Sea ice convergence along the Arctic coasts of Greenland and the Canadian Arctic Archipelago: Variability and extremes (1992–2014)
Sea ice convergence along the Arctic coasts of Greenland and the Canadian Arctic Archipelago: Variability and extremes (1992–2014)
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格陵兰岛和加拿大北极群岛北极海岸的海冰汇聚：变化和极端情况（1992-2014）
DOI：
10.1002/2015gl065462
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发表时间：
2015
影响因子：
5.2
通讯作者：
R. Kwok
中科院分区：
文献类型：
--
作者：
R. Kwok
2013年夏季之后，在格陵兰岛和加拿大北极群岛的北极海岸发现了冰盖厚度分布中由辐合引起的尾部。受此启发，引入了归一化冰收敛指数（ICI）来检查 23 年记录（1992-2014）每月冰漂移的变化和收敛极端情况。研究了环流模式的大规模组合、区域收敛和发散的特征。事实上，ICI 显示 2013 年 6 月的收敛事件是一个极端事件（即 ICI > 2）。此外，继 2012 年创纪录的夏季最小冰范围（SMIE）之后，在 17 个月的时间里，有 9 个月的 ICI 为正值（即 >1）；这组积极的 ICI 带来的冰动态印记可能导致 2013 年和 2014 年 SMIE 更高。讨论了趋同对 SMIE 的影响，并强调了 2013 年北极冰量的增加。
After the summer of 2013, a convergence‐induced tail in the thickness distribution of the ice cover is found along the Arctic coasts of Greenland and Canadian Arctic Archipelago. Prompted by this, a normalized ice convergence index (ICI) is introduced to examine the variability and extremes in convergence in a 23 year record (1992–2014) of monthly ice drift. Large‐scale composites of circulation patterns, characteristic of regional convergence and divergence, are examined. Indeed, the ICI shows the June 2013 convergence event to be an extreme (i.e., ICI > 2). Furthermore, there is a cluster of 9 months over a 17 month period with positive ICIs (i.e., >1) following the record summer minimum ice extent (SMIE) in 2012; the imprint of ice dynamics from this cluster of positive ICIs likely contributed to higher SMIEs in 2013 and 2014. The impact of convergence on SMIE is discussed, and the increase in Arctic ice volume in 2013 is underscored.