Nav: Home

Scientists discovered an entirely new reason for methane venting from the Arctic Shelf

May 21, 2019

Russian scientists have discovered a previously unknown mechanism of influence of salts migration on the degradation of gigantic intra permafrost gas (methane) hydrate reserves in the Arctic Shelf. The results of their study were published in Geosciences journal.

Methane is a powerful greenhouse gas and one of the major global climate change drivers. Following many years of observation in the Arctic region, Russian scientists have eventually found that the East Siberian Arctic Shelf is one of the largest sources of methane emissions, which do not only expedite global warming and upset the Earth's carbon balance, but also cause accidents hindering economic activity in the Arctic ? one of the most promising hydrocarbon production regions. So it comes as no surprise that RAS President Alexander Sergeyev has placed high priority on exploring the reasons for methane emissions from the East Siberian Arctic Shelf.

A large part of methane escapes into the atmosphere due to the decomposition of gas hydrates ? crystalline compounds formed from gas and water at low temperature and high pressure. Clusters of gas hydrate crystals resemble an ice mass that can just barely be considered a gas in solid state, with a unit volume of gas hydrate containing up to 160-180 volumes of pure gas. Gas hydrates that formed thousands of years ago under favorable natural conditions may start dissociating into gas and water (or in other words, "thawing") if the natural environment is no longer conducive to their sustainable existence.

Scientists from Skoltech, Tomsk Polytechnic University, and the Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences (RAS) found that one of the reasons for extensive methane release from the bottom sediments of the East Siberian Arctic Shelf is the destabilization of underwater permafrost gas hydrates that interact with the salt solutions (sea water) migrating into the thawing submarine permafrost.

The authors of the paper were the first to prove experimentally that gas hydrates become unstable and start to decompose when interacting with salts even under permafrost conditions.

"We conducted experiments focusing on the interaction between frozen rocks containing relict methane hydrates and salt solutions at different negative temperatures. We found that salt migration to the frozen hydrate-containing rocks intensifies the pore gas hydrates dissociation and accelerates their thawing," says the Leading Research Scientist at the Skoltech Center for Hydrocarbon Recovery Evgeny Chuvilin. "Since these processes intensify the release of methane from frozen hydrate-containing rocks, which is important for understanding the mechanism of massive methane discharge from bottom sediments, we used the results of the experiments to build a model of the interaction of the hydrate- saturated permafrost with sea water on the Arctic Shelf."

These findings explain the reason for the upward movement of the methane front that the authors discovered on the East Siberian Arctic Shelf based on a suite of geophysical and biogeochemical studies (Shakhova et al., Nature Communications, 2017;

Skolkovo Institute of Science and Technology (Skoltech)

Related Methane Articles:

Microbial fuel cell converts methane to electricity
Transporting methane from gas wellheads to market provides multiple opportunities for this greenhouse gas to leak into the atmosphere.
Methane seeps in the Canadian high Arctic
Cretaceous climate warming led to a significant methane release from the seafloor, indicating potential for similar destabilization of gas hydrates under modern global warming.
Methane emissions from trees
A new study from the University of Delaware is one of the first in the world to show that tree trunks in upland forests actually emit methane rather than store it, representing a new, previously unaccounted source of this powerful greenhouse gas.
Oil production releases more methane than previously thought
Emissions of methane and ethane from oil production have been substantially higher than previously estimated, particularly before 2005.
Bursts of methane may have warmed early Mars
The presence of water on ancient Mars is a paradox.
New method for quantifying methane emissions from manure management
The EU Commision requires Denmark to reduce drastically emissions of greenhouse gases from agriculture.
New 3-D printed polymer can convert methane to methanol
Lawrence Livermore National Laboratory scientists have combined biology and 3-D printing to create the first reactor that can continuously produce methanol from methane at room temperature and pressure.
Arctic Ocean methane does not reach the atmosphere
250 methane flares release the climate gas methane from the seabed and into the Arctic Ocean.
Long-sought methane production mechanism identified
Researchers have identified the mechanism by which bacteria create methane, a potent greenhouse gas.
Retreat of the ice followed by millennia of methane release
Methane was seeping from the seafloor for thousands of years following the retreat of the Barents Sea ice sheet, shows a groundbreaking new study in Nature Communications.

Related Methane Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Do animals grieve? Do they have language or consciousness? For a long time, scientists resisted the urge to look for human qualities in animals. This hour, TED speakers explore how that is changing. Guests include biological anthropologist Barbara King, dolphin researcher Denise Herzing, primatologist Frans de Waal, and ecologist Carl Safina.
Now Playing: Science for the People

#532 A Class Conversation
This week we take a look at the sociology of class. What factors create and impact class? How do we try and study it? How does class play out differently in different countries like the US and the UK? How does it impact the political system? We talk with Daniel Laurison, Assistant Professor of Sociology at Swarthmore College and coauthor of the book "The Class Ceiling: Why it Pays to be Privileged", about class and its impacts on people and our systems.