Trillions of Tons of Antarctic Ice Have Been Lost, Scientists Find

This satellite image provided by NASA, shows icebergs that formed through an ice shelf collapse. Dozens of Antarctica’s ice shelves, floating extensions of glaciers, showed significant shrinking between 1997 and 2021, a study published Oct. 12, 2023, found.

our dozen Antarctic ice shelves have shrunk by at least 30% since 1997 and 28 of those have lost more than half of their ice in that time, reports a new study that surveyed these crucial “gatekeepers’’ between the frozen continent’s massive glaciers and open ocean.

Ice shelves are floating extensions of glaciers that act “like the gatekeepers” and keep the larger glacier from flowing more quickly into the water, the study’s lead author said. What’s most important, he said, are the patterns of individual shelf loss. The new study shows the deep losses, with four glaciers losing more than a trillion tons on the continent’s peninsula and western side.

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