Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Understanding methane's seabed escape

21.09.2011
A shipboard expedition off Norway, to determine how methane escapes from beneath the Arctic seabed, has discovered widespread pockets of the gas and numerous channels that allow it to reach the seafloor.

Methane is a powerful "greenhouse" gas and the research, carried out over the past week aboard the Royal Research Ship James Clark Ross, will improve understanding of its origins in this area, its routes to the sea floor and how the amount of gas escaping might increase as the ocean warms. This could have important implications for global climate change and ocean acidification.

At the high pressures and low temperatures which are found at the bottom of the deep ocean, methane gas and water combine to form a solid, crystalline substance - methane hydrate. It is very widespread in the parts of the deep ocean nearest to the continents. If the ocean warms, the hydrate can become unstable and methane gas is unlocked and can make its way into the ocean, forming plumes of bubbles.

A research cruise to the same area in 2008, also aboard RRS James Clark Ross, discovered numerous such plumes, as well as evidence for the presence of gas and the movement of fluids beneath the seabed. What was unclear though was how the gas was escaping into the ocean.

The current expedition is led by the University of Southampton's Professor Tim Minshull, who is based at the National Oceanography Centre, Southampton. The shipboard team - which includes scientists from the National Oceanography Centre Southampton, its French counterpart, the French Research Institute for Exploration of the Sea (Ifremer) and the University of Tromsoe in Norway - used a range of new technologies to probe the seabed beneath areas where methane gas was found to be escaping, due partly to recent warming of the ocean.

Ifremer's SYSIF sonar system produced detailed images reaching 100 to 200 metres beneath the seafloor, which show how gas is in some places trapped and in some places is travelling upwards through narrow fractures and pipes to the seafloor. A seismic system towed across the sea surface provided images of deeper gas pockets beyond the reach of the towed sonar.

Professor Minshull, who is Head of Ocean and Earth Science at the University of Southampton, said: "Methane gas escaping from the Arctic seabed might make an important contribution to global climate change, but we need to understand the origin of this gas and its escape route to work out how the amount of gas escaping might change as the ocean warms. We now have very clear images of the gas escape routes and also of many places where gas is trapped and not yet escaping."

Some of the team will return next summer to work with an electromagnetic sounding system that will allow better estimates to be made of the amount of methane stored beneath the seabed in this sensitive area.

The work forms part of an international effort involving scientists in Britain, France, Germany and Norway that has brought research vessels to the same small area every year since 2008, including two vessels in 2011. The expedition was one of two in this area this year funded by the Natural Environment Research Council.

Mike Douglas | EurekAlert!
Further information:
http://www.noc.ac.uk

More articles from Earth Sciences:

nachricht New plate adds plot twist to ancient tectonic tale
15.08.2017 | Rice University

nachricht Global warming will leave different fingerprints on global subtropical anticyclones
14.08.2017 | Institute of Atmospheric Physics, Chinese Academy of Sciences

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

Im Focus: Scientists improve forecast of increasing hazard on Ecuadorian volcano

Researchers from the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, the Italian Space Agency (ASI), and the Instituto Geofisico--Escuela Politecnica Nacional (IGEPN) of Ecuador, showed an increasing volcanic danger on Cotopaxi in Ecuador using a powerful technique known as Interferometric Synthetic Aperture Radar (InSAR).

The Andes region in which Cotopaxi volcano is located is known to contain some of the world's most serious volcanic hazard. A mid- to large-size eruption has...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

New thruster design increases efficiency for future spaceflight

16.08.2017 | Physics and Astronomy

Transporting spin: A graphene and boron nitride heterostructure creates large spin signals

16.08.2017 | Materials Sciences

A new method for the 3-D printing of living tissues

16.08.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>