
The calving front of Thwaites Ice Shelf in 2012. Photo by JamesYungel | NASA IceBridge.
The continued rapid melting of Antarctica’s Thwaites glacier is worrying, at the very least. The glacier was dubbed “The Doomsday Glacier” by an article in Rolling Stone magazine in 2017. At 80 miles across, Thwaites is the widest glacier in the world—roughly the size of Florida. Every year, it loses 50 billion tons of ice, contributing around 4 percent of annual global sea level rise. If the entire glacier were to melt, it would raise the ocean by 25 inches.
Last September, we saw a blizzard of scary headlines announcing that the doomsday glacier was “holding on by its fingernails,” inspired by a statement by the British Antarctic Survey’s Robert Larter, who said, “Thwaites is really holding on today by its fingernails, and we should expect to see big changes over small time scales in the future — even from one year to the next — once the glacier retreats beyond a shallow ridge in its bed.”
This month, new research by the British Antarctic Survey and the US Antarctic program concluded that Antarctic glaciers may be more sensitive to changes in sea temperature than was thought. The new research suggests that even low amounts of melting can potentially push a glacier further along the path toward eventual disappearance.