Hidden warm water beneath Antarctica could rapidly raise global sea levels

Global sea levels could rise faster than scientists once predicted, according to new research pointing to a hidden source of Antarctic ice loss. The study suggests that warmer ocean water is melting Antarctic ice shelves from underneath much more efficiently than expected.

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Scientists have already seen similar patterns in other parts of Antarctica. The Intergovernmental Panel on Climate Change (IPCC) has identified unstable polar ice shelves as a major climate concern, although the process remains difficult to fully understand and model.

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Researchers found that melting rates inside these channels can increase by roughly an order of magnitude locally. In simple terms, the shape of the ice shelf determines where ocean heat gathers and how much melting it can trigger.

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The findings could have major implications for climate science and coastal planning. Researchers say ice sheet and climate models need to better account for these small-scale melting processes to improve future sea level projections. The changing flow of meltwater could also affect ocean circulation and marine ecosystems around Antarctica.