Articles | Volume 19, issue 6
https://doi.org/10.5194/tc-19-2087-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-19-2087-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Viscoelastic mechanics of tidally induced lake drainage in the grounding zone
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK
Richard F. Katz
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK
Laura A. Stevens
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK
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We characterize the magnitude and variability of transient speed-ups across a GPS array in western Greenland in 2011 and 2012. While we find no relationship between speed-up and runoff, late-season events have larger speed-up amplitudes and more spatially uniform patterns of speed-up across the GPS array compared to early season events. These results reflect an evolution toward a less efficient drainage system late in the melt season, with a pervasive system of open surface-to-bed conduits.
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Magmatic dykes transport magma to the Earth's surface, sometimes causing eruptions. We advanced a model of dyking, treating it as plastic deformation in a porous medium, unlike the classic model that treats dykes as fractures in elastic solids. Comparing the two, we found the plastic model aligns with the fracture model in dyke speed and energy consumption, despite quantitative differences. This new method could be a powerful tool for understanding volcanic processes during tectonic activity.
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Ice shelves are thick floating layers of glacier ice extending from the glaciers on land that buttress much of the Antarctic Ice Sheet and help to protect it from losing ice to the ocean. However, the stability of ice shelves is vulnerable to meltwater lakes that form on their surfaces during the summer. This study focuses on the northern George VI Ice Shelf on the western side of the AP, which had an exceptionally long and extensive melt season in 2019/2020 compared to the previous 31 seasons.
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Short summary
In Antarctica, supraglacial lakes often form near grounding lines due to surface melting. We model viscoelastic tidal flexure in these regions to assess its contribution to lake drainage via hydrofracturing. Results show that tidal flexure and lake-water pressure jointly control drainage near unconfined grounding lines. Sensitivity analysis indicates the importance of the Maxwell time of ice in modulating the tidal response.
In Antarctica, supraglacial lakes often form near grounding lines due to surface melting. We...