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Greenland will be far greater contributor to sea rise than expected: Work reveals long, deep valleys connecting ice cap to ocean

Date:
May 18, 2014
Source:
University of California - Irvine
Summary:
Greenland's icy reaches are far more vulnerable to warm ocean waters from climate change than had been thought, according to new research by glaciologists. The work shows previously uncharted deep valleys stretching for dozens of miles under the Greenland Ice Sheet.

Aerial view of greenland ice sheet.
Credit: Wollwerth Imagery / Fotolia

Greenland's icy reaches are far more vulnerable to warm ocean waters from climate change than had been thought, according to new research by UC Irvine and NASA glaciologists. The work, published today in Nature Geoscience, shows previously uncharted deep valleys stretching for dozens of miles under the Greenland Ice Sheet.

The bedrock canyons sit well below sea level, meaning that as subtropical Atlantic waters hit the fronts of hundreds of glaciers, those edges will erode much further than had been assumed and release far greater amounts of water.

Ice melt from the subcontinent has already accelerated as warmer marine currents have migrated north, but older models predicted that once higher ground was reached in a few years, the ocean-induced melting would halt. Greenland's frozen mass would stop shrinking, and its effect on higher sea waters would be curtailed.

"That turns out to be incorrect. The glaciers of Greenland are likely to retreat faster and farther inland than anticipated -- and for much longer -- according to this very different topography we've discovered beneath the ice," said lead author Mathieu Morlighem, a UCI associate project scientist. "This has major implications, because the glacier melt will contribute much more to rising seas around the globe."

To obtain the results, Morlighem developed a breakthrough method that for the first time offers a comprehensive view of Greenland's entire periphery. It's nearly impossible to accurately survey at ground level the subcontinent's rugged, rocky subsurface, which descends as much as 3 miles beneath the thick ice cap.

Since the 1970s, limited ice thickness data has been collected via radar pinging of the boundary between the ice and the bedrock. Along the coastline, though, rough surface ice and pockets of water cluttered the radar sounding, so large swaths of the bed remained invisible.

Measurements of Greenland's topography have tripled since 2009, thanks to NASA Operation IceBridge flights. But Morlighem quickly realized that while that data provided a fuller picture than had the earlier radar readings, there were still major gaps between the flight lines.

To reveal the full subterranean landscape, he designed a novel "mass conservation algorithm" that combined the previous ice thickness measurements with information on the velocity and direction of its movement and estimates of snowfall and surface melt.

The difference was spectacular. What appeared to be shallow glaciers at the very edges of Greenland are actually long, deep fingers stretching more than 100 kilometers (almost 65 miles) inland.

"We anticipate that these results will have a profound and transforming impact on computer models of ice sheet evolution in Greenland in a warming climate," the researchers conclude.

"Operation IceBridge vastly improved our knowledge of bed topography beneath the Greenland Ice Sheet," said co-author Eric Rignot of UC Irvine and NASA's Jet Propulsion Laboratory. "This new study takes a quantum leap at filling the remaining, critical data gaps on the map."

Video: http://www.youtube.com/watch?v=g_6a7SloMsY&feature=youtu.be


Story Source:

The above story is based on materials provided by University of California - Irvine. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. Morlighem, E. Rignot, J. Mouginot, H. Seroussi, E. Larour. Deeply incised submarine glacial valleys beneath the Greenland ice sheet. Nature Geoscience, 2014; DOI: 10.1038/ngeo2167

Cite This Page:

University of California - Irvine. "Greenland will be far greater contributor to sea rise than expected: Work reveals long, deep valleys connecting ice cap to ocean." ScienceDaily. ScienceDaily, 18 May 2014. <www.sciencedaily.com/releases/2014/05/140518164423.htm>.
University of California - Irvine. (2014, May 18). Greenland will be far greater contributor to sea rise than expected: Work reveals long, deep valleys connecting ice cap to ocean. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2014/05/140518164423.htm
University of California - Irvine. "Greenland will be far greater contributor to sea rise than expected: Work reveals long, deep valleys connecting ice cap to ocean." ScienceDaily. www.sciencedaily.com/releases/2014/05/140518164423.htm (accessed September 30, 2014).

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