Sentences with phrase «based ice sheets»

If the land - based ice sheets of Greenland or Antarctica melt or fall into the sea, global sea levels will rise calamitously.

In that way, Arctic ice is unlike land - based ice sheets and glaciers in places like Greenland and Antarctica — when that ice tips off its rocky seat into the ocean, high tides all over the planet lap a little farther up the shoreline.

The report singles out coastal areas, including low - lying island nations, as hot spots of elevated risk that may not be completely manageable due to the steady climb in global sea levels projected to take place during the rest of this century, as the planet warms and land - based ice sheets melt.

However, the report notes that should sectors of the marine - based ice sheets of Antarctic collapse, sea level could rise by an additional several tenths of a meter during the 21st century.

In its latest assessment report, the Intergovernmental Panel on Climate Change (IPCC) concluded that there wasn't sufficient evidence available to put an exact number on how much the collapse of marine - based ice sheets could add to sea levels by 2100.

-RRB- concluded that there wasn't sufficient evidence available to put an exact number on how much the collapse of marine - based ice sheets could add to sea levels by 2100.

The new study shows that scientists are getting to grips with understanding changes in marine - based ice sheets, Scambos says.

Interactions between the ocean and ice sheets are particularly important in determining ice sheet changes, as a warming ocean can melt the ice shelves, the tongues of ice that extend from the ice sheets into the ocean and buttress the large land - based ice sheets [92], [202]--[203].

The main root of this threat is the potential collapse of West Antarctica's marine - based ice sheets — massive expanses of glacial ice that rest not on land but the ocean floor — in particular, those where warm ocean waters circulate nearby [Intergovernmental Panel on Climate Change (IPCC), 2013].

Finally, it's slightly off - topic, because we are discussing Charney type sensitivities for climate responses that are discernible over the course of perhaps a few centuries at most, but Jim Hansen has argued that when longer term responses are included (e.g., disappearance of land - based ice sheets), a reasonable modal value is 6 C per doubling, and an upper limit is considerably higher.

(04/01/2013) Warming about twice as fast as the rest of the world, the Arctic is already undergoing massive upheavals from climate change: summer sea ice is thinning and vanishing, land based ice sheets are melting, and sea levels are rising.

Interestingly, previous research has shown that ice sheet mass contributions from land - based ice sheets have exceeded thermal expansion as the biggest contributor to global sea level rise.

Ice shelves serve as a crucial barrier to prevent land - based ice sheets as well as glaciers from melting into oceans and increasing sea levels.

Ancillary to Bob Loblaw's fine comment at 232, previous research has shown that ice sheet mass contributions from land - based ice sheets have exceeded thermal expansion as the biggest contributor to global sea level rise.

«Beyond 2 degrees you risk potentially catastrophic impacts such as a destabilization of the polar land - based ice sheets that would have very severe economic consequences which are not present in the economic models,» Ward at LSE said.

Thus, become vulnerable to non-linear disintegration, which means a rapid succession of land based ice sheets flushing into the ocean.

For instance, if several of the world's major land - based ice sheets melt, we could see a 40 - foot rise in sea levels within centuries.

In the absence of accurate data, the IPCC also did not take into account the full potential impact of the destabilization of land - based ice sheets in the polar regions in the projections in its last report.

Charney sensitivity refers to the climate sensitivity when fast - reacting feedbacks (Planck response is a given — also, water vapor, clouds,... I think sea ice, seasonal snow) occur but with other things (land - based ice sheets,... vegetation -LRB-?)-RRB-

The IPCC Fourth Assessment Report did not specifically address these competing factors and essentially ignored the likelihood of much more rapid melting of Greenland and other land - based ice sheets.

Interactions between the ocean and ice sheets are particularly important in determining ice sheet changes, as a warming ocean can melt the ice shelves, the tongues of ice that extend from the ice sheets into the ocean and buttress the large land - based ice sheets [92], [202]--[203].

Marine - based ice sheets are vulnerable to several types of instability.

The new study shows that scientists are getting to grips with understanding changes in marine - based ice sheets, Scambos says.

In its latest assessment report, the Intergovernmental Panel on Climate Change (IPCC) concluded that there wasn't sufficient evidence available to put an exact number on how much the collapse of marine - based ice sheets could add to sea levels by 2100.

This is the case with land - based ice sheets in the Arctic, Greenland and parts of Antarctica.

The West Antarctic ice sheet is a marine - based ice sheet that is mostly grounded below sea level, which makes it much more susceptible to changes in sea level and variations in ocean temperature.

The ICESat bias corrections used by the Zwally team were appropriate for measuring sea ice, but not for measuring high altitude land - base ice sheets like found in Antarctica (the values returned for Lake Vostok alone were so unphysical that they should have made the entire study DOA) 2.

Not exact matches

Holding my dreams in my heart, with a vision of leaping once again on a glassy sheet of ice, I embraced a plant - based diet and started eating vegan!

Yet these model - based estimates do not include the possible acceleration of recently observed increases in ice loss from the Greenland and Antarctic ice sheets.

But microscopic phytoplankton, which rely on the sun for their nutrients and form the base of Arctic food webs, have managed to thrive under ice sheets that are thinning as the poles become warmer.

The result is less water sloshing around the sheet's base, so the ice will last longer.

By measuring the remaining difference — the 20,000 - year old ice deep in the West Antarctic ice sheet is about 1 degree Celsius cooler than the surface — the scientists were able to estimate the original temperature based on how fast pure ice warms up.

«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.»

Alaskan and the Canadian Arctic land - based glacier melt ranks with that of the Greenland Ice Sheet as important contributors to global sea - level rise that is already underway.

Co-author Professor Jonathan Bamber, based at the University of Bristol, and President of the European Geoscience Union (EGU), added: «We are seeing changes in the large - scale circulation patterns, which leads to more frequent sunshine and higher amounts of solar energy reaching the surface of the ice sheet.

Their field - based data also suggest that during major climate cool - downs in the past several million years, the ice sheet expanded into previously ice - free areas, «showing that the ice sheet in East Greenland responds to and tracks global climate change,» Bierman says.

If there's anything more complicated than the global forces of thermal expansion, ice sheet melt and ocean circulation that contribute to worldwide sea - level rise, it might be the forces of real estate speculation and the race - based historical housing patterns that color present - day gentrification in Miami.

When parts of the ice melt, liquid water trickles to the base and this can lubricate the underside of the ice sheet, allowing it to slide more quickly into the sea and drive up sea levels at a faster rate.

That is because the enormous glacier, which constitutes 10 percent of the West Antarctic Ice Sheet, is thinning rapidly, allowing more and more of its land - based ice to reach the sIce Sheet, is thinning rapidly, allowing more and more of its land - based ice to reach the sice to reach the sea.

Camp Century, a United States military base built within the Greenland ice sheet in 1959, doubled as a top - secret site for testing the feasibility of deploying nuclear missiles from the Arctic during the Cold War.

The international team of co-authors, led by Peter Clark of Oregon State University, generated new scenarios for temperature rise, glacial melting, sea - level rise and coastal flooding based on state - of - the - art climate and ice sheet models.

Traveling by helicopter from the main American base of McMurdo Station on Ross Island to the Dry Valleys, researchers fly over a portion of the Ross Ice Shelf and then a corner of the mesmerizing white spread of the East Antarctic Ice Sheet, which is the largest in the world.

The continually dropping slope helps explain why northern Greenland, unlike Antarctica, has no large subglacial lakes: Meltwater that either forms at the base of Greenland's ice sheet or ends up there after draining from the ice sheet's upper surface flows away uninterrupted.

At the Dome A site in East Antarctica — roughly the size of the state of California — the base layer of refrozen ice accounted for up to half the total thickness of the ice sheet, and 24 percent of the area covered by ice.

We know that terrestrial ice sheets can extend half a mile down into the ocean on Earth, yet still support a complex ecology at their base.

What is new, experts said, is the idea that water at the ice sheet's base refreezes in huge amounts that can reshape the surface of the ice sheet.

That base layer can warp and lift the ice above it, which is formed by snow deposited on the ice sheet's surface.

Radar images show that water under the base of the ice sheet refreezes into ice, creating a new bottom layer that accounts for up to half the total thickness of the ice sheet in some locations.

«Based on the UN climate panel's report on sea level rise, supplemented with an expert elicitation about the melting of the ice sheets, for example, how fast the ice on Greenland and Antarctica will melt while considering the regional changes in the gravitational field and land uplift, we have calculated how much the sea will rise in Northern Europe,» explains Aslak Grinsted.

The destabilization of this marine - based sector will increase sea - level rise from the Greenland Ice Sheet for decades to come.