Marine ice regulates the future stability of a large Antarctic ice shelf.
Marine ice regulates the future stability of a large Antarctic ice shelf.
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DOI：
10.1038/ncomms4707
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发表时间：
2014-04-22
影响因子：
16.6
通讯作者：
Sammonds, Peter R.
中科院分区：
文献类型：
--
作者：
Kulessa, Bernd;Jansen, Daniela;Luckman, Adrian J.;King, Edward C.;Sammonds, Peter R.
1995年和2002年南极半岛拉森A和B冰架的崩塌证实了气候变暖向南传播对该地区的影响。Larsen B的南部邻居Larsen C是南极洲第四大冰架，最近的质量和动力变化可能预示着类似的不稳定性。在这里，使用经过验证的冰架模型运行在诊断模式下，卫星和现场地球物理数据的约束，我们确定这种潜在的不稳定性的性质。我们证明，目前的空间分布和方向的主应力在拉森C冰架内类似于那些在崩溃前拉森B。当拉森B的稳定锋面部分在1995年消失时，剩下的不稳定的大陆架加速，崩溃并最终崩溃。我们假设，拉森C冰架可能会遭受类似的命运，如果它不稳定的温暖和机械柔软的海冰，夹带在狭窄的缝合带。 南极拉森C冰架的不稳定迹象引发了人们的担忧，即它可能很快就会像它的北方邻居拉森B一样崩溃。Kulessa等人将联合收割机的冰架模型与卫星和地球物理数据相结合，表明尽管动力学相似，但Larsen C目前是由海冰稳定的。
The collapses of the Larsen A and B ice shelves on the Antarctic Peninsula in 1995 and 2002 confirm the impact of southward-propagating climate warming in this region. Recent mass and dynamic changes of Larsen B’s southern neighbour Larsen C, the fourth largest ice shelf in Antarctica, may herald a similar instability. Here, using a validated ice-shelf model run in diagnostic mode, constrained by satellite and in situ geophysical data, we identify the nature of this potential instability. We demonstrate that the present-day spatial distribution and orientation of the principal stresses within Larsen C ice shelf are akin to those within pre-collapse Larsen B. When Larsen B’s stabilizing frontal portion was lost in 1995, the unstable remaining shelf accelerated, crumbled and ultimately collapsed. We hypothesize that Larsen C ice shelf may suffer a similar fate if it were not stabilized by warm and mechanically soft marine ice, entrained within narrow suture zones. Signs of instability in the Antarctic Larsen C ice shelf have raised concerns that it might soon collapse like its northern neighbour Larsen B. Kulessa et al. combine an ice-shelf model with satellite and geophysical data to show that despite dynamic similarities, Larsen C is presently stabilized by marine ice.
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影响因子：
64.8
作者：
Pritchard, H. D.;Ligtenberg, S. R. M.;Padman, L.
通讯作者：
Padman, L.
DOI：
10.3189/172756404781814005
发表时间：
2004-01-01
期刊：
ANNALS OF GLACIOLOGY, VOL 39, 2004
影响因子：
--
作者：
Rack, W;Rott, H
通讯作者：
Rott, H
影响因子：
5.2
作者：
Holland, Paul R.;Corr, Hugh F. J.;Tedesco, Marco
通讯作者：
Tedesco, Marco
影响因子：
3.4
作者：
Craven, Mike;Allison, Ian;Warner, Roland
通讯作者：
Warner, Roland
影响因子：
3.4
作者：
Jansen, D.;Kulessa, B.;Glasser, N. F.
通讯作者：
Glasser, N. F.