Abstract
Sonar maps of the underside of polar‐ice flow have been made by three scientists from the University of Wisconsin Geophysical and Polar Research Center in Madison. Clarence S. Clay, Jonathan M. Berkson, and Tze Kong Kan used a sonar device to record the under‐ice topography last spring. They currently are comparing their findings with aerial photographs to determine how features below the ice are related to those above.According to Clay, this, information has a number of possible applications. Researchers will be able to better predict the drift of polar ice, and ice breaker crews will be able to locate thick areas of ice. Also, submarine personnel can use sonar information to determine weak ice spots where they can surface. So far, a feature which protrudes above the ice seems to have a related protrusion below. He expects that after further analysis the UW group will be able to predict fairly accurately the topography of undersea ice by knowing what is on top.
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