image: A small cirque glacier feeds meltwater into Upper Greyling Lake in south-central Alaska. The former extent of the glacier can be reconstructed from the sharp-crested ridges of debris (lateral moraines) that descend into the lake and mark the former margins of the glacier during the ‘Little Ice Age’. Combining the geomorphic evidence for glacier fluctuations with lake-core evidence for sedimentological changes provides a robust interpretation of past climate change. (July 2006) This image relates to an article that appeared in the Sept. 4 issue of Science, published by AAAS. The study, by Dr. D.S. Kaufman at Northern Arizona University in Flagstaff, Ariz., and colleagues, was titled, "Recent Warming Reverses Long-Term Arctic Cooling." view more
Credit: Image courtesy of Darrell Kaufman, Northern Arizona University