Mapping of sea ice production for Antarctic coastal polynyas
Mapping of sea ice production for Antarctic coastal polynyas
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DOI：
10.1029/2007gl032903
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发表时间：
2008-04
影响因子：
5.2
通讯作者：
T. Tamura;K. Ohshima;S. Nihashi
中科院分区：
文献类型：
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作者：
T. Tamura;K. Ohshima;S. Nihashi
南极沿海冰间湖活跃的海冰生成导致稠水的形成，最终导致南极底水（AABW）的形成。这项研究基于热通量计算和来自卫星数据的冰厚度数据，首次绘制了南极海洋的海冰生成图。罗斯冰架冰间湖地区的产冰量最高。从 1990 年代到 2000 年代，那里的冰产量减少了~30%，这可能是导致最近 AABW 更新的原因之一。东南极洲的达恩利角冰间湖被发现是第二高产量区，表明可能存在 AABW 形成区。据我们估计，大约10%的南大洋海冰是由主要的南极沿海冰间湖产生的。该地图提供了冰覆盖区域的表面热通量和盐通量条件，但目前人们对此还没有很好的了解。
Active sea‐ice production in Antarctic coastal polynyas causes dense water formation, finally leading to Antarctic Bottom Water (AABW) formation. This study gives the first mapping of sea ice production in the Antarctic Ocean, based on heat‐flux calculation with ice thickness data derived from satellite data. The highest ice production occurs in the Ross Ice Shelf Polynya region. The ice production there decreased by ∼30% from the 1990s to the 2000s, which can be one candidate for causing the recent freshening of AABW. The Cape Darnley polynya in East Antarctica is found to be the second highest production area, suggesting a possible AABW formation area. According to our estimation, around 10% of Southern Ocean sea ice is produced in the major Antarctic coastal polynyas. The mapping provides surface heat‐ and salt‐flux conditions in the ice‐covered region, which have not been well understood.