According to a new study co-authored by Earth Sciences Professor Michael Bevis, the Greenland ice sheet did not lose approximately 2,500 gigatons of ice from 2003-2013 as previously thought -- the number is actually around 2,700 gigatons of ice. "We've underestimated the rate of ice loss by about 7.6 per cent," said Bevis. Teams of scientists spent years installing GPS stations along the perimeter of the Greenland ice sheet, and this on-site data helped scientists be able to discern between movement caused by recent ice loss and movement caused by ice loss thousands of years ago. These measurements help scientists figure out just how much ice was lost since the last glaciation period, and what that means for the future.
For more information about this study, check out the article by CBC News's Sima Zeheri here: http://www.cbc.ca/news/canada/north/greenland-ice-sheet-melting-faster-gps-study-1.3772685
You can view the full study published in Science Advances here: http://advances.sciencemag.org/content/2/9/e1600931