Arctic sea ice (IMAGE) American Geophysical Union Caption New estimates of snow depth, from a combination of lidar and radar, improve sea-ice thickness estimates, according to a new study in AGU’s Geophysical Research Letters. Arctic sea ice has lost 16% of its thickness in the last three years, the study finds. Credit NASA/Kathryn Hansen Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.