Ocean absorption of carbon dioxide compensates for emissions from seafloor methane seeps
The ocean waters near the surface of the Arctic Ocean absorbed 2,000 times more carbon dioxide from the atmosphere than the amount of methane that escaped into the atmosphere from the same waters, according to a study by the USGS Gas Hydrates Project and collaborators in Germany and Norway. The study was conducted near Norway's Svalbard Islands, above several seafloor methane seeps.
Methane is a more potent greenhouse gas than carbon dioxide, but the removal of carbon dioxide from the atmosphere where the study was conducted more than offset the potential warming effect of the methane emissions that were observed.
"If what we observed near Svalbard occurs more broadly at similar locations around the world, it could mean that methane seeps have a net cooling effect on climate, not a warming effect as we previously thought," said USGS biogeochemist John Pohlman, who is the paper's lead author. "We are looking forward to testing the hypothesis that shallow-water methane seeps are net greenhouse gas sinks in other locations."
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