Results 71 to 80 of about 2,075 (207)

Deep Clustering in Radar Subglacial Reflector Reveals New Subglacial Lakes

, 2023
Abstract. Ice-penetrating radar (IPR) imaging is a valuable tool for observing the internal structure and bottom of ice sheets. Subglacial water bodies, also known as subglacial lakes, generally appear as distinct, bright, flat, and continuous reflections in IPR images.
Sheng Dong, Lei Fu, Xueyuan Tang, Zefeng Li, Xiaofei Chen   +4 more
openaire   +2 more sources

Dynamic Boundaries of Antarctic Active Subglacial Lakes Reveal Underestimated Water Volume Change and Overestimated Lakebed Active Area

Geophysical Research Letters
This study revisited 158 documented active subglacial lakes across Antarctica, applying a height‐change anomaly delineation algorithm to CryoSat‐2 and ICESat‐2 satellite altimetry data to assemble a 14.75‐year (2010.5–2025.25) time series of active ...
W. Sauthoff, M. R. Siegfried, R. A. Venturelli, B. E. Smith   +3 more
doaj   +1 more source

The influence of a model subglacial lake on ice dynamics and internal layering [PDF]

The Cryosphere, 2016
As ice flows over a subglacial lake, the drop in bed resistance leads to an increase in ice velocities and a draw down of isochrones and cold ice. The ice surface flattens as it adjusts to the lack of resisting forces at the base. The rapid transition in
E. Gudlaugsson, A. Humbert, T. Kleiner, J. Kohler, K. Andreassen   +4 more
doaj   +1 more source

Weichselian history of the Fennoscandian Ice Sheet centre, Kvarken archipelago, western Finland—flow shifts, thermal regime and deglaciation

Boreas, EarlyView.
Rapid thaw of the Earth's cryosphere in response to anthropogenic warming highlights the need to identify and understand the contrasting signatures of past ice‐sheet stability and collapse. The Kvarken archipelago, western Finland, at the centre of the former Fennoscandian Ice Sheet (FIS), has been designated a UNESCO World Heritage site in recognition
Niko Putkinen, Tapani Tervo, Adrian M. Hall, Juha P. Lunkka, Pertti Sarala, Olli Breilin, Jari Nenonen   +6 more
wiley   +1 more source

Scientific access into Mercer Subglacial Lake: scientific objectives, drilling operations and initial observations

Annals of Glaciology, 2021
The Subglacial Antarctic Lakes Scientific Access (SALSA) Project accessed Mercer Subglacial Lake using environmentally clean hot-water drilling to examine interactions among ice, water, sediment, rock, microbes and carbon reservoirs within the lake water
John C. Priscu, Jonas Kalin, John Winans, Timothy Campbell, Matthew R. Siegfried, Mark Skidmore, John E. Dore, Amy Leventer, David M. Harwood, Dennis Duling, Robert Zook, Justin Burnett, Dar Gibson, Edward Krula, Anatoly Mironov, Jim McManis, Graham Roberts, Brad E. Rosenheim, Brent C. Christner, Kathy Kasic, Helen A. Fricker, W. Berry Lyons, Joel Barker, Mark Bowling, Billy Collins, Christina Davis, Al Gagnon, Christopher Gardner, Chloe Gustafson, Ok-Sun Kim, Wei Li, Alex Michaud, Molly O. Patterson, Martyn Tranter, Ryan Venturelli, Trista Vick-Majors, Cooper Elsworth   +36 more
doaj   +1 more source

Changing climates and environments within the complex Middle to Late Pleistocene fill of an overdeepened valley at Niederweningen, Switzerland

Boreas, EarlyView.
Glacially overdeepened valleys in the northern Alpine Foreland preserve Middle to Late Pleistocene sedimentary sequences that may serve as valuable archives for reconstructing past environmental changes in response to shifts in climate. This study presents a multidisciplinary analysis of two sediment cores from the overdeepened Wehntal Valley at ...
Johannes M. Miocic, Nigel Thew, Ruth Drescher‐Schneider, Hans Rudolf Graf, Marlu Kühn, Frank Preusser, Werner H. Schoch, Lucia Wick, Heinz Furrer   +8 more
wiley   +1 more source

Towards an ‘absolute’ timing of biostratigraphic and environmental phases from the Saalian late glacial to the Weichselian pleniglacial in central Europe—Insights from a lacustrine succession in Lichtenberg, northern Germany

Boreas, EarlyView.
Palynological records are central to the biostratigraphic subdivision of the Late Pleistocene in central Europe. Yet many interglacial and interstadial phases—such as the Eemian, Brörup and Odderade—remain only poorly constrained in time due to limited numerical dating.
Michael Hein, Thomas Kasper, Alexis Badai Samudra, Martin Theuerkauf, Markus Lothar Fischer, Neda Rahimzadeh, Maria Sekar Proborukmi, Sonja Rigterink, Agnieszka Gruszczyńska, Christian Zeeden, Simon Parfitt, David John Horne, Lucy Roberts, Dustin White, Lisa Brogmus, Hans von Suchodoletz, Tobias Lauer, Marcel Weiss, David Colin Tanner, Brigitte Urban   +19 more
wiley   +1 more source

Greenland subglacial lakes detected by radar [PDF]

Geophysical Research Letters, 2013
AbstractSubglacial lakes are an established and important component of the basal hydrological system of the Antarctic ice sheets, but none have been reported from Greenland. Here we present airborne radio echo sounder (RES) measurements that provide the first clear evidence for the existence of subglacial lakes in Greenland.
Palmer, SJ, Dowdeswell, JA, Christoffersen, P, Young, DA, Blankenship, DD, Greenbaum, JS, Benham, T, Bamber, J, Siegert, MJ   +8 more
openaire   +2 more sources

Repeated subglacial jökulhlaups in northeastern Greenland revealed by CryoSat

Journal of Glaciology
Surface height changes above three previously undetected subglacial lakes in northeastern Greenland are documented using CryoSat, DEMs and ICESat-2. Between 7 February and 6 March 2012, the central ice region (22.6 km2) above the largest lake dropped by ~
Laurence Gray, David Burgess, Luke Copland, Christine Dow, Xavier Fettweis, David Fisher, Will Kochtitzky, Wesley van Wychen, James Zheng   +8 more
doaj   +1 more source

Seasonal Ice Dynamics Control the Timing of Crevasse Drainage at a Fast‐Flowing Outlet Glacier

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Crevasse field drainage transfers at least half of the seasonal runoff from the surface to the bed of the Greenland Ice Sheet, but the patterns of drainage are complex and spatio‐temporally heterogenous. To better understand controls on crevasse drainage processes, we use an automated deep learning method to map the seasonal filling and ...
T. R. Chudley, C. R. Stokes, J. M. Lea, T. Winterbottom, R. Law, C. C. Clason, H. E. Wytiahlowsky, J. L. Dechow   +7 more
wiley   +1 more source