Results 61 to 70 of about 5,150,866 (206)

Characterization of glacial silt and clay using automated mineralogy

Annals of Glaciology, 2019
Glacial erosion produces vast quantities of fine-grained sediment that has a far-reaching impact on Earth surface processes. To gain a better understanding of the production of glacial silt and clay, we use automated mineralogy to quantify the ...
Jeff W. Crompton, Gwenn E. Flowers, Brendan Dyck   +2 more
doaj   +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

Lodge moraines: a common yet underreported end‐moraine type—a review

Boreas, EarlyView.
Lodge moraines are a distinct genetic type of end moraine formed by submarginal accretion of subglacial till; they are some of the largest end moraines in the world. Although underreported in the literature, they are of equal importance to push, dump and hummocky end moraines. End moraines are formed at glacier ice margins and show the extent of former
Mark D. Johnson, Jose Luis Antinao, Ívar Örn Benediktsson, David A. Grimley, Carrie E. Jennings, Henry M. Loope, Tom V. Lowell, David M. Mickelson, Peter L. Moore, Thomas A. Nash, J. Elmo Rawling III, Jamey Stutz   +11 more
wiley   +1 more source

Influence of increasing surface melt over decadal timescales on land-terminating Greenland-type outlet glaciers

Journal of Glaciology, 2018
Over recent decades, Greenland ice sheet surface melt has shown an increase both in intensity and spatial extent. Part of this water probably reaches the bed and can enhance glacier speed, advecting a larger volume of ice into the ablation area.
OLIVIER GAGLIARDINI, MAURO A. WERDER
doaj   +1 more source

LGM glaciation in the northern Dinaric Mountains, Slovenia: new insights from terrestrial cosmogenic nuclide dating and Parallel Ice Sheet Model simulation

Boreas, EarlyView.
The Dinaric Mountains are a mountain range stretching NW–SE from the Alps to the Albanides–Hellenides in central Europe. The highest parts were occupied by small ice fields and/or valley glaciers during the Quaternary cold periods, while even today some small glaciers still exist in topoclimatically favourable areas.
Manja Žebre, M. Akif Sarikaya, Matjaž Depolli, Uroš Stepišnik, Attila Çiner, Gregor Kosec, Klaus Wilcken, Cengiz Yildirim   +7 more
wiley   +1 more source

The Devil Lake pothole (Ontario): Evidence of subglacial fluvial processes [PDF]

Géographie physique et Quaternaire, 2002
A pothole 1.93 m deep and 1.3 m maximum diameter is located near the crest of a ridge that forms one arm of an eroded anticline in para-gneiss of the Precambrian Shield in southeastern Ontario. It's position on high ground in a region of more than 100 m relief on the bed rock precludes its formation by modern subaerial stream flow or by streams that ...
openaire   +1 more source

Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica [PDF]

Geology, 2016
Subglacial Lake Whillans (SLW), West Antarctica, located beneath 800 m of ice is an active component of the subglacial hydrological network. The fill and drain behavior of SLW leads to long (years - decades) water residence times. Here, we present the aqueous geochemistry of the SLW water column and porewaters from a 36 cm sediment core.
Alexander B Michaud, Mark L Skidmore, Andrew C Mitchell, Trista J VickMajors, Carlo Barbante, Clara Turetta, Will vanGelder, John C Priscu   +7 more
openaire   +3 more sources

Subglacial Lake Ellsworth: a candidate for in situ exploration in West Antarctica [PDF]

, 2004
Radio-echo sounding reveals a 10 km-long lake beneath similar to3.4 km of ice near the Ellsworth Mountains in West Antarctica, 20 km from the ice divide. Subglacial Lake Ellsworth is located within a distinct topographic hollow, which is similar to1.5 km
Corr, H., Woodward, J., Payne, AJ, Joughin, I., King, Edward, Smith, Andrew, Siegert, MJ, King, E. C., Smith, A., Siegert, Martin J., Woodward, J, Hindmarsh, RCA, Corr, Hugh, Woodward, John, King, E, Payne, Antony J., Corr, H, King, Edward C., Payne, A. J., Hindmarsh, Richard, Joughin, Ian, Siegert, Martin, Siegert, M. J., Joughin, I, Smith, Andy, Smith, AM, Hindmarsh, R.   +26 more
core   +1 more source

Characterization of seismicity from different glacial bed types: machine learning classification of laboratory stick-slip acoustic emissions

Annals of Glaciology
Subglacial seismicity presents the opportunity to monitor inaccessible glacial beds at the epicentral location and time. Glaciers can be underlain by rock or till, a first order control on bed mechanics.
Seth Saltiel, Nathan Groebner, Theresa Sawi, Christine McCarthy   +3 more
doaj   +1 more source

Modeling saline-fluid flow through subglacial channels [PDF]

The Cryosphere
Subglacial hydrological systems impact ice dynamics, biological environments, and sediment transport. Previous numerical models of channelized subglacial flow have focused on freshwater in temperate ice without considering variable fluid chemistry and ...
A. Jenson, A. Jenson, M. Skidmore, L. Beem, M. Truffer, S. McCalla   +5 more
doaj   +1 more source