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A Spanish scientific expedition has identified substantial methane leaks from the Antarctic seabed, raising concerns about their implications for global warming. Researchers aboard the vessel Sarmiento de Gamboa reported observing gas columns measuring up to 700 meters long and 70 meters wide, as stated by geologists Ricardo León and Roger Urgeles in an interview with EL PAÍS. Methane, which has a warming potential 30 times greater than carbon dioxide, could significantly impact the planet's climate.
The methane deposits, believed to have been sequestered for approximately 20,000 years, are being destabilized due to a phenomenon known as post-glacial rebound, which causes a rise in the Antarctic land mass as the ice sheet thins. Urgeles estimated that the region contains around 24 gigatons of carbon in methane hydrates, equivalent to global emissions over two years. Increased instability in marine sediments may also lead to dangerous landslides, posing additional risks, including potential tsunamis, according to León.
The discoveries mark the first methane emissions recorded in Antarctica, following similar events previously observed in the Arctic.