Section of Denali Ice Core (IMAGE) Dartmouth College Caption Ice cores from Mount Hunter in Alaska’s Denali National Park and Mount Logan in Canada were used in an analysis of over 1,000 years of history of the Aleutian Low pressure system that drives storm activity in the North Pacific. Credit Bradley Markle 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.