Rapid response of modern day ice sheets to external forcing
Rapid response of modern day ice sheets to external forcing
复制标题
现代冰盖对外部强迫的快速响应
DOI：
10.1016/j.epsl.2007.03.005
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发表时间：
2007
影响因子：
5.3
通讯作者：
I. Joughin
中科院分区：
文献类型：
--
作者：
J. Bamber;R. Alley;I. Joughin
覆盖南极洲和格陵兰岛的巨大冰盖传统上被认为需要数千年才能对外部作用力做出反应。然而，最近的观察表明，冰盖部分地区的动态变化正在发生几年的时间尺度。数值模型无法预测这些变化，其根本原因仍不确定。有人认为，区域海洋和/或大气变暖是造成这种现象的原因，但将这两种强迫的影响和重要性分开是不可能的。在大多数情况下，大气层相对于海洋的控制作用仍然不确定。在这里，我们回顾了快速变化的观测结果，并根据数值模拟的进展和我们对可能负责的过程的理解，讨论了可能的机制。
The great ice sheets covering Antarctica and Greenland were, traditionally, believed to take thousands of years to respond to external forcing. Recent observations suggest, however, that major changes in the dynamics of parts of the ice sheets are taking place over timescales of years. These changes were not predicted by numerical models, and the underlying cause(s) remains uncertain. It has been suggested that regional oceanic and/or atmospheric warming are responsible but separating the influence and importance of these two forcings has not been possible. In most cases, the role of atmospheric versus oceanic control remains uncertain. Here, we review the observations of rapid change and discuss the possible mechanisms, in the light of advances in numerical modelling and our understanding of the processes that may be responsible.