Thawing permafrost produces more methane than expected

Methane (CH4) is a potent greenhouse gas, which is roughly 30 times more harmful to the climate than carbon dioxide (CO2). Both gases are produced in thawing permafrost as dead animal and plant remains are decomposed. However, methane is only formed if no oxygen is available.

Until now, it was assumed that larger amounts of greenhouse gases are formed when the ground was dry and well aerated - when oxygen was available. Christian Knoblauch and his colleagues have now demonstrated that water-saturated permafrost soils without oxygen can be twice as harmful to the climate as dry soils - which means the role of methane has been greatly underestimated.

Knoblauch has, for the first time, measured and quantified in the laboratory the long-term production of methane in thawing permafrost.

The team had to wait for three years before the approximately 40,000 year-old samples from the Siberian Arctic finally produced methane.

The team observed the permafrost for a total of seven years: an unprecedented longterm study.

What they found: without oxygen, equal amounts of methane and CO2 are produced. But since methane is a far more potent greenhouse gas, it is more significant. Because methane production couldn't be measured, it was assumed that in the absence of oxygen only very small amounts of it can be formed.

"It takes an extremely long time until stable methane-producing microorganisms develop in thawing permafrost," explains Knoblauch. "That's why it was so difficult to demonstrate methane production until now."

"By combining process-based and molecular-microbiological methods, our study shows for the first time that the methane-forming microorganisms in the thawing permafrost have significant influence on the greenhouse gas budget," adds co-author Susanne Liebner from the Helmholtz Center Potsdam - GFZ German Research Center for Geosciences.

The team has used the new data to improve a computer model that estimates how much greenhouse gas is produced in permafrost in the long term - and they've compiled a first forecasts. According to the scientists: The permafrost soils of Northern Europe, Northern Asia and North America could produce up to 1 gigaton of methane and 37 gigatons of carbon dioxide by 2100.

But there are uncertainties. To what depth will the soil actually thaw by then? Will it be wet or dry? One thing, however, is certain: the new data will enable more accurate predictions about the impacts of thawing permafrost on our climate.

Knoblauch C, Beer C, Liebner S, Grigoriev M N, Pfeiffer E-M (2018): Methane production as key to the greenhouse gas budget of thawing permafrost; Nature Climate Change, DOI: 10.1038/s41558-018-0095-z

Related Links
GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre
Beyond the Ice Age

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

Study helps explain Greenland glaciers' varied vulnerability to melting
Irvine CA (SPX) Mar 19, 2018
Using data from NASA missions observing Earth, researchers at the University of California, Irvine have created new maps of the bed topography beneath a score of glaciers in southeast Greenland, thereby gaining a much better understanding of why some are undergoing rapid retreat and others are relatively stable. "The undersides of glaciers in deeper valleys are exposed to warm, salty Atlantic water, while the others are perched on sills, protected from direct exposure to warmer ocean water," said ... read more