Cascading lake drainage on the Greenland Ice Sheet triggered by tensile shock and fracture.
Cascading lake drainage on the Greenland Ice Sheet triggered by tensile shock and fracture.
复制标题
DOI:
10.1038/s41467-018-03420-8
复制
发表时间:
2018-03-14
影响因子:
16.6
通讯作者:
Pettersson R
中科院分区:
文献类型:
--
作者:
Christoffersen P;Bougamont M;Hubbard A;Doyle SH;Grigsby S;Pettersson R
Supraglacial lakes on the Greenland Ice Sheet are expanding inland, but the impact on ice flow is equivocal because interior surface conditions may preclude the transfer of surface water to the bed. Here we use a well-constrained 3D model to demonstrate that supraglacial lakes in Greenland drain when tensile-stress perturbations propagate fractures in areas where fractures are normally absent or closed. These melt-induced perturbations escalate when lakes as far as 80 km apart form expansive networks and drain in rapid succession. The result is a tensile shock that establishes new surface-to-bed hydraulic pathways in areas where crevasses transiently open. We show evidence for open crevasses 135 km inland from the ice margin, which is much farther inland than previously considered possible. We hypothesise that inland expansion of lakes will deliver water and heat to isolated regions of the ice sheet’s interior where the impact on ice flow is potentially large. Lakes on the Greenland Ice Sheet transfer water to the bed when they drain, but the impact is unknown. Here, the authors use a 3D model to show that lakes drain when fractures form, causing a chain reaction in which cascading lake drainages extend inland and deliver water to previously isolated regions of the bed.
登录
查看更多内容
影响因子:
16.6
作者:
通讯作者:
--
DOI:
10.1002/2014jf003333
发表时间:
2015-06
期刊:
Journal of geophysical research. Earth surface
影响因子:
--
作者:
Dow CF;Kulessa B;Rutt IC;Tsai VC;Pimentel S;Doyle SH;van As D;Lindbäck K;Pettersson R;Jones GA;Hubbard A
通讯作者:
Hubbard A
影响因子:
5.8
作者:
Cowton, T.;Nienow, P.;Mair, D.
通讯作者:
Mair, D.
影响因子:
3.4
作者:
Fitzpatrick, Andrew A. W.;Hubbard, Alun;Jones, Glenn A.
通讯作者:
Jones, Glenn A.
DOI:
10.1098/rsta.2006.1797
发表时间:
2006-07-15
影响因子:
5
作者:
Hindmarsh, Richard C. A.
通讯作者:
Hindmarsh, Richard C. A.