In a new scientific article published in the journal Nature Communications a group of scientists led by University of Copenhagen authors shows that thawing permafrost releases a high amount and diversity of volatile organic compounds (VOCs).

These compounds are not greenhouse gases like carbon dioxide and methane. VOCs are known to be released from plants for example to cope with stress and to communicate with other organisms, but less is known about their release from soil. They react fast in the atmosphere and these reactions have several consequences.

For example the production of ground level ozone, which is harmful for human health and toxic for forests. Perhaps the most important consequence of these reactions in the Arctic is the production of tiny particles that scatter solar radiation back to space and form clouds. This can have a cooling impact on climate.

Professor Riikka Rinnan from Department of Biology and Center for Permafrost, University of Copenhagen explains, 'Surprisingly, our new experiments show that VOCs can be released from soil permafrost layers, which often represent organic material stored for decades or longer.

Even more surprisingly, VOCs from thawing permafrost may not be released to the atmosphere, as our results show that the annual thaw layers above the permafrost seem to filter the VOCs being released from the permafrost.'

Soil microbes in a crucial role
Using advanced tracing techniques the research team shows, that the VOCs are consumed by microorganisms living in the soil layers. It appears, therefore, that the actual release of VOCs from thawing permafrost is determined by what happens to them on the way from the deeper soil layers to the atmosphere.

If the permafrost is exposed to the surface e.g. due to erosion, or if the microbial uptake is hampered for example due to waterlogging, this could be a new, unaccounted Arctic VOC source with potential implications on the regional climate.

Related Links
Faculty of Science - University of Copenhagen
Beyond the Ice Age

Tweet

Thanks for being here; We need your help. The Space Media 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.
SpaceMediaNetwork Contributor $5 Billed Once credit card or paypal		SpaceMediaNetwork Monthly Supporter $5 Billed Monthly paypal only

Ecosystems are getting greener in the Arctic
Berkeley CA (SPX) Aug 29, 2018
In recent decades, scientists have noted a surge in Arctic plant growth as a symptom of climate change. But without observations showing exactly when and where vegetation has bloomed as the world's coldest areas warm, it's difficult to predict how vegetation will respond to future warming. Now, researchers at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and UC Berkeley have developed a new approach that may paint a more accurate picture of Arctic vegetation ... read more