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Greenland ice
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Patterns of Greenland ice loss similar to 20 thousand years ago

A new study based on GPS measurements of the Earth's crust suggests that previous calculations of past and present-day mass loss in the Greenland Ice Sheet may have been underestimated.
The latest observations, reported in the journal Science Advances today, reveal that the entirety of Greenland is rising in response to a combination of Glacial Isostatic Adjustment (that is the rise of land due to ice mass loss over the last ~23 thousands years) and the Earth's immediate elastic response to present-day ice-mass loss.

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Scientists have found a surprising mechanism that triggers the abrupt draining of glacial lakes atop the Greenland Ice Sheet.

In 2008 scientists from Woods Hole Oceanographic Institution (WHOI) and the University of Washington documented for the first time how the icy bottoms of lakes atop the Greenland Ice Sheet can crack open suddenly - draining the lakes completely within hours and sending torrents of water to the base of the ice sheet thousands of feet below. Now they have found a surprising mechanism that triggers the cracks.
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Greenland Subglacial Lake
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Subglacial Lakes Seen Refilling in Greenland

Scientists using satellite images and data from NASAs Operation IceBridge have found evidence of a drained and refilled subglacial lake beneath northeastern Greenlands Flade Ice Cap. This sub-ice body of water is only one of a handful that have been detected in Greenland and its presence sheds new light on how the Greenland Ice Sheet reacts to warming temperatures.
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Three-million-year-old landscape still exists beneath the Greenland Ice Sheet

Some of the landscape underlying the massive Greenland ice sheet may have been undisturbed for almost 3 million years, ever since the island became completely ice-covered, according to researchers funded by the National Science Foundation (NSF).
Basing their discovery on an analysis of the chemical composition of silts recovered from the bottom of an ice core more than 3,000 meters long, the researchers argue that the find suggests "pre-glacial landscapes can remain preserved for long periods under continental ice sheets."

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Mega-Canyon Discovered Beneath Greenland Ice

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NASA Data Reveals Mega-Canyon under Greenland Ice Sheet

Data from a NASA airborne science mission reveals evidence of a large and previously unknown canyon hidden under a mile of Greenland ice.
The canyon has the characteristics of a winding river channel and is at least 750 kilometres long, making it longer than the Grand Canyon. In some places, it is as deep as 2,600 feet (800 meters), on scale with segments of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.

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Huge canyon discovered under Greenland ice

One of the biggest canyons in the world has been found beneath the ice sheet that smothers most of Greenland.
The canyon - which is 800km long and up to 800m deep - was carved out by a great river more than four million years ago, before the ice arrived.

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Tracers study reveals rivers beneath the Greenland Ice Sheet

Melt water flow beneath the Greenland Ice Sheet has been traced up to 60km from the ice margin by a team of scientists from the Universities of Bristol, Edinburgh, Aberdeen and Aberystwyth. Their work, which represents the first successful attempt to trace melt water flow through thick ice and over distances of some tens of kilometres on an ice sheet, is published in Nature Geoscience this month.
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Deep ice cores show past Greenland warm period may be 'road map' for continued warming of planet

A new study by an international team of scientists analysing ice cores from the Greenland ice sheet going back in time more than 100,000 years indicates the last interglacial period may be a good analogue for where the planet is headed in terms of increasing greenhouse gases and rising temperatures.
The new results from the NEEM deep ice core drilling project led by the University of Copenhagen and involving the University of Colorado Boulder show that between 130,000 and 115,000 years ago during the Eemian interglacial period, the climate in north Greenland rose to about 14 degrees Fahrenheit warmer than today. Despite the strong warming signal during the Eemian -- a period when the seas were roughly 15 to 25 feet higher than today -- the surface of the north Greenland ice sheet near the NEEM facility was only a few hundred yards lower than it is today, an indication to scientists it contributed less than half of the total sea rise at the time.

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Greenland ice core shows significantly higher temperatures than 120,000 years ago today

New insights into the last interglacial period in Greenland - mainly through the temperature and the thickness of the ice - could serve as a comparison of how the Greenland ice sheet developed in the future. 
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