Sentences with phrase «glaciers and ice sheets with»

NASA airborne campaigns like Operation IceBridge have been measuring Greenland and Antarctica's glaciers and ice sheets with a range of...

Not exact matches

Impacts of thermal expansion and melting mountain glaciers can be predicted with moderate confidence, but more uncertainty remains in the potential behavior of polar ice sheets.

Studying surging glaciers could also offer insights into grander - scale ice flows with global consequences: the movements of the ice sheets in Antarctica and Greenland, which can change abruptly, altering the ice discharges that affect sea level.

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.

In contrast to glaciers and ice sheets, which sit on the ground, ground ice sits in the ground, mixed with frozen soil or buried under layers of sediment.

For that topic the scientists deferred to Don Blankenship, a University of Texas geophysicist and glaciologist with decades of experience using powerful radar to analyze ice sheets and glaciers in Antarctica.

There also was an assumption that many melting glaciers on the ice sheet's periphery eventually would retreat to higher ground on this flat bedrock, cutting off contact with warm ocean waters and slowing down the ice sheet's shedding.

«I don't think we expected ice sheets to run neck - and - neck with mountain glaciers, which basically sit in a warmer climate, this soon,» he said.

«Our work shows that the data collected is very well - suited for ice sheet science, and we can combine it with other satellite and airborne data sets to establish a more detailed record of these glaciers.»

Professor Poinar continues, «Mammoths were much better at adapting to new habitats than we first thought — we suspect that subgroups of mammoths evolved to deal with local conditions, but maintained genetic continuity by encountering and potentially interbreeding with each other where their two different habitats met, such as at the edge of glaciers and ice sheets.»

The research published in Nature Communications found that in the past, when ocean temperatures around Antarctica became more layered - with a warm layer of water below a cold surface layer - ice sheets and glaciers melted much faster than when the cool and warm layers mixed more easily.

Many scientists concede that without drastic emissions reductions by 2020, we are on the path toward a 4C rise as early as mid-century, with catastrophic consequences, including the loss of the world's coral reefs; the disappearance of major mountain glaciers; the total loss of the Arctic summer sea - ice, most of the Greenland ice - sheet and the break - up of West Antarctica; acidification and overheating of the oceans; the collapse of the Amazon rainforest; and the loss of Arctic permafrost; to name just a few.

It is noteworthy that whereas ice melt from glaciers, ice caps and ice sheets is very important in the sea level budget (contributing about 40 %), the energy associated with ice melt contributes only about 1 % to the Earth's energy budget.

Combined with melting from mountain glaciers and the Greenland Ice Sheet, this could result in flooding of low - lying areas of Earth over the next century.

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).

An additional new feature is the increasingly visible fast dynamic response of ice shelves, for example, the dramatic breakup of the Larsen B Ice Shelf in 2002, and the acceleration of tributary glaciers and ice streams, with possible consequences for the adjacent part of the ice sheeice shelves, for example, the dramatic breakup of the Larsen B Ice Shelf in 2002, and the acceleration of tributary glaciers and ice streams, with possible consequences for the adjacent part of the ice sheeIce Shelf in 2002, and the acceleration of tributary glaciers and ice streams, with possible consequences for the adjacent part of the ice sheeice streams, with possible consequences for the adjacent part of the ice sheeice sheets.

This acceleration in sea - level rise is consistent with a doubling in contribution from melting of glaciers, ice caps and the Greenland and West - Antarctic ice - sheets.

From 1993 to 2003, thermal expansion contributed slightly more than half the sea level rise with the rest coming from melting glaciers and ice sheets (IPCC AR4).

The rapid shrinkage of glaciers around the Antarctic Peninsula, coupled with the potential for ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [Ice Sheet, and this is an area of urgent current research [3].

As discussed on the CRYOLIST listserv, the confusion came most likely from a confusion in definitions of what is the permanent ice sheet, and what are glaciers, with the «glaciers» being either dropped from the Atlas entirely or colored brown (instead of white)(No - one that I have seen has posted the legend from the Atlas that gives the definition of the various shadings, though in the 1994 edition I have, glaciers are (unsurprisingly) white, not brown).

... the confusion came most likely from a confusion in definitions of what is the permanent ice sheet, and what are glaciers, with the «glaciers» being either dropped from the Atlas entirely or colored brown (instead of white)... there is simply no measure — neither thickness nor areal extent — by which Greenland can be said to have lost 15 % of its ice.

The lower trend found by our study is consistent with the median projected sums of thermal expansion and glacier mass loss, implying that no net contribution from polar ice sheets is needed over 1901 - 1990.

(1) One is the ice sheet and glacier mechanical collapse, which doesn't require a whole lot more warming, but will happen with some set minimum amount of warming over some time period; and (2) the other is global warming that keeps increasing beyond the level needed to cause # 1, which among other things will perhaps lead to positive carbon feedbacks (e.g., from melting permafrost and hydrates).

This acceleration in sea level rise is consistent with a doubling in contribution from melting of glaciers, ice caps and the Greenland and West - Antarctic ice sheets.

The former vice president's movie — replete with the prospect of a flooded New York City, an inundated Florida, more and nastier hurricanes, worsening droughts, retreating glaciers and disappearing ice sheets — mostly got the science right, said all 19 climate scientists who had seen the movie or read the book and answered questions from The Associated Press.....

Generally speaking things look bad, what with the West Antarctic ice sheet slip - sliding away into the tropics, the Greenland glaciers retreating, animals beating a retreat to the coolth of higher altitudes and latitudes, and a host of other apocalyptic signals.

The Arctic (North Pole) has shown the most rapid rate of warming, with dramatic effects such as shrinking of this region's glaciers, ice caps, ice sheets, and permafrost.

The map shows the distribution of glaciers on the European continent, Svalbard, Iceland and in the periphery of the Greenland Ice Sheet together with the locations of glaciers with long - term mass change measurements.

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).

To notice something is going on with the world's ice sheets, you could measure melting water runoff, glacier retreat or use satellites and GPS to measure ice volume decline.

While worries about rising sea levels are focused on the massive ice sheets of Greenland and Antarctica, the loss of small mountain glaciers comes with its own consequences.

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 toppliAnd 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 toppliand forcing them apart (hydrofracturing), or the innate rigidity and frailty of steep ice cliffs which render them susceptible to rapid toppliand frailty of steep ice cliffs which render them susceptible to rapid toppling.

To say nothing of the warming trends also noticed in, for example: * ocean heat content * wasting glaciers * Greenland and West Antarctic ice sheet mass loss * sea level rise due to all of the above * sea surface temperatures * borehole temperatures * troposphere warming (with stratosphere cooling) * Arctic sea ice reductions in volume and extent * permafrost thawing * ecosystem shifts involving plants, animals and insects

Melting polar ice in the Arctic and Antarctic regions, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia, are expected to raise sea levels significantly.

If today's worst - case global warming scenarios of catastrophic melting of glaciers and ice sheets come to pass, sea levels could rise rapidly, wreaking all sorts of geological havoc «comparable with the most rapid increases in sea level that we've seen in the last 15,000 years,» McGuire said.

Presenting such alternative figures confuses and undermines the public understanding of the actual science, which is an understanding about the driving mechanisms of sea level rise: thermal expansion of ocean water, melting of mountain glaciers and complex dynamics of large ice sheets — in correspondence again with projected temperature rise, that is in turn a product of projected rises of greenhouse gas concentrations using calculated estimates of climate sensitivity, together creating a net disturbance in Earth's energy balance, the very root cause of anthropogenic climate change.

As explained in the press release, the scientists began with the measure of sea level rise between 2005 and 2013, then deducted the amount of rise due to meltwater (e.g., melting ice sheets and loss of glacier mass worldwide) and then the amount of rise due to the expansion of water from the warming in the upper portion of the world's oceans (which scientists have good data on).

Much talk surrounds the deterioration of glaciers and ice sheets — particularly, how they are thinning and losing mass with global warming; but the mechanisms are complicated and scientists want to...

Accounting for ice - sheets and glaciers, global sea - level rise may exceed 1 meter by 2100, with a rise of up to 2 meters considered an upper limit by that time.

They report in the journal Science that a succession of aerial surveys combined with multiple satellite observations has established that the base of the glacier is being eroded rapidly by a mix of warmer ocean water and increasing amounts of meltwater from the surface of the Greenland ice sheet.

While the loss of glacier mass has continued for the past few decades with a slight increase in recent years, the rate of mass loss from the Greenland ice sheet has dramatically increased in the past decade and continues to increase.

Unless global temperatures are stabilized, higher seas from melting ice sheets and mountain glaciers, combined with the heat - driven expansion of ocean water itself, will eventually lead to the displacement of millions of people as low - lying coastal areas and island nations are inundated.

Adding together the observed individual components of sea level rise (thermal expansion of the ocean water, loss of continental ice from ice sheets and mountain glaciers, terrestrial water storage) now is in reasonable agreement with the observed total sea - level rise.

Such solecisms throughout the IPCC's assessment reports (including the insertion, after the scientists had completed their final draft, of a table in which four decimal points had been right - shifted so as to multiply tenfold the observed contribution of ice - sheets and glaciers to sea - level rise), combined with a heavy reliance upon computer models unskilled even in short - term projection, with initial values of key variables unmeasurable and unknown, with advancement of multiple, untestable, non-Popper-falsifiable theories, with a quantitative assignment of unduly high statistical confidence levels to non-quantitative statements that are ineluctably subject to very large uncertainties, and, above all, with the now - prolonged failure of TS to rise as predicted (Figures 1, 2), raise questions about the reliability and hence policy - relevance of the IPCC's central projections.

The study argues that ice sheets in contact with the ocean, including the many West Antarctic glaciers that end in floating ice shelves, «are vulnerable to non-linear disintegration» due to a combination of atmospheric warming and major shifts in ocean circulation that would result from a surge in freshwater flowing into the ocean in the North Atlantic (from Greenland), and Southern Ocean (from Antarctica).

«The melting of the ice sheets and the glaciers is a crisis in the Himalayas,» said H.P.S. Ahluwalia, who runs the Indian Mountaineering Foundation, which is organizing the expedition with China's Institute of Geology and Geophysics.

The thermosteric acceleration is small compared with the ice sheets, but on par with the acceleration from mountain glaciers and small ice caps.

The new methods involve filtering out noise from the data produced by the Gravity Recovery And Climate Experiment (GRACE) spacecraft, sent into orbit with the aim of finding out just how much ice is melting from the world's ice sheets and glacieAnd Climate Experiment (GRACE) spacecraft, sent into orbit with the aim of finding out just how much ice is melting from the world's ice sheets and glacieand glaciers.

The range of 1.4 °C to 4.3 °C in the committed warming overlaps and surpasses the currently perceived threshold range of 1 °C to 3 °C for dangerous anthropogenic interference with many of the climate - tipping elements such as the summer arctic sea ice, Himalayan - Tibetan glaciers, and the Greenland Ice Sheice, Himalayan - Tibetan glaciers, and the Greenland Ice SheIce Sheet.

Airborne and satellite observations of West Antarctic topography and glacier flow speeds are combined with a computer model simulating ocean - driven glacier melting to show that the ice sheet's collapse is already underway.