Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea‐Ice Production
Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea‐Ice Production
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DOI：
10.1029/2020gl091353
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发表时间：
2021-03
影响因子：
5.2
通讯作者：
K. Nakata;K. Ohshima;S. Nihashi
中科院分区：
文献类型：
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作者：
K. Nakata;K. Ohshima;S. Nihashi
在最近的原位观测和高分辨率卫星观测中，人们越来越认识到南极沿海冰融区活跃区域和相关的高海冰产量的重要性。然而，目前对活跃区的发生和空间分布尚不清楚。基于AMSR - E的薄冰算法，我们首次绘制了南极沿海多冰区活跃区。考虑到活跃的巴西区域，绘制了海冰生成图。活跃冰原区主要分布在南极洲东部，特别是非常靠近海岸的地区，在当地导致非常高的产冰率，超过20米/年。对于巴西占优势的多冰区，估计产冰量比以前的研究高出约20%-50%。对所有主要冰裂湖的分析表明，活跃冰裂湖的范围取决于海上风和气温，而产冰仅由海上风决定。
The importance of the area of active frazil and associated high sea‐ice production in Antarctic coastal polynyas has been increasingly recognized in recent in situ and high‐resolution satellite observations. However, the occurrence and spatial distribution of active‐frazil area are not well understood. We present the first mapping of active‐frazil area for Antarctic coastal polynyas, based on the thin ice algorithm of AMSR‐E that discriminates active‐frazil area. Mapping of sea‐ice production is presented by taking account of active‐frazil area. Active‐frazil area is predominant along East Antarctica, particularly very close to the coast, locally leading to very high ice‐production rates exceeding 20 m/yr. For frazil‐dominant polynyas, estimated ice production is ∼20%–50% higher compared with previous studies. Analyses of all the major polynyas suggest that active‐frazil extent depends on offshore wind and air temperature, while ice production is determined by offshore wind only.