Siliceous subglacial deposits: archives of subglacial processes during the Last Glacial Maximum [PDF]
Journal of Glaciology, 2021 We report detailed chemical and isotopic data from a subglacial siliceous deposit on andesitic bedrock recently exposed by glacier retreat. Whereas a single,
Shalev Siman-Tov +4 more
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Differential impact of isolated topographic bumps on ice sheet flow and subglacial processes [PDF]
The Cryosphere, 2023 Topographic highs (“bumps”) across glaciated landscapes have the potential to temporarily slow ice sheet flow or, conversely, accelerate ice flow through subglacial strain heating and meltwater production.
M. A. McKenzie +5 more
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Subglacial processes, deposits and landforms—introduction
BoreasJan A. Piotrowski +3 more
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Subglacial erosion has the potential to sustain microbial processes in Subglacial Lake Whillans, Antarctica [PDF]
Communications Earth & Environment, 2021 AbstractSubglacial Lake Whillans lies below around 800 m of Antarctic ice and is isolated from fresh sources of photosynthetic organic matter to sustain life. The diverse microbial ecosystems within the lake and underlying sediments are therefore dependent on a combination of relict, overridden, marine-derived organic matter and mineral-derived energy.
Beatriz Gill-Olivas +6 more
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Constraining subglacial processes from surface velocity observations using surrogate-based Bayesian inference [PDF]
Journal of Glaciology, 2021 AbstractBasal motion is the primary mechanism for ice flux in Greenland, yet a widely applicable model for predicting it remains elusive. This is due to the difficulty in both observing small-scale bed properties and predicting a time-varying water pressure on which basal motion putatively depends.
Douglas Brinkerhoff +2 more
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Illuminating Active Subglacial Lake Processes With ICESat‐2 Laser Altimetry [PDF]
Geophysical Research Letters, 2021 AbstractAntarctica's basal water system contains more than 130 active lakes, and its evolution remains a major uncertainty in future ice sheet dynamics. Most of our current understanding has come from using satellite radar and laser altimetry acquired since 2003. NASA's ICESat‐2 laser altimetry mission, launched in September 2018, provides a new, small‐
M. R. Siegfried, H. A. Fricker
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Estimating effective pressures in active subglacial lakes with ICESat-2 satellite altimetry [PDF]
Journal of GlaciologyThe difference between the ice and water pressures, or the effective pressure, influences water flow and sliding at the ice-bed interface. Effective pressure is typically quantified with subglacial hydrology models because direct measurements of the ...
Aaron Stubblefield +3 more
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Subglacial Processes at Bondhusbreen, Norway: Preliminary Results [PDF]
Annals of Glaciology, 1983 Subglacial hydrology, sediment transport, pressure, and temperature have been studied beneath approximately 160 m of ice at Sondhusbreen, an outlet glacier from Folgefonni in south-western Norway.The volume of the mean annual water discharge passing through the study area is about 60x106m3.
Jon Ove Hagen +4 more
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Subglacial till formation: Microscale processes within the subglacial shear zone
Quaternary Science Reviews, 2017 Abstract This was a study of subglacial deformation till genesis from a modern temperate glacier, at Skalafellsjokull, Iceland. Detailed microscale properties of till samples (from Scanning Electron Microscope [SEM] and thin section analysis) were examined from a glacial site with in situ subglacial process monitoring and an exposed subglacial ...
J. Hart
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Seasonal velocity patterns provide insights for the soft-bed subglacial hydrology continuum [PDF]
Communications Earth & EnvironmentSubglacial hydrology plays an important role in controlling glacier behaviour, influencing glacier retreat and the resulting contributions to sea level rise.
Jane K. Hart +5 more
doaj +2 more sources