Sentences with phrase «land ice sheets»

Atmospheric cooling, in this case, that would occur in isolation and in the context of a broader and rapidly warming global climate system together with a dangerous warming of the land ice sheets.

Surely the issue relating to the mass of the ice sheet in the case of on - land ice sheets is precipitation as well as temperature.

Melting land ice sheets or warming the water?

The LGM was a very different world than the present, involving considerable expansions of sea ice, massive Northern Hemisphere land ice sheets, geographically inhomogeneous dust radiative forcing, and a different ocean circulation.

The importance of orbital variations, of the greenhouse gases CO2, CH4 and N2O, of the albedo of land ice sheets, annual mean snow cover, sea ice area and vegetation, and of the radiative perturbation of mineral dust in the atmosphere are investigated.

[SLIDE 17] And so not surprisingly sea level is rising as a result not only of the loss of mountain glaciers and the great land ice sheets — losses from the great land ice sheets; but also thermal expansion of sea water because the ocean is getting warmer.

Not exact matches

It's estimated that roughly 99 percent of Earth's land ice is stored in the ice sheets that cover Antarctica and Greenland, so their health is something scientists — and the world — can no longer ignore.

The second cause of sea level increase is the melting of land ice — such as glaciers and ice sheets.

Eventually, the floating ice shelf in front of the glaciers «broke up», which caused them to retreat onto land sloping downward from the grounding lines to the interior of the ice sheet.

Capt. Roald Amundsen, the discoverer of the Northwest Passage, left Norway in June, 1910, in the «Fram,» seemingly with the intention of sailing around Cape Horn, however, he sailed to the westward across the South Pacific, and made a landing at whale Bay on the ice sheet covering Ross Sea.

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.

«It's hard to discern an ice sheet's cycles on land because it destroys the evidence,» she says, «but it dumps that evidence in the oceans, archived in layers on the bottom.»

Analyzing and dating these rocks, they found that ocean water began to appear on the ridge's land - facing side in 1945, even as the ice sheet remained grounded on the ridge's summit, scientists report online today in Nature.

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.

Losing those shelves could presage the melting of their parent ice sheets on land — which could lead to a dramatic rise in sea level.

A 15 - meter pan-sharpened Landsat 8 image of the Mount Takahe volcano rising more than 2,000 meters (1.2 miles) above the surrounding West Antarctic ice sheet in Marie Byrd Land, West Antarctica.

The area covered by all the green leaves on Earth is equal to, on average, 32 percent of Earth's total surface area — oceans, lands and permanent ice sheets combined.

Worse still, in places like west Antarctica, ice sheets rest on land that is below sea level, and so could be exposed directly to warm water.

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

During glacial periods, sea level falls as water gets locked up in the ice sheets, and in extreme cases the Bering Strait connecting the Bering Sea to the Arctic Ocean closes and becomes a land bridge.

The argument is that the increased separation of the Antarctic land mass from South America led to the creation of the powerful Antarctic Circumpolar Current which acted as a kind of water barrier and effectively blocked the warmer, less salty waters from the North Atlantic and Central Pacific from moving southwards towards the Antarctic land mass leading to the isolation of the Antarctic land mass and lowered temperatures which allowed the ice sheets to form.

Current estimates of sea - level rise by the Intergovernmental Panel on Climate Change consider only the effect of melting ice sheets, thermal expansion and anthropogenic intervention in water storage on land.

«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.

When they retreat, they leave behind a freshly polished, pristine landscape that is markedly different from land that has not been buried under an ice sheet.

Because so much water was stored on land as ice sheets, sea levels were likely 120 meters lower than today, exposing the bottom of what is now the English Channel.

Other experts, though, say thinning ice sheets on land and calving ice shelves on the sea are reasons for alarm.

But the large volumes of data on Arctic sea and land ice that IceBridge has collected during its nine years of operations there have also enabled scientific discoveries ranging from the first map showing what parts of the bottom of the massive Greenland Ice Sheet are thawed to improvements in snowfall accumulation models for all of Greenlaice that IceBridge has collected during its nine years of operations there have also enabled scientific discoveries ranging from the first map showing what parts of the bottom of the massive Greenland Ice Sheet are thawed to improvements in snowfall accumulation models for all of GreenlaIce Sheet are thawed to improvements in snowfall accumulation models for all of Greenland.

«The traditional view of the loss of land ice on Earth has been that mountain glaciers and ice caps are the dominant contributors, and ice sheets are following behind,» said study co-author Eric Rignot, a glaciologist at NASA's Jet Propulsion Laboratory and the University of California, Irvine.

The P - 3 Orion, based at NASA's Wallops Flight Facility in Virginia, will carry IceBridge's most comprehensive instrument suite: a scanning laser altimeter that measures surface elevation, three types of radar systems to study ice layers and the bedrock underneath the ice sheet, a high - resolution camera to create color maps of polar ice, and infrared cameras to measure surface temperatures of sea and land ice.

From an altitude of just over 700 km, CryoSat will precisely monitor changes in the thickness of sea ice and variations in the thickness of the ice sheets on land.

«Based on the likely location of ice deposits during this period of Mars» history, and the amount of meltwater that could have been produced by Lyot ejecta landing on an ice sheet, we think this is the most plausible scenario for the formation of these valleys» said David Weiss, a recent Ph.D. graduate from Brown and the study's lead author.

Immense ice sheets slowly advance across northern lands, then suddenly melt away to leave the planet basking in a relatively brief period of warmth before the ice creeps back again.

Faced by the loss of so much precious coastal land, it seems quite plausible that our descendants will resort to some kind of mega-project to cool the planet and stop the ice sheets melting.

Again, Monckton must surely know full well that for the last 25 - 30 years satellite temperature measurement of sea and land surface have replaced terrestrial temperature station measurements in many cases since these give a much greater coverage (70 % of the surface of the Earth is water... it's difficult to put weather stations on top of ice sheets etc.!)

[7] The IceCon project aims to gain a better understanding of the rate of the loss of ice — now and in the past - from the Antarctic ice sheet in the Dronning Maud Land area, and includes six partners: Université Libre de Bruxelles, Royal Observatory of Belgium, University of Luxembourg, Norwegian Polar Institute, and Aberystwyth University.

However, it's quite a different matter melting a long - lived massive ice sheet up to 1.5 km thick that covers over 70 % of the land surface (as happened at the end of the last glacial period), from melting isolated and much thinner ice caps / sheets that only cover about 11 % of the land surface (i.e. present - day).»

But an upshot is that the land around Earth's equator, farthest from both ice sheets, is poised to receive the land - ice — sea - level double - punch: Increasing ocean volume and weakening high latitude gravity.

Lloyd, A., Wiens, D., Shore, P., Nyblade, A., Anandakrishnan, S., Aster, R., Huerta, A., Wilson, T., Zhao, D., West Antarctica Ice Sheet Upper Mantle Structure Beneath the Whitmore Mountains, West Antarctic Rift System, and Marie Byrd Land from Body Wave Tomography, Eighteenth annual WAIS workshop, Loveland, CO, 21 - 23 September, 2011.

Domack, E.W., Jull, A.J.T., Anderson, J.B., and Linick, T.W., 1991, Mid-Holocene ice sheet recession from the Wilkes Land continental shelf, East Antarctica: in Thompson, M.R.A., Crame, J.A., and Thompson, J.W. (eds), Geological Evolution of Antarctica, Cambridge University Press, New York, p. 693 - 698.

This phenomenon is further exacerbated by land - ice melt, particularly the Antarctic and Greenland ice sheets.

Ice sheets that form during glaciations cause erosion of the land beneath them.

Here we show that the East Greenland Ice Sheet existed over the past 7.5 million years, as indicated by beryllium and aluminum isotopes (10Be and 26Al) in quartz sand removed by deep, ongoing glacial erosion on land and deposited offshore in the marine sedimentary record.

From 1992 to 2003, the decadal ocean heat content changes (blue), along with the contributions from melting glaciers, ice sheets, and sea ice and small contributions from land and atmosphere warming, suggest a total warming (red) for the planet of 0.6 ± 0.2 W / m2 (95 % error bars).

However, the ice shelves around Antarctica are extremely important for ice sheet stability, because they hold back the land ice.

In northern latitudes the reverse is happening — land is rising after being liberated from the mass of the ice sheets, again normally by less than 1mm / yr, but in places over 5mm / yr (Peltier et al. 2015).

Now as vast areas of land which are currently forested, were covered by the glacial period ice sheets, the temperate forest is no longer using carbon dioxide which adds carbon dioxide to the atmosphere.

If an ice sheet were ablated down to bare ground, less light from the sun would be reflected back into space and more would be absorbed by the land.

Few AOGCMs include ice sheet dynamics; in all of the AOGCMs evaluated in this chapter and used in Chapter 10 for projecting climate change in the 21st century, the land ice cover is prescribed.

Similarly, the different timescales for land biospheric changes and ice sheet changes will almost certainly give a complex transient scenario.

This means that all the energy going into the melting of sea ice, ice sheets and glaciers plus the warming of land and atmosphere is the tiny gap between the blue area and the red line.