Gas from thawing permafrost could add further to global warming, study says

by Ellen Wulfhorst | @EJWulfhorst | Thomson Reuters Foundation
Friday, 26 February 2016 03:33 GMT

In a 2007 file photo, scientist Sergei Zimov takes a sample of ground taken from a layer of melting permafrost on the Duvanny Yar cliff, some 120 km (75 miles) from the town of Chersky in northeast Siberia. REUTERS/Dmitry Solovyov

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Permafrost thaw is adding to emissions of carbon dioxide and methane into the atmosphere

NEW YORK, Feb 25 (Thomson Reuters Foundation) - Arctic permafrost that is thawing due to global warming is releasing greenhouse gases, further compounding the problem of climate change, according to a study released on Thursday.

As the permafrost thaws, changes in the way its soil microbes function and the soil carbon decomposes add to the emissions of carbon dioxide and methane into the atmosphere, according to the study by U.S. and Chinese scientists.

Carbon dioxide and methane are the main greenhouse gases that trap heat and contribute to climate change.

Permafrost is the perennially frozen ground that covers a quarter of the land in the Northern Hemisphere, primarily in the Arctic, said the study published in the monthly Nature Climate Change journal.

Working in Alaska, researchers warmed plots of tundra to thaw the permafrost and after 18 months found numerous changes in the soil microbes, it said.

"This study highlights the critical role that microbes play in mediating carbon losses from Arctic soils," said Susan Natali, a scientist at Woods Hole Research Center in Massachusetts and co-author of the Nature Climate Change paper, in a statement.

"The rapid response of the microbial community to warming suggests that the large store of soil carbon currently contained in permafrost will be highly susceptible to decomposition once it is thawed."

Previous studies have suggested that permafrost could decline by as much as 70 percent by the end of the century, according to the statement.

(Reporting by Ellen Wulfhorst, editing by Alisa Tang. Please credit the Thomson Reuters Foundation, the charitable arm of Thomson Reuters, that covers humanitarian news, women's rights, trafficking, corruption and climate change. Visit http://news.trust.org)

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