Results 31 to 40 of about 708,716 (215)

Subglacial erosion has the potential to sustain microbial processes in Subglacial Lake Whillans, Antarctica

Communications Earth & Environment, 2021
Subglacial 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 ...
B. Gill-Olivas, J. Telling, M. Tranter, M. Skidmore, B. Christner, S. O'Doherty, J. Priscu   +6 more
semanticscholar   +1 more source

A subglacial hydrologic drainage hypothesis for silt sorting and deposition during retreat in Pine Island Bay

Annals of Glaciology, 2019
Late Holocene sediment deposits in Pine Island Bay, West Antarctica, are hypothesized to be linked to intensive meltwater drainage during the retreat of the paleo-Pine Island Ice Stream after the Last Glacial Maximum. The uppermost sediment units show an
Dustin M. Schroeder, Emma J. MacKie, Timothy T. Creyts, John B. Anderson   +3 more
doaj   +1 more source

Viable cold-tolerant iron-reducing microorganisms in geographically diverse subglacial environments [PDF]

Biogeosciences, 2017
Subglacial environments are known to harbour metabolically diverse microbial communities. These microbial communities drive chemical weathering of underlying bedrock and influence the geochemistry of glacial meltwater.
S. L. Nixon, J. P. Telling, J. L. Wadham, C. S. Cockell   +3 more
doaj   +1 more source

Warm-based basal sediment entrainment and far-field Pleistocene origin evidenced in central Transantarctic blue ice through stable isotopes and internal structures

Journal of Glaciology, 2018
Stable isotopes of water (δ18O and δ2H) were measured in the debris-laden ice underlying an Antarctic blue ice moraine, and in adjoining Law Glacier in the central Transantarctic Mountains.
JOSEPH A. GRALY, KATHY J. LICHT, CHRISTINE M. KASSAB, BROXTON W. BIRD, MICHAEL R. KAPLAN   +4 more
doaj   +1 more source

ANTASed – An Updated Sediment Model for Antarctica

Frontiers in Earth Science, 2021
We compile existing seismic, gravity, radar and magnetic data, together with the subglacial bedrock relief from the BEDMACHINE project, to build the most detailed sediment model for Antarctica.
A. Baranov, A. Morelli, A. Chuvaev
doaj   +1 more source

Radar sounding survey over Devon Ice Cap indicates the potential for a diverse hypersaline subglacial hydrological environment

The Cryosphere, 2021
. Prior geophysical surveys provided evidence for a hypersaline subglacial lake complex beneath the center of Devon Ice Cap, Canadian Arctic; however, the full extent and characteristics of the hydrological system remained unknown due to limited data ...
A. Rutishauser, D. Blankenship, D. Young, N. Wolfenbarger, L. Beem, M. Skidmore, A. Dubnick, A. Criscitiello   +7 more
semanticscholar   +1 more source

A new percussion hammer mechanism for a borehole deployable subglacial sediment corer

Annals of Glaciology, 2021
Subglacial sediments have the potential to reveal information about the controls on glacier flow, changes in ice-sheet history and characterise life in those environments.
Keith Makinson, Daniel Ashurst, Paul G. D. Anker, James A. Smith, Dominic A. Hodgson, Peter E. D. Davis, Andrew M. Smith   +6 more
doaj   +1 more source

Sedimentology and internal structure of murtoos - V-shaped landforms indicative of a dynamic subglacial hydrological system

, 2021
Knowledge about processes beneath ice sheets, and in particular the processes connected to subglacial hydrology, is crucial for an understanding of ice sheets and how they react in a warming climate. Recently, v-shaped subglacial landforms (murtoos) have
Gustaf Peterson Becher, Mark D. Johnson
semanticscholar   +1 more source

Deformation ‘boundary front’ movements in subglacial tills—A microsedimentological perspective from till sequences near Pine Point, NWT, Canada

The Depositional Record, 2019
Investigations of glacial sediment exposures in a former open pit in the Pine Point Mining District, Northwest Territories, reveal evidence of changes in stress magnitude as exhibited by the movement of deformation ‘fronts’ within subglacial tills, as ...
John Menzies, Roger C. Paulen, Jessey M. Rice, M. Beth McClenaghan, Natasha M. Oviatt, Nitasha Dhillon   +5 more
doaj   +1 more source

Subglacial sediment distribution from constrained seismic inversion, using MuLTI software: examples from Midtdalsbreen, Norway

Annals of Glaciology, 2019
Fast ice flow is associated with the deformation of subglacial sediment. Seismic shear velocities, Vs, increase with the rigidity of material and hence can be used to distinguish soft sediment from hard bedrock substrates.
Siobhan F. Killingbeck, Adam D. Booth, Philip W. Livermore, Landis J. West, Benedict T. I. Reinardy, Atle Nesje   +5 more
doaj   +1 more source