Antarctica's 'Doomsday Glacier' Melting At Fastest Rate In 5,500 Years

Two major glaciers in Antarctica may be shedding ice faster now than they have at any point in the past 5,500 years, new research suggests. The melting ice could lead to more than 11 feet of global sea level rise in the next several centuries, according to a new study published in Nature Geoscience. Smithsonian Magazine reports: Scientists studied both the Thwaites Glacier (nicknamed the "Doomsday Glacier" for the potentially devastating impacts if it melts) and the neighboring Pine Island Glacier on the western side of the continent, which are both vulnerable to melting from warm water flowing underneath them. The researchers analyzed penguin bones and seashells from ancient Antarctic beaches using radiocarbon dating to reconstruct changes in sea level relative to the coast over 5,000 years, per the statement. Scientists also studied the shifting height of the land under the changing loads of ice to see how glaciers retreated and advanced. Larger, heavier glaciers can cause the land to sink and sea level relative to the coast to rise and lighter glaciers can lead the land to rise and sea level relative to the coast to fall. The researchers found that from about 5,000 years ago until 30 years ago, sea level relative to the coast fell at a steady rate consistent with stable glacial behavior. But in the past thirty years, relative sea level fall was almost five times lower, most likely because of rapid loss of glacial ice that led the earth to rise, per the study. On top of that, because the glaciers rest on a slope with no known highs, no topographic features will help stabilize the glacier where it is, potentially leading to runaway melting.

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