Changes in ice-shelf buttressing following the collapse of Larsen A Ice Shelf, Antarctica, and the resulting impact on tributaries

Changes in ice-shelf buttressing following the collapse of Larsen A Ice Shelf, Antarctica, and the resulting impact on tributaries
复制标题

南极洲拉森 A 冰架崩塌后冰架支撑的变化及其对支流的影响

DOI:
10.1017/jog.2016.77
复制
发表时间:
2016
影响因子:
3.4
通讯作者:
ROYSTON S
ROYSTON S
中科院分区:
地球科学3区
文献类型:
--
作者:
ROYSTON S

文献摘要

参考文献

被引文献

相似文献

南极半岛主要的质量损失过程是冰架崩塌,包括1995年初的拉森A冰架。在这次崩溃之后,其支流冰川迅速加速和变薄。我们模拟了这种冰架崩塌对上游支流的影响,并与使用新的表面速度和冰厚度数据集的观测结果进行了比较。使用一个两个水平维度的浅陆架近似模型,我们能够复制所观察到的表面速度的大幅度增加,发生在南极半岛的Drygalski冰川。模型结果表明,瞬时的两倍增加,在整个接地线的磁通量,完全由减少背应力通过冰架去除。这表明了冰架支撑对接地线上游水流的重要性,并强调了在模拟真实环境时明确包括横向应力的必要性。我们假设,进一步增加的速度和流量观察到的冰架崩溃的结果从瞬态质量再分配效应。再现这些影响是对冰川和冰盖模型研究的下一个更严格的考验。
The dominant mass-loss process on the Antarctic Peninsula has been ice-shelf collapse, including the Larsen A Ice Shelf in early 1995. Following this collapse, there was rapid speed up and thinning of its tributary glaciers. We model the impact of this ice-shelf collapse on upstream tributaries, and compare with observations using new datasets of surface velocity and ice thickness. Using a two-horizontal-dimension shallow shelf approximation model, we are able to replicate the observed large increase in surface velocity that occurred within Drygalski Glacier, Antarctic Peninsula. The model results show an instantaneous twofold increase in flux across the grounding line, caused solely from the reduction in backstress through ice shelf removal. This demonstrates the importance of ice-shelf buttressing for flow upstream of the grounding line and highlights the need to explicitly include lateral stresses when modelling real-world settings. We hypothesise that further increases in velocity and flux observed since the ice-shelf collapse result from transient mass redistribution effects. Reproducing these effects poses the next, more stringent test of glacier and ice-sheet modelling studies.
DOI: --
发表时间: 2014
期刊:
影响因子: --
作者:
T. Albrecht;A. Levermann
通讯作者: A. Levermann
DOI: 10.1016/j.epsl.2015.06.047
发表时间: 2015-10
影响因子: 5.3
作者:
T. Seehaus;S. Marinsek;V. Helm;P. Skvarca;M. Braun
通讯作者: T. Seehaus;S. Marinsek;V. Helm;P. Skvarca;M. Braun
ERS SAR 观测到南极半岛巴塔哥尼亚地区出现明显的冰退缩
DOI: --
发表时间: 1997
期刊:
影响因子: --
作者:
H. Rott;P. Skvarca;W. Rack;M. Stuefer
通讯作者: M. Stuefer
南极半岛北部详细的冰损失模式:冰锋退缩导致广泛的冰损失
DOI: 10.5194/tc-8-2135-2014
发表时间: 2014
期刊: The Cryosphere
影响因子: --
作者:
T. Scambos;E. Berthier;T. Haran;C. Shuman;A. Cook;S. Ligtenberg;J. Bohlander
通讯作者: J. Bohlander
DOI: 10.1038/nclimate2094
发表时间: 2014-02-01
影响因子: 30.7
作者:
Favier, L.;Durand, G.;Le Brocq, A. M.
通讯作者: Le Brocq, A. M.