Results 51 to 60 of about 2,018 (207)

Radar-derived bed roughness characterization of Institute and Möller ice streams, West Antarctica, and comparison with Siple Coast ice streams [PDF]

, 2007
Subglacial bed conditions exert a significant control on ice stream behavior and evolution, and can be characterized by determining bed roughness from FFT analysis of radar-imaged basal reflectors. Here we assess bed roughness across Institute and Moller
Siegert, Martin J., Bingham, Robert G.
core   +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

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

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

Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada

Boreas
Thorncliffe Formation (southern Ontario, Canada) sedimentary architecture, extent, facies trends, contacts and composition, combined with hydraulic data, define fundamental glacial basin depositional environments. Thorncliffe Formation (TF) comprises an ~
David R. Sharpe, Charles E. Logan, Ross D. Knight, Andre J.‐M. Pugin   +3 more
doaj   +1 more source

Geochronological reconstruction of the Lateglacial deglaciation in the Arve Valley (Northern French Alps)

Journal of Quaternary Science, EarlyView.
ABSTRACT The timing and spatial patterns of glaciers retreat in the Northern French Alps during the Lateglacial (19.0–11.7 ka) remain debated, reflecting discrepancies among available chronological data sets. The complex interactions between major glaciers, such as the Rhône and Arve glaciers to the north and the Isère glacier to the south, represent a
Quentin Portal, Christian Crouzet, Jean‐François Buoncristiani, Julien Carcaillet   +3 more
wiley   +1 more source

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

, 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 ...
Christner, Brent, Skidmore, Mark, Telling, Jon, Gill-Olivas, Beatriz, Tranter, Martyn, Priscu, John, O'Doherty, Simon   +6 more
core   +1 more source

The Causes and Implications of Microstructures in Glacial Sediments [PDF]

, 1998
This thesis examines how microstructures in glaciogenic sediments reflect the processes forming them, and how these microstructures then affect the conditions around them, through a series of field studies, laboratory tests, models, and statistical ...
Evans, Andrew John, Evans, A.J.
core  

Quantifying the Surface Deformation of Pingos on the Alaskan North Slope Using Interferometric Synthetic Aperture Radar (InSAR)

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Pingos are large mounds with cores formed of intrusive ice that form in periglacial landscapes. These ice structures can form in regions of discontinuous permafrost, commonly as hydraulic or open‐system pingos, or in locations of continuous permafrost, commonly as hydrostatic or closed‐system pingos.
Venezia M. Follingstad, Roger J. Michaelides, Matthew R. Siegfried, Tyler M. Meng, John Bradford, Kynan H. G. Hughson, Alexia R. Kubas, Andrew Mullen, Enrica Quartini, Austin Routt, Hanna G. Sizemore, Andrei Swidinsky, Britney E. Schmidt   +12 more
wiley   +1 more source

Were the Larsemann Hills ice-free through the last Glacial Maximum? [PDF]

, 2001
Lake sediments in the Larsemann Hills contain a great diversity of biological and physical markers from which past environments can be inferred. In order to determine the timing of environmental changes it is essential to have accurate dating of ...
Noon, P.E., Verleyen, E., Gore, D. B., Noon, P. E., Bryant, C.L., Sabbe, K, Ellis-Evans, JC, Wood, P. B., Noon, PE, Appleby, P., Vyverman, W, Gilmour, M, Bryant, C. L., Gore, D.B., Jones, V.J., Appleby, P, Hodgson, D.A., Gore, DB, Hodgson, D. A., Bryant, CL, Verleyen, Elie, Jones, VJ, Sabbe, Koen, Wood, PB, Vyverman, Wim, Sabbe, K., Ellis-Evans, J. C., Hodgson, DA, Vyverman, W., Jones, V. J., Wood, P.B., Verleyen, E, Gilmour, M., Ellis-Evans, J.C.   +33 more
core   +1 more source