Results 41 to 50 of about 5,150,866 (206)

The Effect of Subglacial Chemical Processes on Glacier Sliding [PDF]

Journal of Glaciology, 1976
Abstract The glacier sliding theory of Nye is modified to include the effect of solutes in subglacial regelation waters on the sliding process. Motivation for this development stems from studies of subglacially formed chemical deposits that appear to be widespread on rock surfaces recently exposed by retreating temperate glaciers.
openaire   +1 more source

Seismic characterization of a rapidly-rising jökulhlaup cycle at the A.P. Olsen Ice Cap, NE-Greenland

Journal of Glaciology, 2020
Rapidly-rising jökulhlaups, or glacial outburst floods, are a phenomenon with a high potential for damage. The initiation and propagation processes of a rapidly-rising jökulhlaup are still not fully understood.
Michael Behm, Jacob I. Walter, Daniel Binder, Feng Cheng, Michele Citterio, Bernd Kulessa, Kirsty Langley, Phillipe Limpach, Stefan Mertl, Wolfgang Schöner, Mikkel Tamstorf, Gernot Weyss   +11 more
doaj   +1 more source

Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set

Journal of Glaciology, 2023
The dynamics of the Greenland Ice Sheet are affected by surface meltwater reaching the base of the ice, altering ice contact with the bedrock. Lack of understanding of this evolution hampers the ability to predict the effects of increasing temperatures ...
Signe H. Larsen, Andreas P. Ahlstrøm, Nanna B. Karlsson, Anders Kusk, Peter L. Langen, Christine S. Hvidberg   +5 more
doaj   +1 more source

Enthalpy balance theory unifies diverse glacier surge behaviour

Annals of Glaciology, 2022
It is commonly asserted that there are two distinct classes of glacier surges: slow, long-duration ‘Svalbard-type’ surges, triggered by a transition from cold- to warm-based conditions (thermal switching), and fast, shorter-duration ‘Alaska-type’ surges ...
Douglas I. Benn, Ian J. Hewitt, Adrian J. Luckman   +2 more
doaj   +1 more source

Refinement of the Quaternary seismic stratigraphy and analysis of buried glacial channels on the Labrador Shelf

Journal of Quaternary Science, EarlyView.
ABSTRACT The Laurentide Ice Sheet covered vast areas of North America during the Wisconsinan, including the Labrador Shelf, off the coast of eastern Canada. The shelf is characterized by glacial cross‐shelf troughs, which have been considered as predominantly eroded by the last ice advance.
Kai‐Frederik Lenz, Felix Gross, A. Catalina Gebhardt, Arne Lohrberg, Ralph Schneider, Henriette Kolling, Florian Riefstahl, Orlando Martinez Bautista, Viktoria Thamm, Sebastian Krastel   +9 more
wiley   +1 more source

Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation [PDF]

Geofluids, 2017
The specific impact of glacial processes on groundwater flow and solute transport under ice-sheets was determined by means of numerical simulations. Groundwater flow and the transport of δ18O, TDS, and groundwater age were simulated in a generic sedimentary basin during a single glacial event followed by a postglacial period.
Arnaud Sterckx, Jean-Michel Lemieux, Rein Vaikmäe   +2 more
openaire   +2 more sources

Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities [PDF]

The Cryosphere, 2017
Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches.
P. How, P. How, D. I. Benn, N. R. J. Hulton, N. R. J. Hulton, B. Hubbard, A. Luckman, A. Luckman, H. Sevestre, W. J. J. van Pelt, K. Lindbäck, J. Kohler, W. Boot   +12 more
doaj   +1 more source

Holocene vegetation dynamics of Grande Terre (Kerguelen Islands) inferred from sedimentary ancient DNA

Journal of Quaternary Science, EarlyView.
ABSTRACT While the Antarctic region has experienced significant climatic changes over the Holocene, few high‐resolution records have examined their effects on the local biota. In order to understand past ecological shifts and forecast future changes, it is important to obtain high‐resolution palaeoecological records from this region.
Xaali O'Reilly‐Berkeley, Aloïs Revéret, Youri Lammers, Maaike Zwier, Anne E. Bjune, Fabien Arnaud, Jostein Bakke, Sandra Nogué, Inger G. Alsos   +8 more
wiley   +1 more source

Inferring forms of glacier slip laws from estimates of ice-bed separation during glacier slip

Journal of Glaciology, 2023
Sea-level projections depend sensitively on the parameterization used for basal slip in glacier flow models. During slip over rock-beds, ice-bed separation increases with slip velocity and basal water pressure.
Jacob B. Woodard, Lucas K. Zoet, Neal R. Iverson, Christian Helanow   +3 more
doaj   +1 more source

New Schmidt hammer exposure‐age dating calibrations for the Last Glacial Termination in NW Scotland: Development and application to undated Torridon Group sandstone surfaces in Wester Ross

Journal of Quaternary Science, EarlyView.
ABSTRACT An understanding of the terrestrial extent, retreat dynamics and climate–glacier coupling of ice masses during the Last Glacial Termination (LGT, ~18–11 ka) is often limited by a fragmentary geomorphological record and is dependent on precise, accurate and robust dating frameworks.
Alastair M. Curry, David Small, Oliver T. Bartlett, Jonathan Newitt   +3 more
wiley   +1 more source