Runaway West Antarctic ice retreat can be slowed by climate-driven changes in ocean temperature. New research finds that ice-sheet-wide collapse in West Antarctica isn’t inevitable: the pace of ice loss varies according to regional differences in atmosphere and ocean circulation. An internatio
, found that the pace and extent of ice destabilization along West Antarctica’s coast varies according to differences in regional climate., show that while the West Antarctic Ice Sheet continues to retreat, the pace of retreat slowed across a vulnerable region of the coastline between 2003 and 2015. This slowdown was driven by changes in surrounding ocean temperature, which were in turn caused by variations in offshore wind conditions.
Other scientists have previously indicated that this type of response across a low-lying landmass could be the onset of an irreversible, ice-sheet-wide collapse called a marine ice sheet instability, which would continue independently of any further climatic influence. By analyzing climate and ocean records, the researchers linked these regional differences to changes in the strength and direction of offshore surface winds.
“But between 2003 and 2015 offshore of the Amundsen Sea Sector, the intensity of the prevailing westerly winds reduced,” said Christie. “This meant that the deeper, warmer water couldn’t intrude, and we saw a notable change in corresponding glacier behavior along the region: a clear reduction in the rate of melt and ice-mass loss.”
Ultimately, the study illustrates the complexity of the competing ice, ocean, and atmosphere interactions driving short-term changes across West Antarctica, and raises important questions about how quickly the icy continent will evolve in a warming world.
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