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ICE WORLD
Greenland model could help estimate sea level rise
by Staff Writers
Fairbanks AK (SPX) Feb 04, 2016


This image shows a tent on the edge of the Jakobshavn Isbrae in Greenland. Image courtesy Martin Truffer. For a larger version of this image please go here.

University of Alaska Fairbanks mathematicians and glaciologists have taken a first step toward understanding how glacier ice flowing off Greenland affects sea levels.

Andy Aschwanden, Martin Truffer and Mark Fahnestock used mathematical computer models and field tests to reproduce the flow of 29 inlet glaciers fed by the Greenland ice sheet. They compared their data with data from NASA's Operation IceBridge North aerial campaign.

The comparisons showed that the computer models accurately depicted current flow conditions in topographically complex Greenland.

The work by the three researchers, all with UAF's Geophysical Institute, is featured in the latest edition of Nature Communications.

The time was right for the comparison, said Truffer, a physicist in the Geophysical Institute's Glaciers Group.

"Better computer models and NASA's high resolution data set made the difference," he said. "Each part needed each other to make sense. It couldn't have happened without either."

The work has taken over a decade, hindered by the ability to understand the thickness of Greenland ice. The NASA campaign provided that information, using an advanced ice-penetrating radar developed by the University of Kansas Center.

"The result has been a substantial improvement in our knowledge of subglacial topography, particularly in the deep channels feeding outlet glaciers," the three wrote in the Nature Communications article.

The three now want to see if the model can accurately predict how sea levels might be affected by a melting Greenland ice sheet.

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Related Links
University of Alaska Fairbanks
Beyond the Ice Age






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Previous Report
ICE WORLD
Melting Greenland ice sheet may affect global ocean circulation, future climate
Tampa FL (SPX) Jan 26, 2016
Scientists from the University of South Florida, along with colleagues in Canada and the Netherlands, have determined that the influx of fresh water from the Greenland ice sheet is "freshening" the North Atlantic Ocean and could disrupt the Atlantic Meridional Overturning Circulation (AMOC), an important component of global ocean circulation that could have a global effect. Researchers say it co ... read more


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