Sentences with phrase «glaciers retreated from»

There is evidence, for example, that Mt. Rainier experienced this following the last glacial maximum, as the large glaciers retreated from it's flanks.

Not exact matches

Using data from NASA missions observing Earth, researchers at the University of California, Irvine have created new maps of the bed topography beneath a score of glaciers in southeast Greenland, thereby gaining a much better understanding of why some are undergoing rapid retreat and others are relatively stable.

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.

Today, as warming waters caused by climate change flow underneath the floating ice shelves in Pine Island Bay, the Antarctic Ice Sheet is once again at risk of losing mass from rapidly retreating glaciers.

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.

Thousands of marks on the Antarctic seafloor, caused by icebergs which broke free from glaciers more than ten thousand years ago, show how part of the Antarctic Ice Sheet retreated rapidly at the end of the last ice age as it balanced precariously on sloping ground and became unstable.

This exposed tall ice «cliffs» at their margin with an unstable height, and resulted in rapid retreat of the glaciers from marine ice cliff instability between 12,000 and 11,000 years ago.

«Today, the Pine Island and Thwaites glaciers are grounded in a very precarious position, and major retreat may already be happening, caused primarily by warm waters melting from below the ice shelves that jut out from each glacier into the sea,» said Matthew Wise of Cambridge's Scott Polar Research Institute, and the study's first author.

Some of Alaska's glaciers, in fact, have retreated so far from the sea that they no longer calve.

But scientists increasingly attribute much of the observed grounding line retreat — particularly in West Antarctica — to the influence of warmer ocean water seeping beneath the ice shelves and lapping against the bases of glaciers, melting the ice from the bottom up.

After a brief respite, the Younger Dryas, between 12,800 to 11,500 years ago, froze Europe solid within a matter of months — probably as a result of meltwater from retreating glaciers shutting down the Atlantic Ocean's «conveyor - belt» current, although a cometary impact has also been blamed.

They found that most of the DNA in living Europeans originated in three major migrations, starting with hunter - gatherers who came from the Middle East as the glaciers retreated 19,000 to 14,000 years ago.

In October 2015, he and two collaborators resubmitted a previously rejected proposal to the geomorphology program: a $ 265,000, 3 - year request to study the thinning of glaciers that retreated from New England within the last 20,000 years.

To study the advance and retreat of glaciers over nearly 10,000 years, scientists extracted sediment cores from the bottom of glacier - fed Kulusuk Lake in southeast Greenland.

When the glacier starts to retreat, the frontal moraines are no longer protected by the ice, and a sort of «geological chronometer» is triggered, as the rocks begin to accumulate beryllium - 10 and helium - 3 produced by particles resulting from cosmic rays.

About 10,000 years ago, after the glaciers of the Ice Age retreated from the Scandinavian landmass, bands of hunters and fishers moved across the Baltic Sea and into the Finnish wilderness.

Meltwater from retreating glaciers, seasonal snowfall and rain carried topsoil and sand from as far away as the Canadian prairies.

Using marine seismic technology deployed from an icebreaker, researchers were able to reconstruct how glaciers on the Sabrina Coast have advanced and retreated during the past 50 million years.

Zachariæ Isstrøm, a large glacier in northeast Greenland, began a rapid retreat after detaching from a stabilizing sill in the late 1990s.

If these glaciers retreat at a similar rate to what they did in the past decade, 30 of them would disconnect from warm ocean waters by the end of the century with that kind of travel distance, it says.

Warmer air and ocean temperatures have caused the glacier to detach from a stabilizing sill and retreat rapidly along a downward - sloping, marine - based bed.

And she describes sobering trends: The projection that Switzerland will lose more than half of its small glaciers in the next 25 years; the substantial retreat of glaciers from the Antarctic, Patagonia, the Himalayas, Greenland and the Arctic; the disappearance of iconic glaciers in Glacier National Park, Montana, or reduction to chunks of ice that no longer move (by definition, a glacier must be massive enough to move).

By 1900, increased emissions of soot could have triggered the loss of more than 15 m of ice from a glacier's surface; by 1930, the loss could have totaled 30 m or more — magnitudes and timing that can easily account for the Alpine glacial retreat, the scientists contend.

A glaciologist doesn't let a heart transplant keep him from braving dizzying altitudes to gather crucial ice core samples from retreating tropical and subtropical glaciers

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.

Glaciers on the Antarctic peninsula, which protrudes from the continent to the north, were already known to be retreating.

From satellite observations such as radar interferometry, Rignot and his colleagues conclude a common cause underlies the retreat of West Antarctica's largest glaciers, including Pine Island Glacier, known for cleaving massive icebergs, and its neighbor, Thwaites Glacier.

I seem also to remember a comment by Bindschadler stating that while GIS glaciers could retreat inland from warming oceans, there could be no similar escape for Antatctica.

Evidence from glacial advance / retreat (e.g. the evidence from tropical Andean glaciers you cite above) is often difficult to interpret, because glacial mass balance represents in general a subtle competition between the influences of ablation (determined by changes in temperature thresholds reached) and accumulation (determined by changes in humidity and precipitation).

Analysis of the data reveals that 87 % of glaciers have retreated (click on the image for a more detailed figure) and that the change from advance to retreat has occurred progressively with latitude.

In 1950s only the most northerly glaciers appeared to be retreating, but a transition from advance to retreat appeared to move down the Antarctic Peninsula over a period of about 10 to 20 years, broadly in line with what we would expect if this was a consequence of the warming that has been measured in this area.

The second error is obvious from the fact that the recent warming is seen in the oceans, the atmosphere, in Arctic sea ice retreat, in glacier recession, earlier springs, reduced snow cover etc., so even if all met stations were contaminated (which they aren't), global warming would still be «unequivocal».

In the somewhat good news department, the new study shows that Pine Island Glacier, the fastest - shrinking glacier on the planet, has actually seen its grounding line retreat slow down markedly compared to measurements taken from 1992 - 2011.

NOAA has a nice visual of the recession of the Jakobshavn glacier which RC posted here: http://www.realclimate.org/images/jakobshavn.jpg There was a rather large retreat from 1851 until 1913, then slowing until 2001, with a recent acceleration.

Warm waters have been eating away at ice from below in this region, and once grounding lines retreat far enough inland, entire glaciers can become unstable and collapse.

In pointing out the significance of the above findings, it is important to note that, over a period of time in which the bulk of the modern rise in atmospheric CO2 has occurred, not only have the majority of glaciers from this large region of Antarctica not retreated, they have collectively grown!

For example, scientists know that once giant glaciers begin to retreat, in some parts of the world simple geography dictates nothing can stop them from melting into the sea.

More specifically, using digital scans of paper maps based on aerial imagery acquired by the U.S. Geological Survey, along with modern - day satellite imagery from a variety of platforms, the authors digitized a total of 49 maps and images from which they calculated changes in the terminus positions, ice speed, calving rates and ice front advance and retreat rates from 34 glaciers in this region over the period 1955 - 2015.

Orlowski's documentary profiles famed environmental photographer James Balog who, together with a small and dedicated team, has sought to capture on film the retreat of Earth's glaciers using an army of time - lapse cameras positioned across the globe — from Alaska and Glacier National Park in Montana to Iceland and Greenland.

The Tongariro Alpine Crossing, named by Lonely Planet as one of the Top 10 World Parks, simmers with andesitic volcanoes, freezing crater lakes and retreating glaciers from the ice age.

Overlooking the shores of the magnificent glacier - carved fjord of Hood Canal, Alderbrook Resort & Spa is luxurious spa retreat surrounded by the Olympic Mountains and just two hours» drive from Seattle.

Historic photos and maps (from the 1800's to present) indicate a long term retreat of ice calving fronts on Greenland's glaciers.

This paper has played a valuable role in calling attention to important work on the physics of tropical glaciers, that can help in teasing out the record of tropical climate change from glacier retreat data.

Analysis of the data reveals that 87 % of glaciers have retreated and that the change from advance to retreat has occurred progressively with latitude.

I seem also to remember a comment by Bindschadler stating that while GIS glaciers could retreat inland from warming oceans, there could be no similar escape for Antatctica.

A question that arose in subsequent online discussion was to what extent Oerlemans had relied on glaciers from tropical regions (answer: he didn't), and what the reasons are behind retreat of glaciers in these regions.

And what about the hockey stick that Oerlemans derived from glacier retreat since 1600?

Data from the tropical and subtropical Andes suggest that changes in precipitation and cloud cover in the latter portion of the 20th century are minor, and that changes in these quantities are unlikely candidates for explaining Andes glacier retreat.

This is quite a shift from his chiding tone last November when the Indian government endorsed a report questioning the panel's 2007 conclusions on the retreat of Himalayan glaciers.

The second error is obvious from the fact that the recent warming is seen in the oceans, the atmosphere, in Arctic sea ice retreat, in glacier recession, earlier springs, reduced snow cover etc., so even if all met stations were contaminated (which they aren't), global warming would still be «unequivocal».