Results 41 to 50 of about 471,781 (349)

Ice flow dynamics of the northwestern Laurentide Ice Sheet during the last deglaciation [PDF]

The Cryosphere
Reconstructions of palaeo-ice-stream activity provide insight into the processes governing ice stream evolution over millennial timescales. The northwestern sector of the Laurentide Ice Sheet experienced a period of rapid retreat driven by warming during
B. J. Stoker, H. E. Dulfer, H. E. Dulfer, C. R. Stokes, V. H. Brown, V. H. Brown, C. D. Clark, C. Ó Cofaigh, D. J. A. Evans, D. Froese, S. L. Norris, M. Margold   +11 more
doaj   +1 more source

The role of subglacial hydrology in ice streams with elevated geothermal heat flux

Journal of Glaciology, 2020
The spatial distribution of geothermal heat flux (GHF) under ice sheets is largely unknown. Nonetheless, it is an important boundary condition in ice-sheet models, and suggested to control part of the complex surface velocity patterns observed in some ...
Silje Smith-Johnsen, Basile de Fleurian, Kerim H. Nisancioglu   +2 more
doaj   +1 more source

Marine ice sheet instability and ice shelf buttressing of the Minch Ice Stream, northwest Scotland [PDF]

The Cryosphere, 2018
Uncertainties in future sea level projections are dominated by our limited understanding of the dynamical processes that control instabilities of marine ice sheets. The last deglaciation of the British–Irish Ice Sheet offers a valuable example to examine
N. Gandy, L. J. Gregoire, J. C. Ely, C. D. Clark, D. M. Hodgson, V. Lee, T. Bradwell, R. F. Ivanovic   +7 more
doaj   +1 more source

Subglacial hydrology as a control on emergence, scale, and spacing of ice streams [PDF]

J. Geophys. Res. Earth Surf., 120 (2015), 2015
Observations have long associated ice streams with the presence of meltwater at the bed. More recently, theoretical models have been able to reproduce ice-stream behaviour as a consequence of the coupled dynamics of ice and subglacial meltwater.
arxiv   +1 more source

Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) [PDF]

The Cryosphere, 2014
The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland ...
P. Vallelonga, K. Christianson, R. B. Alley, S. Anandakrishnan, J. E. M. Christian, D. Dahl-Jensen, V. Gkinis, C. Holme, R. W. Jacobel, N. B. Karlsson, B. A. Keisling, S. Kipfstuhl, H. A. Kjær, M. E. L. Kristensen, A. Muto, L. E. Peters, T. Popp, K. L. Riverman, A. M. Svensson, C. Tibuleac, B. M. Vinther, Y. Weng, M. Winstrup   +22 more
doaj   +1 more source

Subglacial hydrology and the formation of ice streams [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2014
Antarctic ice streams are associated with pressurized subglacial meltwater but the role this water plays in the dynamics of the streams is not known. To address this, we present a model of subglacial water flow below ice sheets, and particularly below ice streams.
Andrew C. Fowler, Andrew C. Fowler, T.M. Kyrke-Smith, Richard F. Katz   +3 more
openaire   +4 more sources

Modeling Antarctic subglacial lake filling and drainage cycles [PDF]

The Cryosphere, 2016
The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the
C. F. Dow, M. A. Werder, S. Nowicki, R. T. Walker   +3 more
doaj   +1 more source

MT-IceNet -- A Spatial and Multi-Temporal Deep Learning Model for Arctic Sea Ice Forecasting [PDF]

IEEE Xplore pp. 1-10 (2022), 2023
Arctic amplification has altered the climate patterns both regionally and globally, resulting in more frequent and more intense extreme weather events in the past few decades. The essential part of Arctic amplification is the unprecedented sea ice loss as demonstrated by satellite observations. Accurately forecasting Arctic sea ice from sub-seasonal to
arxiv   +1 more source

Tidal controls on the flow of ice streams [PDF]

Geophysical Research Letters, 2016
AbstractThe flow of many Antarctic ice streams is known to be significantly influenced by tides. In the past, modeling studies have implemented the tidal forces acting on a coupled ice stream/ice shelf system in a number of different ways, but the consequences that this has on the modeled response of ice streams to tides have, until now, not been ...
Rosier, Sebastian H.R., Gudmundsson, G. Hilmar   +1 more
openaire   +3 more sources

Array processing in cryoseismology: a comparison to network-based approaches at an Antarctic ice stream [PDF]

The Cryosphere, 2023
Seismicity at glaciers, ice sheets, and ice shelves provides observational constraint on a number of glaciological processes. Detecting and locating this seismicity, specifically icequakes, is a necessary first step in studying processes such as basal ...
T. S. Hudson, A. M. Brisbourne, S.-K. Kufner, J.-M. Kendall, A. M. Smith   +4 more
doaj   +1 more source