Greenland model could help estimate sea level rise

February 2, 2016
A tent on the edge of the Jakobshavn Isbræ in Greenland. Credit: Photo by Martin Truffer

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.

These maps use colors to show actual and modeled surface speeds on Greenland's ice sheet. The map on the left, A, reflects speeds observed in 2008-09. The map on the right, B, reflects modeled speeds at a grid resolution of 600 meters. The colored dots around the model map and in the list at right indicate the degree of correlation between the observations and the model's predictions at cross-profiles of 29 outlet glaciers along Greendland's coast. Green dots represent high correlation, while orange dots represent moderate correlation and red dots represents lesser correlation. The smaller inset maps show simulated surface speeds of Jakobshavn Isbræ (C), Kong Oscar Gletscher (D), Kangerdlugssuaq Gletscher (E), and Køge Bugt (F). White lines on the inset maps indicate the position of the cross-profiles. Credit: A. Aschwanden

"The result has been a substantial improvement in our knowledge of subglacial topography, particularly in the deep channels feeding ," 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.

Explore further: Greenland's ice sheet plumbing system revealed

More information: Andy Aschwanden et al. Complex Greenland outlet glacier flow captured, Nature Communications (2016). DOI: 10.1038/ncomms10524

Related Stories

NASA support key to glacier mapping efforts

September 30, 2014

Thanks in part to support from NASA and the National Science Foundation, scientists have produced the first-ever detailed maps of bedrock beneath glaciers in Greenland and Antarctica. This new data will help researchers better ...

Greenland's undercut glaciers melting faster than thought

July 22, 2015

Greenland's glaciers flowing into the ocean are grounded deeper below sea level than previously measured, allowing intruding ocean water to badly undercut the glacier faces. That process will raise sea levels around the world ...

NASA data shed new light on changing Greenland ice

March 10, 2014

Research using NASA data is giving new insight into one of the processes causing Greenland's ice sheet to lose mass. A team of scientists used satellite observations and ice thickness measurements gathered by NASA's Operation ...

Recommended for you

Scientists examine bacterium found 1,000 feet underground

December 8, 2016

Pioneering work being carried out in a cave in New Mexico by researchers at McMaster University and The University of Akron, Ohio, is changing the understanding of how antibiotic resistance may have emerged and how doctors ...

New studies take a second look at coral bleaching culprit

December 7, 2016

Scientists have called superoxide out as the main culprit behind coral bleaching: The idea is that as this toxin build up inside coral cells, the corals fight back by ejecting the tiny energy- and color-producing algae living ...

Cosmic dust found in city rooftop gutters

December 7, 2016

(Phys.org)—A small team of researchers with Imperial College London, the Natural History Museum in London, Project Stardust in Norway and Université Libre de Bruxelles in Belgium, has found samples of cosmic dust in the ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.