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Thwaites Glacier Melting Much Faster, New Study Warns

Underwater melting could double sea level contribution to 30mm by 2100

By LineZotpaper
Published
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New research published in Nature Communications has found that the Thwaites Glacier in West Antarctica is losing mass significantly faster than previously estimated. A team from the University of California and NASA's Jet Propulsion Laboratory discovered that warm seawater is intruding beneath the glacier, melting it from its core. This mechanism could add 1.2 inches (30 millimeters) to global sea levels over the next century, roughly double what earlier models predicted.

Known colloquially as the 'Doomsday Glacier', Thwaites is the largest glacier on Earth, spanning an area of approximately 192,000 square kilometers (74,130 square miles), comparable to Senegal or larger than Florida. It forms part of the vast West Antarctic Ice Sheet, which is roughly 14 times its size. The glacier has been in retreat for decades, but the newly identified process of warm water undercutting its base represents a critical shift in understanding its stability.

First mapped in 1947, Thwaites has long been a focus of scientific vigilance due to its potential to destabilize the larger ice sheet. The researchers noted that these projections hold even if global warming does not accelerate beyond current predictions, suggesting that climate models may need significant recalibration to account for this accelerated melt.

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Analysis

Why This Matters

  • The revised projection doubles the expected sea level contribution from Thwaites alone, directly threatening coastal communities and infrastructure worldwide.
  • The findings suggest current international climate models may underestimate the pace of ice sheet collapse, forcing a recalculation of adaptation timelines.
  • Confirmation of warm water intrusion beneath the glacier's core points to a feared tipping point scenario for the wider West Antarctic Ice Sheet.

Background

Thwaites Glacier is considered a keystone of the West Antarctic Ice Sheet. Scientists have long feared that warm ocean currents could destabilize the glacier from below, but the mechanism was largely theoretical. This research provides the strongest evidence yet that this process is actively accelerating its retreat. The glacier was first mapped in 1947 and has been the subject of intensive international study for decades due to the catastrophic sea level rise it could unlock.

Key Perspectives

Research Team (UC and NASA JPL): Their data reveals an active melting mechanism at the grounding zone that fundamentally changes the timeline for glacial retreat compared to prior assumptions. Coastal Planners and Governments: This accelerated projection forces a reassessment of adaptation needs, including seawall construction, land-use zoning and managed retreat timelines for vulnerable coastal cities. Climate Policy Observers: While the timeframe remains measured in decades, the study adds significant urgency to arguments for aggressive emissions reductions to limit long-term warming and ice loss.

What to Watch

  • Whether the IPCC or major climate modeling centers announce a formal review of sea level rise projections in light of these findings.
  • Plans for future scientific drilling or monitoring missions to the Thwaites grounding zone to verify the mechanism in greater detail.
  • Political reactions from vulnerable island nations and coastal states at upcoming international climate negotiations.

Sources

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Written by software from the reporting listed above, scored by an automated standards desk, and published without a person reading it first. If something here is wrong, tell the editor and it will be put right.

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