Evidence for an increasing role of ocean heat in Arctic winter sea ice growth
Evidence for an increasing role of ocean heat in Arctic winter sea ice growth
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DOI：
10.1175/jcli-d-20-0848.1
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发表时间：
2021-03
影响因子：
4.9
通讯作者：
R. Ricker;F. Kauker;A. Schweiger;S. Hendricks;Jinlun Zhang;S. Paul
中科院分区：
文献类型：
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作者：
R. Ricker;F. Kauker;A. Schweiger;S. Hendricks;Jinlun Zhang;S. Paul
我们研究了夏季海冰减少和冬季海洋和表面温度升高如何影响北极海冰的生长。根据2002 - 2019年冬季海冰的卫星观测资料，估算了海冰体积的变化，并将其划分为热力学增长和动力学变化。这两个组成部分进行比较，验证海冰海洋模型迫使再分析数据，以延长观测到1980年，并了解机制，导致观察到的趋势和变化。我们发现，负反馈驱动的增加海冰撤退在夏季产量增加热力学冰增长在冬季在北极边缘海向东从拉普捷夫海到博福特海。然而，在巴伦支海和喀拉海，这种反馈似乎被海洋热通量和空气温度增加的影响所压倒，导致2002-2019年卫星观测得出的热力学冰增长平均为-2 km 3 month-1 yr-1的负趋势。
We investigate how sea ice decline in summer and warmer ocean and surface temperatures in winter affect sea ice growth in the Arctic. Sea ice volume changes are estimated from satellite observations during winter from 2002 to 2019 and partitioned into thermodynamic growth and dynamic volume change. Both components are compared to validated sea ice-ocean models forced by reanalysis data to extend observations back to 1980 and to understand the mechanisms that cause the observed trends and variability. We find that a negative feedback driven by the increasing sea ice retreat in summer yields increasing thermodynamic ice growth during winter in the Arctic marginal seas eastward from the Laptev Sea to the Beaufort Sea. However, in the Barents and Kara Seas, this feedback seems to be overpowered by the impact of increasing oceanic heat flux and air temperatures, resulting in negative trends in thermodynamic ice growth of -2 km3month-1yr-1 on average over 2002-2019 derived from satellite observations.