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"It's a remarkably rapid rate of change," Jay Austin, an assistant professor with the university's Large Lakes Observatory and Department of Physics, told the Star Tribune newspaper. Austin co-authored the study with geology professor Steve Colman.
The study is based on data collected by National Oceanic and Atmospheric Administration buoys on the lake and on 102 years' worth of daily temperature readings at a hydroelectric plant near Sault Ste. Marie, Michigan.