Sentences with phrase «margins of ice sheets»

... suggesting that Dansgaard - Oeschger events resulted from a combination of the effects of sea ice and ice shelves — structures that help define the margins of ice sheets — to account for both the rapid and the slower parts of the cycle.

The margins of all ice sheets (including Greenland) are in retreat, and accumulation is negative over almost the whole of the West Antarctic sheet.

How and when is fresh water added to the margins of ice sheets?

«The beds at the margins of the ice sheet... are probably one of the least explored parts of Earth's surface,» said Ian Howat, a glaciologist at Ohio State University who did not participate in the research.

«The effort to use the old photographs to learn how the margins of the ice sheet have changed is wonderful,» said Richard Alley, a glaciologist at Pennsylvania State University.

In northwest Greenland there is a 70 - km stretch of the margin of the ice sheet called the Crimson Cliffs.

Satellite data show that the margins of the ice sheet have darkened by as much as 5 % per decade since 2001.

«Since most ice sheet erosion occurs at the margin of the ice sheet, that indicated times when the ice sheet retreated,» Cook said.

Not exact matches

The Dark Zone of Greenland ice sheet is a large continuous region on the western flank of the ice sheet; it is some 400 kilometers wide stretching about 100 kilometres up from the margin of the ice.

Tranter says he got the idea for Black and Bloom about four years ago, when he was working on the margins of the Greenland ice sheet and forgot his glacier goggles.

A study of the demise of the Laurentide Ice Sheet that once covered Canada may help scientists better understand shrinking ice fields today — like this melting ice margin in GreenlaIce Sheet that once covered Canada may help scientists better understand shrinking ice fields today — like this melting ice margin in Greenlaice fields today — like this melting ice margin in Greenlaice margin in Greenland.

A team from Rutgers University and the University of Georgia, led by Asa Rennermalm of Rutgers, measures meltwater runoff from the ice sheet margin in Greenland during summer 2013.

So, now it seems that all of the margins of the Greenland ice sheet are unstable.»

The full study, «Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets,» was published in Nature (subs.

As more ice are removed near the ice margin, more intraplate earthquakes are induced and this positive feedback may explain the fast collapse of ice sheets.

[this is useful, the pre-ice age era, ~ 2.5 — 3.6 million years ago, last time CO2 levels were as high as today] In response to Pliocene climate, ice sheet models consistently produce near - complete deglaciation of the Greenland ice sheet (+7 m) and West Antarctic ice sheet (+4 m) and retreat of the marine margins of the Eastern Antarctic ice sheet (+3 m)(Lunt et al., 2008; Pollard and DeConto, 2009; Hill et al., 2010), altogether corresponding to a global mean sea level rise of up to 14 m.

The sea - level estimates are consistent with those from delta18O curves and numerical ice sheet models, and imply a significant sensitivity of the WAIS and the coastal margins of the EAIS to orbital oscillations in insolation during the Mid-Pliocene period of relative global warmth.

This conclusion was based on the fact that the WAIS margin was ringed with stabilizing ice shelves, and that much of the ice sheet is grounded below sea level.

«We were able to see for the first time that there is widespread thinning at the margin of the Greenland ice sheet throughout this region.

The ice sheet is almost 2,400 kilometres long in a north - south direction, and its greatest width is 1,100 kilometres at a latitude of 77 ° N, near its northern margin.

The retreat sequence along the eastern margin of the Laurentide Ice Sheet is especially relevant for understanding climate variability.

What kind of evidence would be an indicator of ice - sheet margin retreat?

Its key finding is that during the Pliocene there occurred a series of long, warm intervals during which parts of the East Antarctic Ice - Sheet margin retreated hundreds of kilometres inland.

Pritchard, H. D., Arthern, R. J., Vaughan, D. G. & Edwards, L. A. Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets.

The European Space Agency's CryoSat - 2 mission has enhanced Antarctic ice sheet monitoring by including areas closer to the poles than earlier satellites, and by acquiring better data in moderately sloping areas, including ice sheet margins where most of the ice loss occurs.

Coincident with rift formation was the sudden disintegration of the ice mélange that filled the northern shear margin, resulting in ice sheet detachment from this margin.

Marine sediment record from the East Antarctic margin reveals dynamics of ice sheet recession.

Cartoon of different paleoenvironmental scenarios of sea ice and ice sheet extent at the East Siberian Continental Margin / Southern Lomonosov Ridge area.

Such an extended ice sheet associated with strong katabatic winds should have caused polynya - like open - water conditions in front of the ice sheet (Fig. 5a), resulting in increased fluxes of phytoplankton, ice algae and terrigenous matter as observed in the PS2757 - 8 record (Fig. 2c and Fig. 6, Scenario 2), i.e., a situation similar to that proposed for the Barents Sea continental margin (Fig. 5a) 57, 58.

The Greenland ice sheet terminates along this so - called grounded ice margin near the town of Ilulissat.

Timescales of methane seepage on the Norwegian margin following collapse of the Scandinavian Ice Sheet.

Joughin and others, 2008 observed that seasonal drainage of meltwater to the glacier bed induces a uniform acceleration of 50 — 150 meters / year over a ~ 300 km long section of the West Greenland margin that is not drained by outlet glaciers, causing a large fractional acceleration of the interior ice sheet but a small fractional change in the speed of fast - moving outlet glaciers.

«This implies that changes at the margin can affect the mass balance deep in the centre of the ice sheet,» said Dr Khan.

Observation of a precipitation map (focused not on the outer margin, but on the accumulation zone of the ice sheet) indicates that highest accumulation rates, over 40 cm per year, extend along the western side of the ice sheet to the southeast quadrant of the ice sheet.

Perhaps their most telling finding is that there is a definite difference between fast - flowing tidewater glaciers and slower parts of the ice - sheet margins.

Research now shows that all margins of the Greenland ice sheet are now unstable — and [continue reading...]

Josh Willis, a lead NASA scientist for the Jason missions, which measure sea level rise from space and Ocean's Melting Greenland (OMG), is a passionate communicator about human - caused global warming.Come listen to a talk on what his team has found out about the role of the oceans in ice loss around the margins of the Greenland Ice Sheice loss around the margins of the Greenland Ice SheIce Sheet.

Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets.

At times, its southern margin included the modern sites of New York City and Chicago, and then followed quite precisely the present course of the Missouri River up to the northern slopes of the Cypress Hills, beyond which it merged with the Cordilleran Ice Sheet.

The evidence comes from a remarkable find at the margins of the Quelccaya ice cap in Peru, the world's largest tropical ice sheet.

1955 Richard F. Flint, «Rates of Advance and Retreat of the Margin of the Late - Wisconsin Ice Sheet.»