Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021GL092950 |
Frictional origin of slip events of the Whillans Ice Stream, Antarctica | |
Gauthier Guerin; Auré; lien Mordret; Diane Rivet; Bradley P. Lipovsky; Brent M. Minchew | |
2021-06-01 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Ice sheet evolution depends on subglacial conditions, with the ice-bed interface’s strength exerting an outsized role on the ice dynamics. Along fast-flowing glaciers, this strength is often controlled by the deformation of subglacial till, making quantification of spatial variations of till strength essential for understanding ice-sheet contribution to sea-level. This task remains challenging due to a lack of in situ observations. We analyze continuous seismic data from the Whillans Ice Plain (WIP), West Antarctica, to uncover spatio-temporal patterns in subglacial conditions. We exploit tidally-modulated stick-slip events as a natural source of sliding variability. We observe a significant reduction of the till seismic wave-speed between the WIP sticky-spots. These observations are consistent with a poroelastic model where the bed experiences relative porosity and effective pressure increases of > 11% during stick-slips. We conclude that dilatant strengthening appears to be an essential mechanism in stabilizing the rapid motion of fast-flowing ice streams. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/329776 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Gauthier Guerin,Auré,lien Mordret,et al. Frictional origin of slip events of the Whillans Ice Stream, Antarctica[J]. Geophysical Research Letters,2021. |
APA | Gauthier Guerin,Auré,lien Mordret,Diane Rivet,Bradley P. Lipovsky,&Brent M. Minchew.(2021).Frictional origin of slip events of the Whillans Ice Stream, Antarctica.Geophysical Research Letters. |
MLA | Gauthier Guerin,et al."Frictional origin of slip events of the Whillans Ice Stream, Antarctica".Geophysical Research Letters (2021). |
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