Sentences with phrase «zachariae ice stream»

The Zachariae ice stream is about twice the size of Jakobshavn, extending some 373 miles into the interior.

Greenland's ice streams drain the ice sheet via meltwater runoff much in the same way that water basins drain rivers, explained Bevis.

In comparison, it took the Jakobshavn Isbræ ice stream — a southwest Greenland region with a fast - moving glacier that has been a focal point of scientific examination of ice sheet melt — 150 years to retreat 35 kilometers, said Khan.

Scientists discover an important clue in predicting future consequences of climate change: the mechanism that moves ice streams

This water will rush beneath the ice towards the sea and feed into the hydrological catchment of the MacAyeal Ice Stream, one of several major ice streams draining ice from Marie Byrd Land into the Ross Ice Shelf.

The rift system is thought to have a major influence on ice streams in West Antarctica.

«That's the total holy grail right now, to see if we can pin down the response of the ice stream to lakes» filling and draining,» says Helen Fricker of the Scripps Institution of Oceanography in San Diego.

It's one of the largest ice streams draining the West Antarctic ice sheet, hundreds of kilometres long and about 100 kilometres wide.

What is it that you find intriguing about that ice stream?

You have been studying the Whillans ice stream in West Antarctica.

These flow rates are unprecedented: they appear to be the fastest ever recorded for any glacier or ice stream in Greenland or Antarctica, the researchers say.

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.»

The new result focuses on ice loss due to a major retreat of an outlet glacier connected to a long «river» of ice — known as an ice stream — that drains ice from the interior of the ice sheet.

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.

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.

Ice streams drain ice basins, the same way the Amazon River drains the very large Amazon water basin.

The Zachariae ice stream retreated about 20 kilometers (12.4 miles) over the last decade, the researchers concluded.

Zachariae is the largest ice stream in a drainage basin that covers 16 percent of the Greenland ice sheet — an area twice as large as the one drained by Jakobshavn.

«It was literally one of the first days that we were driving across the ice stream, doing what we thought was a pretty standard survey, that I saw the bed of the ice just dropping away,» Bingham said.

A new three - dimensional higher - order thermomechanical ice sheet model: Basic sensitivity, ice stream development, and ice flow across subglacial lakes.

Mouginot and colleagues found that ice streams in West Antarctica are accelerating, with a sustained increase in ice discharge2.

Likewise, Lake Mercer will provide unique information on the history of both the Whillans and Mercer ice streams.

Jacobel, R., K. Christianson, H. Horgan, S. Anandakrishnan, R. Alley, A. Muto, B. Petersen, R. Gobel, B. Keisling and L. Snyder, «Geophysical characteristics of Subglacial Lake Whillans and the ice stream grounding zone, West Antarctica», bibl.

The rates at which the grounding lines of the ice streams recede will increase.

Subglacial Lake Mercer lies below the confluence of the Whillans and Mercer ice streams, making its hydrology distinct within the region.

It's a positive feedback cycle, a viscious loop that means that future recession of the ice stream is inevitable (see Marine Ice Sheet Instability and previous post).

Changes in the margin of ice stream C, Antarctica.

Diagnostic modelling can be used to improve the understanding of the processes controlling the behaviour of a particular ice stream, or to study the importance of one or more physical process in an ice sheet in general.

Merry, C.J. and I.M. Whillans (1993) Ice - flow features on ice stream B, Antarctica, revealed by SPOT HRV imagery, Journal of Glaciology, vol.

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.

The Antarctic continent is drained by numerous large ice streams.

Till beneath ice stream B. 3.

Model experiments on the evolution and stability of ice streams.

Ice - stream behaviour and grounding line retreat is therefore unique to every ice stream.

«Studies of the grounding line location on ice streams D / E, Antarctica,» Annals of Glaciology, 20, p. 39 - 42.

«Studies of internal layering and bedrock topography on ice stream C, West Antarctica,» Antarctic Journal of the United States, XXV (5), p. 82 - 85.

Flow and retreat of the Late Quaternary Pine Island - Thwaites palaeo - ice stream, West Antarctica.

Stagnation of ice stream C, West Antarctica by water piracy.

Sedimentation beneath ice shelves: the view from ice stream B. Marine Geology 85: 101 - 120 (1989).

Patterns of calculated basal drag on ice streams B and C, Antarctica.

The ice streams in Antarctica will be flowing rapidly due to basal sliding — so it is incorrect to say that all glaciers are flowing by internal deformation only.

Shortly after radio - echo sounding was introduced in Antarctica, radio - echo flights during the 1969 - 1970 austral summer identified five ice streams that entered the Ross Ice Shelf from the West Antarctic Ice Sheet.

The photograph shows cracks in ice near the Ferrigno and Alison ice streams in Antarctica seen from the IceBridge DC - 8, Oct. 25, 2012.

Changes in the configuration of ice stream flow from the West Antarctic Ice Sheet, Journal of Geophysical Research, 101 (B3), p. 5499 - 5504.

The Marguerite Bay drainage basin, in contrast, would have been of the order of 10,000 to 100,000 km2 during the LGM, and the ice streams draining this basin would have responded more rapidly to changes in external forcing [47].

Bentley, Charles R., Chen Liu, and Neal E. Lord, Airborne radar sounding over West Antarctic ice streams, Antarctic Journal, 31 (2), p. 62 - 64, 1996.

Ice stream - ice shelf interaction in West Antarctica, in Dynamics of the West Antarctic Ice Sheet, C.J. van der Veen and J. Oerlemans, eds., D. Reidel Pub., pp. 161 - 180.

This brief overview can only give a flavor of the size and scope of research that has been conducted on West Antarctic ice streams and ice ridges by the glaciologists honored by ACAN.

The 11 - hour round - trip from Punta Arenas included a series of low - level passes over the massive ice stream which is 20 miles wide and in places more than one mile thick.

A subglacial aquifer bed model and water pressure dependent basal sliding relationship for a West Antarctic ice stream.