Matthew Osman drilling ice cores (IMAGE) University of Arizona Caption University of Arizona postdoctoral research associate Matthew Osman steadies an ice core drilling barrel into the Greenland Ice Sheet snow surface. Credit Sarah Das/Woods Hole Oceanographic Institution Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. License Original 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.