Sentences with phrase «old sheet of ice»

Not exact matches

The plume is far older than the recent period of atmospheric warming; indeed, at 50 million to 110 million years old, it's older than our species and the West Antarctic Ice Sheet itself.

«Very old ice probably exists in small isolated patches at the base of the ice sheet that have not yet been identified, but in many places it has probably melted and flowed out into the ocean.»

Scientists estimate the lake itself is roughly 14 million years old — the age of the ice sheet that covers it — and that the water currently in the lake is roughly 1 million years old.

But the bottoms - up ice formation could make finding that old ice harder, since the new layer of ice scrambles the older layers of ice above it, or it could make it easier, because the older ice will be closer to the surface of the ice sheet.

The oldest ice, trapped in the deepest part of the ice sheet, could reveal temperatures eons ago.

Many older models of Greenland assumed that its massive ice sheet sat on bedrock that was relatively flat, even though scientists did not know the full thickness of the ice.

«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 the lab, ancient bacteria from ice samples 420,000 years old, retrieved from more than 2 miles (3 km) inside the ice sheet, have quickly shown signs of life.

It's hard to make a lot of sense out of «previously thought» because the «old thought» in general was that ice sheets were fairly stagnant on decadal timescales.

Our older projections, which were developed to be consistent with some key findings of the Intergovernmental Panel on Climate Change (IPCC)'s Fifth Assessment Report, assumed a steady increase in the rate of ice - sheet shrinkage.

The compression fuses old, buried snowflakes together until they become a dense, rock - hard sheet of ice.

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National Snow and Ice Data Center This comprehensive National Snow and Ice Data Center Web site, useful for teacher reference or for older students, includes information on snow and ice as indicators of climate change, snow avalanches, blizzards, historical snow data, the climate of the Arctic and Antarctic regions, glaciers, sea ice, ice sheets, ice shelves, and iceberIce Data Center This comprehensive National Snow and Ice Data Center Web site, useful for teacher reference or for older students, includes information on snow and ice as indicators of climate change, snow avalanches, blizzards, historical snow data, the climate of the Arctic and Antarctic regions, glaciers, sea ice, ice sheets, ice shelves, and iceberIce Data Center Web site, useful for teacher reference or for older students, includes information on snow and ice as indicators of climate change, snow avalanches, blizzards, historical snow data, the climate of the Arctic and Antarctic regions, glaciers, sea ice, ice sheets, ice shelves, and iceberice as indicators of climate change, snow avalanches, blizzards, historical snow data, the climate of the Arctic and Antarctic regions, glaciers, sea ice, ice sheets, ice shelves, and iceberice, ice sheets, ice shelves, and iceberice sheets, ice shelves, and iceberice shelves, and icebergs.

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Other factors would include: — albedo shifts (both from ice > water, and from increased biological activity, and from edge melt revealing more land, and from more old dust coming to the surface...); — direct effect of CO2 on ice (the former weakens the latter); — increasing, and increasingly warm, rain fall on ice; — «stuck» weather systems bringing more and more warm tropical air ever further toward the poles; — melting of sea ice shelf increasing mobility of glaciers; — sea water getting under parts of the ice sheets where the base is below sea level; — melt water lubricating the ice sheet base; — changes in ocean currents -LRB-?)

NPR gave some of the history as found here: http://pubs.aina.ucalgary.ca/arctic/Arctic39-1-15.pdf (the ice loss has been happening for more than a century, but the last bits of the old ice age ice sheet are going fast now ``... a total of 48 square km... calved from Milne and Ayles ice shelves between July 1959 and July 1974.....»

Arctic air temperatures are increasing at twice the rate of the rest of the world — a study by the U. S. Navy says that the Arctic could lose its summer sea ice by next year, eighty - four years ahead of the models — and evidence little more than a year old suggests the West Antarctic Ice Sheet is doomed, which will add between twenty and twenty - five feet to ocean leveice by next year, eighty - four years ahead of the models — and evidence little more than a year old suggests the West Antarctic Ice Sheet is doomed, which will add between twenty and twenty - five feet to ocean leveIce Sheet is doomed, which will add between twenty and twenty - five feet to ocean levels.

The textbooks, noting the age of old moraines plowed up by the ice sheet frontiers, would have said the ice ages went back about 800,000 years.

When one couples the plausibility of underground heat causing instability in one region with the old newspaper articles about fears of ice sheet collapse from 100 years ago, at a minimum a reasonable person should wonder what has really been going on for many centuries.

And this way, they also got the longest possible record, striking bedrock after seeing ice that was 250,000 years old, the date of the warm period before last, the one that melted much of Greenland's ice sheet.

And older climate models did not include dynamic ice sheet vulnerabilities — like high latent - heat ocean water coming into contact with the submerged faces of sea - fronting glaciers, the ability of surface melt water to break up glaciers by pooling into cracks and forcing them apart (hydrofracturing), or the innate rigidity and frailty of steep ice cliffs which render them susceptible to rapid toppling.

With the albedo - flip kicking in, the energy poured into killing off millennia - old MY ice will then go into the warming of the Arctic Ocean itself, with the result of longer and longer melt seasons each year & a corresponding ramp - up of ice loss from both the Greenland Ice Sheet and the West Antarctic Ice Sheice will then go into the warming of the Arctic Ocean itself, with the result of longer and longer melt seasons each year & a corresponding ramp - up of ice loss from both the Greenland Ice Sheet and the West Antarctic Ice Sheice loss from both the Greenland Ice Sheet and the West Antarctic Ice SheIce Sheet and the West Antarctic Ice SheIce Sheet.

«You have all these old - school ice sheet modelers saying «You can't have fast responses of ice sheets,»» Siddall said.

Our older projections, which were developed to be consistent with some key findings of the Intergovernmental Panel on Climate Change (IPCC)'s Fifth Assessment Report, assumed a steady increase in the rate of ice - sheet shrinkage.

The new data, which provide the best assessment yet of the mass balance of the Ross Ice Streams, indicate the ice sheet is growing by 26.8 gigatons annually, in contrast to older estimates that there has been an ice mass shrinkage of 20.9 gigatons annualIce Streams, indicate the ice sheet is growing by 26.8 gigatons annually, in contrast to older estimates that there has been an ice mass shrinkage of 20.9 gigatons annualice sheet is growing by 26.8 gigatons annually, in contrast to older estimates that there has been an ice mass shrinkage of 20.9 gigatons annualice mass shrinkage of 20.9 gigatons annually.