Submission + - Warmer Pacific Ocean could release millions of tons of methane (washington.edu)
vinces99 writes: Off the U.S. West Coast, methane gas is trapped in frozen layers below the seafloor. New research from the University of Washington shows that water at intermediate depths is warming enough to cause these carbon deposits to melt, releasing methane into the sediments and surrounding water. Researchers found that water off the coast of Washington is gradually warming at a depth of 500 meters (about a third of a mile down), the same depth where methane transforms from a solid to a gas. The research suggests that ocean warming could be triggering the release of a powerful greenhouse gas.
Scientists believe global warming will release methane from gas hydrates worldwide, but most of the focus has been on the Arctic. The new paper estimates that, from 1970 to 2013, some 4 million metric tons of methane has been released from hydrate decomposition off Washington's coast. That’s an amount each year equal to the methane from natural gas released in the 2010 Deepwater Horizon blowout off the coast of Louisiana, and 500 times the rate at which methane is naturally released from the seafloor.
Scientists believe global warming will release methane from gas hydrates worldwide, but most of the focus has been on the Arctic. The new paper estimates that, from 1970 to 2013, some 4 million metric tons of methane has been released from hydrate decomposition off Washington's coast. That’s an amount each year equal to the methane from natural gas released in the 2010 Deepwater Horizon blowout off the coast of Louisiana, and 500 times the rate at which methane is naturally released from the seafloor.
