The Greenland and Antarctic ice sheets are now losing more than three times as much ice a year as they were 30 years ago, according to a new comprehensive international study.
“This is a devastating trajectory,” said U.S. National Snow and Ice Center Deputy Lead Scientist Twila Moon, who wasn’t part of the study. “These rates of ice loss are unprecedented during modern civilization.”
But because the world’s oceans are so huge, the melt just from the ice sheets since 1992 still only adds up to a little less than inch of sea level rise, on average. Globallyand melt from ice sheets has gone from contributing 5% of the sea level rise to now accounting for more than one-quarter of it, the study said. The rest of the sea rise comes from warmer water expanding and melt from glaciers.
The latest figures also showed what looks like a slowing of melting in parts of Antarctica, which has much more ice than Greenland. That’s mostly due to smaller and fleeting weather changes and the overall longer-term trend still shows an acceleration of melting in Antarctica, Mottram said. “While mass loss from Greenland is outpacing that from Antarctica, there are troublesome wild cards in the south, notably behavior of the Thwaites glacier,” which issaid Mark Serreze, director of the U.S. snow and ice center, who wasn’t part of the study.
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