Probing Permafrost (IMAGE) University of Colorado at Boulder Caption Postdoctoral fellow Catherine Dielemen associated with Merritt Turetsky's research group uses a frost probe to determine the location of surface permafrost beneath the ground surface in interior Alaska. Credit Merritt Turetsky 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.