Results 51 to 60 of about 832 (174)

Dynamic subglacial meltwater history archived in Antarctic subglacial lake sediments

Geological Society of America Bulletin
Abstract There is a paucity of records on decadal to millennial scales archiving the evolution of the Antarctic subglacial hydrologic system, leaving a gap in our knowledge of the links between meltwater drainage and ice behavior. We employed a suite of sedimentological and geochemical methods to assess the stratigraphic distribution of ...
Timothy D. Campbell, Mark L. Skidmore, Molly O. Patterson, John E. Dore, David M. Harwood, Amy Leventer, Alexander B. Michaud, Brad E. Rosenheim, Matthew R. Siegfried, August J. Steigmeyer, Martyn Tranter, Ryan A. Venturelli, John C. Priscu   +12 more
openaire   +2 more sources

Subglacial bed form morphology controlled by ice speed and sediment thickness [PDF]

Geophysical Research Letters, 2016
AbstractSubglacial bed forms (drumlins, ribbed moraines, and megascale glacial lineations) are enigmatic repetitive flow‐parallel and flow‐transverse landforms common in glaciated landscapes. Their evolution and morphology are a potentially powerful constraint for ice sheet modeling, but there is little consensus on bed form dynamics or formative ...
Barchyn, T.E., Dowling, T.P.F., Stokes, C.R., Hugenholtz, C.G.   +3 more
openaire   +4 more sources

A new methodology to simulate subglacial deformation of water-saturated granular material [PDF]

The Cryosphere, 2015
The dynamics of glaciers are to a large degree governed by processes operating at the ice–bed interface, and one of the primary mechanisms of glacier flow over soft unconsolidated sediments is subglacial deformation.
A. Damsgaard, D. L. Egholm, J. A. Piotrowski, S. Tulaczyk, N. K. Larsen, C. F. Brædstrup   +5 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

Environmental dynamics and timing of the late Eemian interglacial to the Weichselian pleniglacial at Lichtenberg, Germany: implications for the Oerel and Glinde interstadials

Boreas, EarlyView.
The terrestrial sediment archives of northern Germany provide important insights into Late Pleistocene climate variability, but continuous and well‐dated records remain rare. In particular, the age and stratigraphic position of the Oerel and Glinde interstadials within the Early Weichselian to pleniglacial transition remain poorly constrained.
Alexis Badai Samudra, Michael Hein, Martin Theuerkauf, Neda Rahimzadeh, Marcel Weiss, David Colin Tanner, Brigitte Urban   +6 more
wiley   +1 more source

Early to Mid‐Holocene molluscan community dynamics in Billefjorden, central Svalbard: the interplay of local geomorphology and regional climate

Boreas, EarlyView.
The postglacial evolution of High Arctic coastal environments is recorded in the rich fossiliferous archives of raised marine terraces. This study employs a multi‐proxy approach combining molluscan community analysis, taphonomy and sedimentology to reconstruct the Early to Mid‐Holocene environmental dynamics of the Mimerdalen embayment in the ...
Martin Lulák, Martin Hanáček, Slavomír Nehyba, Tomáš Weiner, Daniel Nývlt   +4 more
wiley   +1 more source

The last glacial cycle in western Norway—extensive MIS 5d glaciation, multiple glacial advances and LGM glacial advance phases

Boreas, EarlyView.
Raised marine MIS 5c sediments evidence extensive preceding (5d) glaciation in western Norway. This is the first out of five (or six) major Weichselian glacier advances that seem to correspond to North Atlantic sea surface cooling periods. Till beds capping the marine sediments show stages of pre‐LGM advance and subsequent retreat.
Eiliv Larsen, Hans Petter Sejrup, Brent Ward, William E. N. Austin, Hilary H. Birks, Oddvar Longva, Astrid Lyså, Dag Ottesen, Bente Philippsen, Martin Seiler   +9 more
wiley   +1 more source

Lead isotope evidence for Antarctic Ice Sheet changes in the Weddell Sea sector since the Last Glacial Maximum

Boreas, EarlyView.
The Weddell Sea influences global ocean circulation and sea level through modulating Antarctic Bottom Water formation and Antarctic Ice Sheet discharges, but the history of ice‐sheet dynamics in this region remains poorly constrained due to limited well‐dated geological records.
Huang Huang, Yuanyang Hu, Marcus Gutjahr, Florian Kirsch, Lijuan Lu, Jianjun Zou, Xuefa Shi, Michael Bollen, Jimin Yu, Gerhard Kuhn   +9 more
wiley   +1 more source

Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica

Antarctic Record, 2000
Outcrops bearing clayish stratified sediments at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica (named "Richardson Clay" by M. Hayashi, Proc. NIPR Symp. Antarct.
Kazuomi Hirakawa, Takanobu Sawagaki
doaj   +1 more source

Adaptation to extreme environments: A review of Antarctic fish physiology

Journal of Fish Biology, EarlyView.
Abstract Having evolved in the chronically cold and thermally stable waters of the Southern Ocean (SO) for millions of years, Antarctic fish possess a suite of physiological specializations that enable them to survive at temperatures near the freezing point of seawater. Adaptations include the evolution of antifreeze proteins, modifications of membrane
Seungyeon Lee, Sachithra Amarin Hettiarachchi, Il‐Chan Kim, Jae‐Seong Lee, Thomas Desvignes, Julia M. York, Laura Ghigliotti, Jilda Alicia Caccavo, Jin‐Hyoung Kim   +8 more
wiley   +1 more source