Sentences with phrase «outlet glacier ice»

This suggests that glacial ice acceleration due to changes in seasonal meltwater flux tend to not make a significant overall change in outlet glacier ice velocities.

Not exact matches

Millan, a UCI graduate student researcher in Earth system science, and his colleagues analyzed 20 major outlet glaciers in southeast Greenland using high - resolution airborne gravity measurements and ice thickness data from NASA's Operation IceBridge mission; bathymetry information from NASA's Oceans Melting Greenland project; and results from the BedMachine version 3 computer model, developed at UCI.

Within a few years, the main outlet glacier draining the region — Zachariae Isstrom — retreated about 20 kilometers, and regional ice mass loss jumped from zero to roughly 10 metric gigatons a year.

«The Ross ice shelf for instance, is the main outlet for the West Antarctic Ice Sheet, which encompasses several large glaciers and contains the equivalent of five meters of sea level in its perched ice.&raqice shelf for instance, is the main outlet for the West Antarctic Ice Sheet, which encompasses several large glaciers and contains the equivalent of five meters of sea level in its perched ice.&raqIce Sheet, which encompasses several large glaciers and contains the equivalent of five meters of sea level in its perched ice.&raqice.»

However, it is often overlooked that the major ice shelves in the Ross and Weddell Seas and the many smaller shelves and ice tongues buttressing outlet glaciers are also vulnerable to atmospheric warming.»

«It's a major impediment to developing realistic ice sheet models when you don't even know how thick some of these outlet glaciers are,» says Eric Rignot, a remote - sensing glaciologist at the NASA Jet Propulsion Laboratory in Pasadena, California.

Totten Glacier, one of East Antarctica's largest ocean outlets, is already thinning — an ominous sign, since this single glacier drains enough ice to raise the sea level more than all of West Antarctica's ice loss would.

Plant samples preserved underneath these outlet glaciers on Baffin Island in the Canadian Arctic led NSF - funded researchers to conclude that the Earth's Little Ice Age began in 1275 and was triggered by repeated volcanic eruptions that cooled the atmosphere.

The new result focuses on ice loss due to a major retreat of an outlet glacier connected to a long «river» of ice — known as an ice stream — that drains ice from the interior of the ice sheet.

Now, Bindschadler and other researchers are heading out to fetch some of the first temperature data from under the Pine Island Glacier ice shelf, the outlet of one of the largest and fastest moving glaciers in Antarctica, in hopes of understanding what is happening beneath it.

Although that is unlikely to happen for many thousands of years, the ice sheet has increasingly lost mass over the last two decades, and the glaciers that serve as its outlet to the sea are accelerating.

The outlets of glaciers, ice shelves are many hundreds of feet thick, and they are colossal.

That is because they are the only main outlet glaciers of WAIS not buttressed by very large ice shelves.

«As a result of the acceleration of outlet glaciers over large regions, the ice sheets in Greenland and Antarctica are already contributing more and faster to sea level rise than anticipated,» he observed.

Also, the outlet glaciers on Greenland are all variable in flow speed and ice discharge, and I think RC did something before on the acceleration of Jakobshavns Isbrae.

The Greenland, and possibly the Antarctic, ice sheets have been losing mass recently, because losses by ablation including outlet glaciers exceed accumulation of snowfall.

Unlike the great ice sheet of Antarctica, the Greenland ice sheet is melting both on its surface and also at outlet glaciers that drain the ice sheet's mass through deep fjords, where these glaciers extend out into the ocean and often terminate in dynamic calving fronts, giving up gigaton - sized icebergs at times.

With the expertise of Pink Iceland, leave your heels and loafers at home: Using crampons and ice axes, glacier trek through shallow crevasses atop Sólheimajökull outlet glacier in southern Iceland, a rapidly receding glacier set atop Katla, one of the country's most active volcanoes.

The same goes for the snouts of «outlet» glaciers, where ice from the interior funnels through gaps in coastal mountain ranges, and where warming seawater has broken up clots of ice that can hold things up, like a logjam in a river.

The estimated 2010 or 2011 surface mass imbalance (~ 300 Gt / yr) is comparable to the GRACE estimates of the total mass loss (which includes ice loss via dynamic effects such as the speeding up of outlet glaciers) of 248 ± 43 Gt / yr for the years 2005 - 2009 Chen et al, 2011.

Calving from the floating termini of outlet glaciers and ice shelves is just the beginning of an interesting chain of events that can subsequently have important impacts on human life and property.

It is well known that ice shelves on the Antarctic Peninsula have collapsed on several occasions in the last couple of decades, that ice shelves in West Antarctica are thinning rapidly, and that the large outlet glaciers that drain the West Antarctic ice sheet (WAIS) are accelerating.

Overall, I estimate the mass balance of the Greenland ice sheet to be about -80 + / -10 cubic km of ice per year in 2000 and -110 + / -15 cubic km of ice per year in 2004, i.e. more negative than based on partial altimetry surveys of the outlet glaciers.

However, the idea is simple, and I've talked about this much in many presentations this winter: Take the amount of ice you need to get rid of from Greenland to raise sea level 2 m in the next century, reduce it by your best estimate of the amount that would be removed by surface mass balance losses, and try to push the rest out of the aggregate cross-sectional area of Greenland's marine - based outlet glaciers.

However, I've never seen a single media article in any U.S. press outlet that covered these issues — the large - scale evidence for global warming (melting glaciers, warming poles, shrinking sea ice, ocean temperatures) to the local scale (more intense hurricanes, more intense precipitation, more frequent droughts and heat waves) while also discussing the real causes (fossil fuels and deforestation) and the real solutions (replacement of fossil fuels with renewables, limiting deforestation, and halting the use of fossil fuels, especially coal and oil.)

This is in fact increasingly observed around the edges of Greenland and Antarctica in recent years: outlet glaciers and ice streams that drain the ice sheets have greatly accelerated their flow.

So, no new alarm bells this time from the glaciologists, but the uncertainties concerning outlet glaciers and the effects of sea ice retreat are still in the air and imply that sea level rise estimates might need to be reconsidered.

The margins usually slope more steeply, and most ice is discharged through fast - flowing ice streams or outlet glaciers, in some cases into the sea or into ice shelves floating on the sea.

Synchronous retreat and acceleration of southeast Greenland outlet glaciers 2000 — 06: ice dynamics and coupling to climate.Journal of Glaciology, 54 (187).

Near the coast, most of the ice moves through relatively fast - moving outlets called ice streams, glaciers, and ice shelves.

The ice front is not impressive, unlike the faster outlet glaciers.

This image combines two Sentinel - 1A radar scans from 3 and 15 January 2015 to show ice velocities on outlet glaciers of Greenland's west coast.

Changes occurring in marine terminating outlet glaciers of the Greenland Ice Sheet and ice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeIce Sheet and ice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeice sheet - ice shelf systeice shelf systems.

But the results put speculation of monotonic or exponential increases in Greenland's ice discharge to rest, an idea that some had raised after a doubling over a few years was reported in 2004 for Jakobshavn Isbræ (Greenland's largest outlet glacier).

Rapid changes in ice discharge from Greenland outlet glaciers.

Using 10Be surface exposure ages and radiocarbon - dated lake sediments, we constructed a detailed chronology of ice - margin fluctuations over the past 10 k.y. for Jakobshavn Isbræ, Greenland's largest outlet glacier.

Outlet glacier - A glacier issuing from an ice sheet or ice cap from through a mountain pass or valley.

The many fast - moving outlet glaciers around the Greenland coast are constantly calving ice into the ocean, where the melting ice affects sea level.

The heavily crevassed ice on this small Greenland outlet glacier cascades down to the fjord water (bottom right), which is filled with icebergs and small bits of ice.

This small outlet glacier south of Jakobshavn Isbrae is moving ice from the interior of the ice sheet out to the ice sheet edge (top right), where the ice calves off into the ocean.

Carr, J. (2014) Recent retreat of major outlet glaciers on Novaya Zemlya, Russian Arctic, influenced by fjord geometry and sea - ice conditions Journal of Glaciology, Volume 60, pp. 155 - 170 (16)

Greenland's largest outlet glacier, Jakobshavn Isbrae, drains about 7 % of the Greenland ice sheet and generates 10 % of the Atlantic's icebergs.

This relatively small outlet glacier is just one of hundreds (there are many much larger) that move ice from the interior of the Greenland ice sheet out to the ocean.

The Cosgrove Ice Shelf doesn't provide major drainage today for WAIS as it did earlier in the Holocene epoch, but it still has lessons to teach scientists about how outlet glaciers can react when exposed to warmer deep water, she added.

New Study finds West Antarctic Ice Sheet outlet glacier being melted by magma — not co2 global warming after all — Published in the Proceedings of the National Academy of Sciences

Outlet glaciers reaching the ocean can disintegrate in two principal ways: melting by warm waters or by calving ice into the ocean.

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.

Satellite images — comparing average ice loss from 2003 to 2007 with the 2003 - 2009 average — show rapid loss around the perimeter of the ice sheet, reflecting the melting of outlet glaciers.10

Between the fast flowing marine terminating outlet glaciers, the ice sheet particularly in the southwest quadrant has numerous glaciers that terminate on land or in small lakes.

Pine Island Glacier is a giant, an outlet glacier draining about 160,000 km2 of the West Antarctic Ice Sheet.