Recovery mechanisms of Arctic summer sea ice
Recovery mechanisms of Arctic summer sea ice
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DOI：
10.1029/2010gl045698
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发表时间：
2011-01
影响因子：
5.2
通讯作者：
S. Tietsche;D. Notz;J. Jungclaus;J. Marotzke
中科院分区：
文献类型：
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作者：
S. Tietsche;D. Notz;J. Jungclaus;J. Marotzke
我们研究了在大气-海洋环流模式中模拟21世纪世纪气候的北极海冰从规定的无冰夏季条件下的恢复。我们发现，冰的范围通常在两年内恢复。在无冰夏季积累的多余海洋热量在接下来的秋季和冬季迅速返回大气，然后部分通过增加大气顶部的长波排放和部分通过减少低纬度的大气热平流离开北极。海洋热输送对多余热量的损失没有显着贡献。我们的研究结果表明，北极海冰在一个夏季的异常损失是可逆的，因为冰-冰反馈被大规模的恢复机制所缓解。因此，滞后阈值行为（或“临界点”）不太可能发生在北极夏季海冰覆盖在21世纪世纪的下降。
We examine the recovery of Arctic sea ice from prescribed ice‐free summer conditions in simulations of 21st century climate in an atmosphere–ocean general circulation model. We find that ice extent recovers typically within two years. The excess oceanic heat that had built up during the ice‐free summer is rapidly returned to the atmosphere during the following autumn and winter, and then leaves the Arctic partly through increased longwave emission at the top of the atmosphere and partly through reduced atmospheric heat advection from lower latitudes. Oceanic heat transport does not contribute significantly to the loss of the excess heat. Our results suggest that anomalous loss of Arctic sea ice during a single summer is reversible, as the ice–albedo feedback is alleviated by large‐scale recovery mechanisms. Hence, hysteretic threshold behavior (or a “tipping point”) is unlikely to occur during the decline of Arctic summer sea‐ice cover in the 21st century.