A rapid rise in methane escaping through cracks in the seabed off the coast of Antarctica has alarmed scientists, raising fresh concerns that current climate models may be underestimating future warming. The methane leak from the Antarctica sea is occurring at a pace researchers did not anticipate, with more than 40 new seep sites recently discovered in the shallow waters of the Ross Sea.
The discovery comes from an international team of scientists who conducted surveys in the Southern Ocean using acoustic sensors, remotely operated vehicles, and divers. They explored sites between 16 and 790 feet deep and reported their findings in a recent study published in Nature Communications.
Researchers noted that many of the newly detected seeps appeared in locations previously studied, suggesting they formed only recently. The findings point to a possible shift in how methane is being released in the region.
Sudden increase raises alarms among researchers
Methane is a potent greenhouse gas, trapping about 80 times more heat than carbon dioxide over a 20-year period. While seeps are common in oceans around the world, Antarctica was believed to have only one known active seep until now.
Sarah Seabrook, a marine scientist at Earth Sciences New Zealand and a co-author of the study, said what was once considered rare is now appearing to be more widespread.
She said the team was initially excited with each new discovery, but that feeling was quickly replaced by concern over the implications for climate change.
The cause of the sudden increase in methane seeps remains uncertain. However, researchers are examining potential links to climate change.
Seabrook noted that similar methane releases in the Arctic have been connected to warming temperatures, changing sea levels, and geological shifts caused by the slow rebound of land since the last Ice Age.
She warned that such changes can create a feedback loop, where warming triggers methane leaks, which in turn accelerate climate change.
Next expedition to focus on long-term impact
Andrew Thurber, a marine biology professor at the University of California, Santa Barbara, and co-author of the study, emphasized the urgency of understanding methane’s behavior.
He said methane is rising in the atmosphere, but scientists still do not fully understand the source. Thurber cautioned that if warming continues, Antarctica could shift from being a unique research environment to a high-risk area for climate instability.
The research team is returning to Antarctica next week for a two-month expedition to study the methane seeps more closely and assess their potential long-term impact.
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