The Impact of Poleward Moisture and Sensible Heat Flux on Arctic Winter Sea Ice Variability
The Impact of Poleward Moisture and Sensible Heat Flux on Arctic Winter Sea Ice Variability
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DOI：
10.1175/jcli-d-15-0074.1
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发表时间：
2015-07
影响因子：
4.9
通讯作者：
Hyo‐Seok Park;Sukyoung Lee;S. Son;S. Feldstein;Y. Kosaka
中科院分区：
文献类型：
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作者：
Hyo‐Seok Park;Sukyoung Lee;S. Son;S. Feldstein;Y. Kosaka
近几十年来，北极地区的地表变暖最为迅速，尤其是在冬季。在这里，通过利用全球再分析和卫星数据集，它表明，在冬季向北流入北极的水分通量在1-2周内增强了30-40 W m−2的向下红外辐射（IR）。随后，格陵兰海、巴伦支海和喀拉海的海冰浓度下降了10%。气候模式模拟结果表明，在强下向红外事件的早期，海冰的漂移导致海冰厚度的减小，但在一周内，累积下向红外效应占主导地位。进一步的分析表明，强烈的向下红外线事件之前的几天，热带印度洋和西太平洋上空的对流增强。这一发现表明，海冰预测可以受益于对热带对流和随之而来的行星波动力学的更好理解。
AbstractThe surface warming in recent decades has been most rapid in the Arctic, especially during the winter. Here, by utilizing global reanalysis and satellite datasets, it is shown that the northward flux of moisture into the Arctic during the winter strengthens the downward infrared radiation (IR) by 30–40 W m−2 over 1–2 weeks. This is followed by a decline of up to 10% in sea ice concentration over the Greenland, Barents, and Kara Seas. A climate model simulation indicates that the wind-induced sea ice drift leads the decline of sea ice thickness during the early stage of the strong downward IR events, but that within one week the cumulative downward IR effect appears to be dominant. Further analysis indicates that strong downward IR events are preceded several days earlier by enhanced convection over the tropical Indian and western Pacific Oceans. This finding suggests that sea ice predictions can benefit from an improved understanding of tropical convection and ensuing planetary wave dynamics.