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Date Time Glaciologists measure, model hard glacier beds, write slip law to estimate glacier speeds Researchers measure the topography of an exposed glacier bed at Castleguard Glacier in the Rocky Mountains of Alberta, Canada. Larger photo. Photo by Keith Williams, contributed by Christian Helanow. AMES, Iowa – The field photos show the hard, rough country that some glaciers slide over: rocky domes and bumps in granite, rocky steps and depressions in limestone. The glacier beds dwarf the researchers and their instruments. (As do the high mountains pictured on the various horizons.) During their trips to glacier beds recently exposed by retreating glaciers in the Swiss Alps (Rhone, Schwarzburg and Tsanfleuron glaciers) and the Canadian Rockies (Castleguard Glacier), four glaciologists used laser and drone technology to precisely measure the rocky beds and record their very different contours.

United statesIowa state universityUniversity of wisconsinNeal iversonLucas zoetKeith williamsChristian helanowJacob woodardStockholm universityNational science foundationCastleguard glacierRocky mountainsSwiss alpsCanadian rockiesIowa stateScience advances