* Astronomy

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RE: Greenland

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Supra-glacial lakes focus of study

Rising temperatures on the Greenland ice sheet cause the creation of large surface lakes called supra-glacial lakes. Now a Penn State geographer will investigate why these lakes form and their implications.
NASA awarded Derrick Lampkin, assistant professor of geography, almost $300,000 over three years to look at these lakes.
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Greenland ice sheet

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The Greenland ice sheet is losing its mass faster than in previous years and making an increasing contribution to sea level rise, a study has confirmed.
Published in the journal Science, it has also given scientists a clearer view of why the sheet is shrinking.

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RE: Greenland

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There have been many reports in the media about the effects of global warming on the Greenland ice-sheet, but there is still great uncertainty as to why there is an ice-sheet there at all.
Reporting today in the journal Nature, scientists at the University of Bristol and the University of Leeds show that only changes in atmospheric carbon dioxide are able to explain the transition from the mostly ice-free Greenland of three million years ago, to the ice-covered Greenland of today

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Researchers monitoring daily satellite images here of Greenlands glaciers have discovered break-ups at two of the largest glaciers in the last month.
They expect that part of the Northern hemispheres longest floating glacier will continue to disintegrate within the next year.
A massive 29-square-kilometer piece of the Petermann Glacier in northern Greenland broke away between July 10th and by July 24th. The loss to that glacier is equal to half the size of Manhattan Island. The last major ice loss to Petermann occurred when the glacier lost 86 square kilometres of floating ice between 2000 and 2001.
Petermann has a floating section of ice 16 kilometres wide and 80.4 kilometres long which covers 1,295 square kilometres.

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A new approach to measuring glacier behaviour can keep track of the rapidly changing erosion of ice in south-east Greenland.

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In late July 2006, a 2.2-square-mile lake atop the Greenland Ice Sheet sprung a leak. Like a draining bathtub, the entire lake emptied from the bottom, sending water through a crack that reached the base of the ice sheet 3,215 feet below. Most of the 11.6 billion gallons of water in the lake drained out in 90 minutesat times flowing out faster than the water going over Niagara Falls.

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Blobrana · L

Global warming may not be the only thing melting Greenland. Scientists have found at least one natural magma hotspot under the Arctic island that could be pitching in.
In recent years, Greenlands ice has been melting more and flowing faster into the sea a record amount of ice melted from the frozen mass this summer, according to recently released data and Earths rising temperatures are suspected to be the main culprit.

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