The response of Petermann Glacier, Greenland, to large calving events, and its future stability in the context of atmospheric and oceanic warming
The response of Petermann Glacier, Greenland, to large calving events, and its future stability in the context of atmospheric and oceanic warming
复制标题
格陵兰岛彼得曼冰川对大型崩解事件的响应及其在大气和海洋变暖背景下的未来稳定性
DOI：
10.3189/2012jog11j242
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发表时间：
2012
影响因子：
3.4
通讯作者：
D. Floricioiu
中科院分区：
文献类型：
--
作者：
F. Nick;A. Luckman;A. Vieli;C. Veen;D. As;R. Wal;F. Pattyn;A. Hubbard;D. Floricioiu
这项研究评估了2010年大规模冰川崩解事件对格陵兰彼得曼冰川当前和未来稳定性的影响，并确定了冰川与气候和海洋系统的不同组成部分的相互作用。我们使用一个数值冰流模型，该模型捕捉了冰川质量收支的主要方面，控制冰川流动的阻力，并包括动态崩解。卫星观测和模型结果表明，由于相对较宽和较薄的冰舌的侧向阻力较小，最近25%的漂浮舌头的断裂并未导致冰川明显加速。我们证明，彼得曼冰川的季节性加速主要是由融水润滑而不是峡湾的冻结条件驱动的。结果还表明，次陆架海洋融化可能会对彼得曼冰川未来的稳定性产生深远的影响，强调迫切需要更多的观测，并更好地了解峡湾温度变化和环流。
This study assesses the impact of a large 2010 calving event on the current and future stability of Petermann Glacier, Greenland, and ascertains the glacier's interaction with different components of the climate and ocean system. We use a numerical ice-flow model that captures the major aspects of the glacier's mass budget, the resistive forces controlling glacier flow, and includes dynamic calving. Satellite observations and model results show that the recent break-off of 25% of the floating tongue did not result in a significant glacier speed-up due to the low lateral resistance of this relatively wide and thin ice tongue. We demonstrate that seasonal speed-up at Petermann Glacier is mainly driven by meltwater lubrication rather than freeze-up conditions in the fjord. Results also show that sub-shelf ocean melt may have a profound effect on the future stability of Petermann Glacier, emphasizing the urgent need for more observations, and a better understanding of fjord temperature variability and circulation.
影响因子：
18.3
作者：
Bartholomew, Ian;Nienow, Peter;Sole, Andrew
通讯作者：
Sole, Andrew