June 11, 2008

FRESHWATER RUNOFF FROM THE GREENLAND ICE SHEET WILL MORE THAN DOUBLE BY THE END OF THE CENTURY

The Greenland Ice Sheet is melting faster than previously calculated according to a scientific paper by University of Alaska Fairbanks researcher Sebastian H. Mernild published recently in the journal "Hydrological Processes."

The study is based on the results of state-of-the-art modeling using data from the Intergovernmental Panel on Climate Change as well as satellite images and observations from on the ground in Greenland.

Mernild and his team found that the total amount of Greenland Ice Sheet freshwater input into the North Atlantic Ocean expected from 2071 to 2100 will be more than double what is currently observed. The current East Greenland Ice Sheet freshwater flux is 257 cubic kilometers [62 cubic miles] per year from both runoff and iceberg calving. This freshwater flux is estimated to reach 456 cubic kilometers [109 cubic miles] by 2100.

Mernild's results further show a change in total East Greenland freshwater flux from today's values of 438 cubic kilometers [105 cubic miles] per year to 650 cubic kilometers [156 cubic miles] per year by 2100. This indicates an increase in global sea level rise estimates from 1.1 millimeters [0.1 centimeters] per year to 1.6 millimeters [0.16 centimeters] per year.

"The Greenland Ice Sheet mass balance is changing as a response to the altered climatic state," said Mernild. "This is faster than expected. This affects freshwater runoff input to the North Atlantic Ocean, and plays an important role in determining the global sea level rise and global ocean thermohaline circulation."

Mernild is conducting the research as part of the University of Alaska's International Polar Year efforts. He was appointed a University of Alaska IPY postdoctoral fellow by UA president Mark Hamilton in 2007.

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Contact:

Jenn Wagaman
University of Alaska Fairbanks
907-474-5082
jenn@alaska.edu

This text derived from:
http://www.alaska.edu/ipy/press/stories/mernild.xml

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