Thwaites glacier approaches irreversible collapse

An analysis of cracks in Antarctica's Thwaites Glacier over the past 20 years indicates it is nearing a total collapse. Known as the Doomsday Glacier, this rapidly changing ice mass poses uncertainties for global sea level rise predictions.

The Thwaites Glacier in Antarctica, often called the Doomsday Glacier, stands out as one of the planet's most rapidly evolving glaciers. A recent analysis examines the expansion of cracks within it over the last two decades, pointing to the possibility of an irreversible collapse in the near future.

This glacier's behavior remains a significant puzzle in forecasting how much sea levels might rise due to climate change. Scientists highlight its role in broader environmental shifts, including impacts on geology and earth science in polar regions.

The findings underscore the urgency of monitoring such ice formations, as their instability could accelerate global changes. While the exact timeline remains unclear, the observed crack growth suggests the glacier is getting closer to a tipping point.

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Antarctica’s Thwaites glacier is losing its eastern ice shelf as large fractures spread across the floating structure. The development threatens to speed up the glacier’s flow and add to global sea levels over coming decades.

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An international team led by the University of Portsmouth has cataloged more than 3,100 surging glaciers worldwide that can suddenly accelerate, triggering floods, avalanches and other hazards. These glaciers, concentrated in regions like the Arctic and Karakoram Mountains, affect nearly one-fifth of global glacier area despite comprising just 1 percent of all glaciers. Climate change is altering their behavior, increasing unpredictability.

A new study warns that a shutdown of the Atlantic Meridional Overturning Circulation (AMOC) would trigger the release of up to 640 billion tonnes of carbon dioxide from the deep Southern Ocean near Antarctica. This feedback effect could raise global temperatures by an additional 0.2°C. Researchers at the Potsdam Institute for Climate Impact Research highlight the risk as humanity's emissions continue to weaken the key ocean current.

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New climate modeling indicates that the Atlantic Meridional Overturning Circulation may weaken steadily due to Greenland meltwater but could recover if atmospheric carbon dioxide levels decline.

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