Dynamic ice loss from the Greenland Ice Sheetdriven by sustained glacier retreat
by Michalea D. King, Ian M. Howat, Salvatore G. Candela, Myoung J. Noh, Seonsgu Jeong, Brice P. Y. Noël, Michiel R. van den Broeke3, Bert Wouters, Adelaide Negrete
The Greenland Ice Sheet is losing mass at accelerated rates in the 21st century, making it thelargest single contributor to rising sea levels. Fasterflow of outlet glaciers has substantiallycontributed to this loss, with the cause of speedup, and potential for future change, uncertain.
“The ice sheet is now in this new dynamic state, where even if we went back to a climate that was more like what we had 20 or 30 years ago, we would still be pretty quickly losing mass,” Ian Howat, co-author of the study and a professor at Ohio State University, said.
CNN reports, “Sea levels are projected to rise by more than 3 feet by the end of the century, wiping away beaches and coastal properties. Coastal states like Florida, and low-lying island nations are particularly vulnerable. Just 3 feet of sea level rise could put large areas of coastline underwater. Forty percent of the US population resides in coastal areas that are vulnerable to sea level rise.”
“There’s a lot of places, like in Florida especially, where one meter alone would cover a lot of existing land areas,” King said. “And that’s exacerbated when you get storms and hurricanes and things like that, that then cause extra surge on top of a higher baseline.”
“We’ve passed the point of no return but there’s obviously more to come,” Howat said. “Rather than being a single tipping point in which we’ve gone from a happy ice sheet to a rapidly collapsing ice sheet, it’s more of a staircase where we’ve fallen off the first step but there’s many more steps to go down into the pit.”
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