Nature Climate Change, Published online: 27 February 2026; doi:10.1038/s41558-026-02568-2Melting beneath floating Antarctic ice shelves is a major driver of ice-shelf mass loss and is projected to increase over the coming century. High-resolution maps of Antarctic basal-melt rates reveal stronger melt within narrow basal channels than previously recognized, making some ice shelves more vulnerable to additional melt channelization.
BackMelt channelization stronger than previously recognized
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Ecosystem Impact
Enhanced melt channelization accelerates the transport of surface meltwater to the ice-bed interface and the ocean, leading to more rapid ice sheet thinning and mass loss. This increased freshwater flux into saline marine environments disrupts local fjord ecosystems, alters nutrient cycling, and threatens cryosphere-dependent biodiversity by destabilizing physical habitats faster than biological adaptation can occur.
Systemic Reality
The realization that subglacial drainage is more efficient than previously modeled indicates that current IPCC sea-level rise projections may be conservative. This necessitates a downward revision of coastal property valuations, a recalibration of global insurance risk premiums, and an urgent acceleration of municipal adaptation timelines as the window for infrastructure fortification narrows due to higher-than-expected melt rates.
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