Sea Ice in the Nordic Seas (IMAGE) University of Copenhagen Caption "We have investigated how the sea ice cover changed during the last glacial period in both marine cores and ice cores," says Helle Astrid Kjær, Associate Professor at the Niels Bohr Institute, University of Copenhagen. Credit University of Copenhagen 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.