Evidence of Arctic sea ice thinning from direct observations
Evidence of Arctic sea ice thinning from direct observations
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DOI：
10.1002/2014gl060369
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发表时间：
2014-07
影响因子：
5.2
通讯作者：
A. Renner;S. Gerland;C. Haas;G. Spreen;J. Beckers;E. Hansen;M. Nicolaus;Harvey Goodwin
中科院分区：
文献类型：
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作者：
A. Renner;S. Gerland;C. Haas;G. Spreen;J. Beckers;E. Hansen;M. Nicolaus;Harvey Goodwin
北极海冰覆盖面积正在迅速缩小，但对冰变薄的直接、长期评估仍然具有挑战性。根据弗拉姆海峡融化季节末海冰厚度的现场测量结果构建的一个新的时间序列显示，2003-2012年期间，海冰厚度变薄了50%以上。沿沿着79°N的模态和平均冰厚分别以0.3和0.2 m/年的速率减少，长期平均值为2.5和3 m。空中观测显示，在春季海峡两岸存在东西向的厚度梯度，但在夏季由于来自更多不同源区的平流而没有。冰厚的年际变化与冰源区之间没有明显的关系。因此，观察到的变薄可能是北极范围内冰厚度减少的结果，而输出冰类型的潜在变化起着次要作用。
The Arctic sea ice cover is rapidly shrinking, but a direct, longer‐term assessment of the ice thinning remains challenging. A new time series constructed from in situ measurements of sea ice thickness at the end of the melt season in Fram Strait shows a thinning by over 50% during 2003–2012. The modal and mean ice thickness along 79°N decreased at a rate of 0.3 and 0.2 m yr−1, respectively, with long‐term averages of 2.5 and 3 m. Airborne observations reveal an east‐west thickness gradient across the strait in spring but not in summer due to advection from more different source regions. There is no clear relationship between interannual ice thickness variability and the source regions of the ice. The observed thinning is therefore likely a result of Arctic‐wide reduction in ice thickness with a potential shift in exported ice types playing a minor role.