EurekAlert: "Upside-down rivers" of warm ocean water threaten the stability of floating ice shelves in Antarctica, according to a new study led by researchers at the University of Colorado Boulder's National Snow and Ice Data Center published today in Nature Geoscience. The study highlights how parts of Antarctica's ice sheet may be weakening due to contact with warm ocean water. "We found that warm ocean water is carving these 'upside-down rivers,' or basal channels, into the undersides of ice shelves all...