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DOI | 10.1029/2021GL093853 |
Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime | |
R. Drews; C. T. Wild; O. J. Marsh; W. Rack; T. A. Ehlers; N. Neckel; V. Helm | |
2021-09-28 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Tidal modulation of ice streams and their adjacent ice shelves is a real-world experiment to understand ice-dynamic processes. We observe the dynamics of Priestley Glacier, Antarctica, using Terrestrial Radar Interferometry (TRI) and GNSS. Ocean tides are predominantly diurnal but horizontal GNSS displacements oscillate also semi-diurnally. The oscillations are strongest in the ice shelf and tidal signatures decay near-linearly in the TRI data over 10 km upstream of the grounding line. Tidal flexing is observed 6 km upstream of the grounding line including cm-scale uplift. Tidal grounding line migration is small and 40 % of the ice thickness. The frequency doubling of horizontal displacements relative to the ocean tides is consistent with variable ice-shelf buttressing demonstrated with a visco-elastic Maxwell model. Taken together, this supports previously hypothesized flexural ice softening in the grounding-zone through tides and offers new observational constraints for the role of ice rheology in ice-shelf buttressing. |
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/338898 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | R. Drews,C. T. Wild,O. J. Marsh,et al. Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime[J]. Geophysical Research Letters,2021. |
APA | R. Drews.,C. T. Wild.,O. J. Marsh.,W. Rack.,T. A. Ehlers.,...&V. Helm.(2021).Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime.Geophysical Research Letters. |
MLA | R. Drews,et al."Grounding-zone flow variability of Priestley Glacier, Antarctica, in a diurnal tidal regime".Geophysical Research Letters (2021). |
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