Twice the loss: New research on Antarctica doubles the previous estimates of loss from ice shelves and details how the continent is changing ~ ~ climate
New research on Antarctica, including the first map of iceberg calving, doubles the previous estimates of loss from ice shelves and details how the continent is changing.
Changes in elevation of the Antarctic ice sheet from 1985 to 2021 are shown. Ice height diminishes as the ice sheet melts by contact with ocean water; it rises where accumulation exceeds melting. Ice shelves are shown in gray. The missions that supplied data are listed at bottom.“Antarctica is crumbling at its edges,” says JPL scientist Chad Greene, lead author of the calving study.
That’s partly because satellite imagery has been challenging to interpret, says Greene. “For example, you can imagine looking at a satellite image and trying to figure out the difference between a white iceberg, white ice shelf, white sea ice, and even a white cloud. That’s always been a difficult task. But we now have enough data from multiple satellite sensors to see a clear picture of how Antarctica’s coastline has evolved in recent years.
The unparalleled detail in the new record reveals how long-term trends and annual weather patterns affect the ice. It even shows the rise and fall of the ice sheet as subglacial lakes regularly fill and empty miles below the surface.
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