Results 41 to 50 of about 708,716 (215)

Advances in understanding subglacial meltwater drainage from past ice sheets

Annals of Glaciology, 2022
Meltwater drainage beneath ice sheets is a fundamental consideration for understanding ice–bed conditions and bed-modulated ice flow, with potential impacts on terminus behavior and ice-shelf mass balance.
Lauren M. Simkins, Sarah L. Greenwood, Monica C. M. Winsborrow, Lilja R. Bjarnadóttir, Allison P. Lepp   +4 more
doaj   +1 more source

Modeling the spatially distributed nature of subglacial sediment transport and erosion [PDF]

Earth Surface Dynamics, 2023
Abstract. Glaciers expel sediment as they melt, in addition to ice and water. As a result, changing glacier dynamics and melt produce changes to glacier erosion and sediment discharge, which can impact the landscape surrounding retreating glaciers, as well as communities and ecosystems downstream.
I. Delaney, L. Anderson, L. Anderson, F. Herman   +3 more
openaire   +3 more sources

The Periglacial Lake Bretjorna (Ledovoe), Western Svalbard: History of Formation and Recent Sedimentation

Лëд и снег, 2023
This paper presents the results of geomorphological, geochronological and lithological investigation of a young sedimentation basin – the periglacial Lake Bretjorna (Ledovoe).
N. I. Meshcheriakov, O. V. Kokin, I. S. Usyagina, N. E. Kasatkina   +3 more
doaj   +1 more source

Technologies for retrieving sediment cores in Antarctic subglacial settings [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2016
Accumulations of sediment beneath the Antarctic Ice Sheet contain a range of physical and chemical proxies with the potential to document changes in ice sheet history and to identify and characterize life in subglacial settings. Retrieving subglacial sediments and sediment cores presents several unique challenges to existing technologies.
Hodgson, Dominic A., Bentley, Michael J., Smith, James A., Klepacki, Julian, Makinson, Keith, Smith, Andrew M., Saw, Kevin, Scherer, Reed, Powell, Ross, Tulaczyk, Slawek, Rose, Mike, Pearce, David, Mowlem, Matt, Keen, Peter, Siegert, Martin J.   +14 more
openaire   +6 more sources

Subglacial sediment deformation in the Ross Sea, Antarctica

Quaternary Science Advances, 2021
Abstract:: The Ross Sea embayment is the outlet for one-third of all Antarctic ice flow, receiving input from both East and West Antarctica. Marine-based ice streams, whose stability is susceptible to global sea-level changes, expand and contract across the Ross Sea continental shelf, eroding and deforming the substrate and transporting sediment ...
Delaney E. Robinson, John Menzies, Julia S. Wellner, Rachel W. Clark   +3 more
openaire   +2 more sources

Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic

Frontiers in Marine Science, 2019
Meltwater discharge from tidewater glaciers impacts the adjacent marine environment. Due to the global warming, tidewater glaciers are retreating and will eventually terminate on land.
Laura Halbach, Laura Halbach, Mikko Vihtakari, Mikko Vihtakari, Pedro Duarte, Alistair Everett, Mats A. Granskog, Haakon Hop, Haakon Hop, Hanna M. Kauko, Svein Kristiansen, Per I. Myhre, Alexey K. Pavlov, Alexey K. Pavlov, Alexey K. Pavlov, Ankit Pramanik, Ankit Pramanik, Agnieszka Tatarek, Tomas Torsvik, Józef M. Wiktor, Anette Wold, Angela Wulff, Harald Steen, Philipp Assmy   +23 more
doaj   +1 more source

Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology

Journal of Glaciology, 2017
Ice-stream dynamics are strongly controlled by processes taking place at the ice/bed interface where subglacial water both lubricates the base and saturates any existing, underlying sediment. Large parts of the former Eurasian ice sheet were underlain by
EYTHOR GUDLAUGSSON, ANGELIKA HUMBERT, KARIN ANDREASSEN, CAROLINE C. CLASON, THOMAS KLEINER, SEBASTIAN BEYER   +5 more
doaj   +1 more source

Dilation of subglacial sediment governs incipient surge motion in glaciers with deformable beds

Proceedings of the Royal Society A, 2020
Glacier surges are quasi-periodic episodes of rapid ice flow that arise from increases in slip rate at the ice–bed interface. The mechanisms that trigger and sustain surges are not well understood.
B. Minchew, C. Meyer
semanticscholar   +1 more source

Glacial Erosion Liberates Lithologic Energy Sources for Microbes and Acidity for Chemical Weathering Beneath Glaciers and Ice Sheets

Frontiers in Earth Science, 2018
Wet-based regions of glaciers and ice sheets are now recognized to host unique and diverse microbial communities capable of influencing global biogeochemical cycles.
Moya L. Macdonald, Jemma L. Wadham, Jon Telling, Mark L. Skidmore   +3 more
doaj   +1 more source

Subglacial sediments as a control on the onset and location of two Siple Coast ice streams, West Antarctica

, 2006
Laterally continuous subglacial sediments are a necessary component for ice streaming in the modern onset regions of the ice streams draining the Siple Coast of West Antarctica on the basis of new seismic data combined with previous results.
L. E. Peters, S. Anandakrishnan, R. Alley, J. P. Winberry, D. Voigt, Andrew M. Smith, David L. Morse   +6 more
semanticscholar   +1 more source