existing ensemble without grease ice formation shows an increase in sea ice thickness and volume in the Arctic. In the Antarctic, including grease ice processes results in large local changes to both simulated sea ice concentration and thickness, but no change to the total area or volume.