Sentences with phrase «ice streams»
"Ice streams" refer to fast-flowing rivers of ice within a larger ice sheet or glacier. These streams move much quicker than the surrounding ice and are similar to rivers of water, but made up of frozen ice instead. Full definition
Model experiments on the evolution and stability of ice streams.
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However, scientists have several ingenious ways in which they can observe changes to this fragile, important ice stream.
Recent observations (summarized by Alley et al. (2005); see references therein) of acceleration of glaciers behind the collapsed Larsen B ice shelf, of ice streams in the Amunden Sea sector of West Antarctica, and of many Greenland outlet glaciers suggest that the time - scales for ice - dynamical changes may be much shorter.
«The IPCC's [Intergovernmental Panel on Climate Change] 4th and 5th Assessment Reports both note that the acceleration of West Antarctic ice streams in response to ocean warming could result in a major contribution to sea - level rise, but that models were unable to satisfactorily quantify that response,» says Stephen Cornford from University of Bristol, UK and lead - author of the study.
Lead author Dr Malcolm McMillan from the University of Leeds said: «We find that ice losses continue to be most pronounced along the fast - flowing ice streams of the Amundsen Sea sector, with thinning rates of between 4 and 8 metres per year near to the grounding lines of the Pine Island, Thwaites and Smith Glaciers.»
Crevasse deformation and examples from ice stream B, Antarctica.
Shabtaie, S., and C.R. Bentley, West Antarctic ice streams draining into the Ross Ice Shelf: configuration and mass balance, Journal of Geophysical Research, Vol.
Satellite imagery of the onset of streaming flow of ice streams C and D, West Antarctica, Journal of Geophysical Research, Vol.
Anandakrishnan, S., D.D. Blankenship, R.B. Alley and P.L. Stoffa, Influence of subglacial geology on the position of a West Antarctic ice stream from seismic observations.
Pine Island Glacier is one of the largest ice streams in Antarctica, and drains much of the West Antarctic Ice Sheet.
Patterns of calculated basal drag on ice streams B and C, Antarctica.
He said the new paper highlights many things that are still not well - known to scientists, such as extensive information about water temperature reaching the grounding line of the outlets of the northeast Greenland ice stream, where water is probably most influential with melt.
The Zachariae ice stream retreated about 20 kilometers (12.4 miles) over the last decade, the researchers concluded.
Episodic retreat is recorded by mega-scale glacial lineations that are overprinted by transverse grounding - zone wedges, each recording a pause in ice stream retreat with a stationary grounding line.
Deformation of till beneath ice stream B, West Antarctica.
Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former bed can be imaged using modern swath sonar tools.
Increased ice flow in this region is particularly troubling, Khan said, because the northeast ice stream stretches more than 600 kilometers (about 373 miles) into the center of the ice sheet, where it connects with the heart of Greenland's ice reservoir.
He predicted northeast Greenland would overtake the Jakobshavn ice stream within a few years as Greenland's largest contributor to sea - level rise.
You have been studying the Whillans ice stream in West Antarctica.
Ice streams receded both rapidly and episodically, depositing grounding - line wedges during periods of stand - still [40].
Till beneath ice stream B. 3.
West Antarctica's Pine Island Glacier, one of the continent's fastest - changing ice streams, looks to be recreating 8,000 - year - old history as it shrinks and thins, a new study suggests.
«Radar studies at the mouths of ice streams D and E, Antarctica,» Annals of Glaciology, 17, p. 262 - 268.
A model of a polar ice stream, and future sea - level rise due to possible drastic retreat of the West Antarctic ice sheet.
Map showing location of modern ice streams around Antarctica, made using velocity data from Rignot et al. 2011
For comparison, one of the fastest moving glaciers, the Jakobshavn ice stream in southwest Greenland, has retreated 35 kilometers (21.7 miles) over the last 150 years.
Much remains mysterious about ice streams in Greenland — and even vaster ones in Antarctica, which have also surged ominously.
The 150 - km - long ice stream drains a large part of southern Greenland.
For ice streaming sections of large outlet glaciers (in Antarctica as well) there is always water at the base of the glacier that helps lubricate the flow.
Jakobshavn Glacier is one of the fastest moving ice streams in the world contributing massive amount of ice to the oceans.
The PIG is not dominated by its ice shelf, hence the potential for rapid ice stream response.
Velocity pattern in a transect across ice stream B, Antarctica.
Wet - based areas include ice streams, outlet glaciers, and regions underlain by subglacial lakes [3, 34].
A relatively small fraction of the ice sheet comprises several rapidly flowing ice streams which drain the ice to the sea.
«Recent dramatic thinning of largest West Antarctic ice stream triggered by oceans.»
Recent glacial history and rapid ice stream retreat in the Amundsen Sea.
Ice shelf collapse and glacier recession here, in front of the large ice streams such as Pine Island Glacier and Thwaites Glacier, would have potential to raise sea levels by tens of centimetres to a metre, through the process of marine ice sheet instability23.
(They are using radar and seismic sensors over several years to gain a more precise understanding of the physics of iceberg calving where such ice streams meet the sea.)
One Ross ice stream stopped flowing 150 years ago.
Robert D. Larter, Alastair G.C. Graham, Karsten Gohl, Gerhard Kuhn, Claus - Dieter Hillenbrand, James A. Smith, Tara J. Deen, Roy A. Livermore, Hans - Werner Schenke; Subglacial bedforms reveal complex basal regime in a zone of paleo — ice stream convergence, Amundsen Sea embayment, West Antarctica.
In order to constrain future ice stream behaviour, a detailed understanding of subglacial bed properties and bed geometry is required [44].
«Radar observations of a relict ice stream margin traversing Siple Dome, Antarctica,»» Antarctic Journal of the United States, XXX (5), (in press).
These palaeo - ice streams occupied bathymetric troughs, and are identified by the glacial bedforms (such as mega-scale glacial lineations) in these troughs, and trough - mouth fans at their termini.