UPDATED: Arctic Amplification UPDATED: Winter Storm Risk Increase Greenland Mass Variation Since 2002 by NASA / GRACE satellite data Data from NASA's GRACE satellites show that the land ice sheets in both Antarctica and Greenland are losing mass. The Greenland ice sheet has been losing an estimated 287 gigatonnes per year. Click through to the site for the latest data. Go to Site Related Events Greenland Ice Sheet Melt 2007 - Related Climate Signals Glacier and Ice Sheet Melt