Results 11 to 20 of about 12,531 (254)

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, Terrence Blackburn, Bernard Hallet, Matthew A. Coble, Emily E. Brodsky   +4 more
doaj   +3 more sources

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 ...
Jane Hart
exaly   +6 more sources

Subglacial drainage processes at a High Arctic polythermal valley glacier [PDF]

Journal of Glaciology, 2005
AbstractDye-tracer experiments undertaken over two summer melt seasons at polythermal John Evans Glacier, Ellesmere Island, Canada, were designed to investigate the character of the subglacial drainage system and its evolution over a melt season. In both summers, dye injections were conducted at several moulins and traced to a single subglacial outflow.
Bingham, Robert George, Nienow, Peter W., Sharp, Martin J., Boon, Sarah   +3 more
core   +7 more sources

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, Jon Telling, Martyn Tranter, Mark Skidmore, Brent Christner, Simon O’Doherty, John Priscu   +6 more
openaire   +5 more sources

Subglacial processes, deposits and landforms—introduction

Boreas
Jan A. Piotrowski, Tracy A. Brennand, Christopher D. Clark, Wojciech Wysota   +3 more
doaj   +4 more sources

Estimating effective pressures in active subglacial lakes with ICESat-2 satellite altimetry [PDF]

Journal of Glaciology
The 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, Aleah Nicholson Sommers, Colin Meyer, Lauren Cristy Andrews   +3 more
doaj   +2 more sources

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
openaire   +3 more sources

Subglacial tills: a process model based on microsedimentological clues [PDF]

Journal of Sedimentary Research, 2023
Abstract Subglacial sediments are subject to erosion, transport, and deposition in active, ephemeral, and spatially localized glacial environments. It is critical to determine how these mobilized sediments become immobilized in a time-transgressive process and can be frequently remobilized and reimmobilized.
John Menzies, Roger C. Paulen, Jürgen M. Reitner, Cunhai Gao, Tyler Hodder, Martin Ross   +5 more
openaire   +2 more sources

Isotopic identification of subglacial processes

, 1986
A comprehensive stable isotope study of basal ice and debris layers in two Yukon surging glaciers suggests an isotopically variable basal freezing cycle. Trapridge and Backe Glaciers, St. Elias Range, Yukon, Canada, have parallel basal debris layers that extend for hundreds of metres along marginal ice faces and in meltwater tunnels.
Michael Maxwell
openaire   +3 more sources

Seasonal velocity patterns provide insights for the soft-bed subglacial hydrology continuum [PDF]

Communications Earth & Environment
Subglacial hydrology plays an important role in controlling glacier behaviour, influencing glacier retreat and the resulting contributions to sea level rise.
Jane K. Hart, Nathaniel R. Baurley, Amy Bonnie, Benjamin A. Robson, Graeme Bragg, Kirk Martinez   +5 more
doaj   +2 more sources