Navigation Links
New tool for measuring frozen gas in ocean floor sediments

A collaboration between the National Oceanography Centre (NOC) and the University of Southampton is to develop an instrument capable of simulating the high pressures and low temperatures needed to create hydrate in sediment samples.

Dr Angus Best of NOC and Professors Tim Leighton and Paul White from the University of Southampton's Institute of Sound and Vibration Research (ISVR) have been awarded a grant of 0,8 million by the Natural Environment Research Council (NERC) to investigate methods for assessing the volume of methane gas and gas hydrate locked in seafloor sediments.

Dr Best, who is leading the project, explained: "Greenhouse gases, such as methane and carbon dioxide, are trapped in sediments beneath the seafloor on continental shelves and slopes around the world. Currently, there are only very broad estimates of the amount of seafloor methane and hydrate."

The team plan a series of experiments on a range of sediment types, such as sand and mud. They intend to map out the acoustic and electrical properties of differing amounts of free methane gas and frozen solid methane hydrate.

The laboratory-based approach adopted by the team will involve the development of a major new Acoustic Pulse Tube instrument at NOC. Using acoustic techniques and theories developed by the ISVR team, they aim to provide improved geophysical remote sensing capabilities for better quantification of seafloor gas and hydrate deposits in the ocean floor.

"Not much is known about the state of gas morphology bubbles. Muddy sediments show crack-like bubbles, while sandy sediments show spherical bubbles. Only dedicated lab experiments can hope to unravel the complex interactions. By creating our own 'cores' of sediment material in a controlled environment where we know the concentrations of methane or carbon dioxide, we can create models to help us with in situ measurements on the seafloor."

There is significant interest in sub-seafloor carbon-dioxide storage sites. Methane hydrates are a potential energy resource that could be exploited in future. They may also contribute to geo-hazards such as seafloor landslides it is thought that earthquakes and the release of gas hydrates caused the largest-ever landslide, the Storegga Slide, around 8,000 years ago.

Professor Leighton said: "The three of us have collaborated in recent years in an experiment that used acoustics to take preliminary measurements of gas in the muddy sediments revealed at low tide. Those measurements, and the acoustic theory we developed to interpret the data, provided exactly the foundation we needed to undertake this critically important study that will be relevant to the seabed in somewhat deeper waters.

"As a greenhouse gas, methane is 20 times more potent per molecule than carbon dioxide. There is the potential for climate change to alter sea temperatures and cause more methane gas to be released from seabed hydrates into bubbles which reach the atmosphere. It is therefore vital that we have the tools to quantify and map the amount of methane that is down there."


Contact: Kim Marshall-Brown
National Oceanography Centre, Southampton (UK)

Related biology news :

1. New protocol recommendations for measuring soil organic carbon sequestration
2. Measuring the exertion of mini-basketball players
3. Measuring dispersal -- how well are soft-sediment invertebrate communities connected on the seafloor?
4. Bringing measuring accuracy to radical treatment
5. Measuring mercury levels: Nano-velcro detects water-borne toxic metals
6. Measuring progesterone receptor expression to improve hormone-receptor-positive cancer management
7. Measuring our carbon footprint
8. Oceanographers develop method for measuring the pace of life in deep sediments
9. Better outcome for frozen embryo replacement vs IVF
10. Color in fossil insects, diamonds from the ancient ocean floor and modeling the worlds largest rivers
11. Vibrant mix of marine life found at extreme ocean depths, Scripps analysis reveals
Post Your Comments:
Related Image:
New tool for measuring frozen gas in ocean floor sediments
(Date:10/27/2015)... YORK , Oct. 27, 2015 In ... major issues of concern for various industry verticals such ... is due to the growing demand for secure & ... in various ,sectors, such as hacking of bank accounts, ... for electronic equipment such as PC,s, laptops, and smartphones ...
(Date:10/26/2015)... LAS VEGAS , Oct. 26, 2015 /PRNewswire/ ... innovator in modern authentication and a founding member of ... of its latest version of the Nok Nok™ S3 ... use standards-based authentication that supports existing and emerging methods ... is ideal for organizations deploying customer-facing applications that require ...
(Date:10/22/2015)... 2015  Aware, Inc. (NASDAQ: AWRE ), a leading supplier ... third quarter ended September 30, 2015.  --> ... was $4.0 million, a decrease of 33% compared to $6.0 million ... quarter of 2015 was $2.2 million, or $0.10 per diluted share, ... the same period a year ago.  --> ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... ... November 25, 2015 , ... ... Organization of Black Aerospace Professionals (OPBAP) has been formalized with the signing of ... team leaders met with OPBAP leaders Capt. Karl Minter and Capt. Albert Glenn ...
(Date:11/24/2015)... ... November 24, 2015 , ... The United States Golf Association (USGA) ... USGA Green Section Award. Presented annually since 1961, the USGA Green Section Award recognizes ... with turfgrass. , Clarke, of Iselin, N.J., is an extension specialist of ...
(Date:11/24/2015)... Florida (PRWEB) , ... November 24, 2015 , ... ... biggest event of the year and one of the premier annual events for ... and ran from 8–11 November 2015, where ISPE hosted the largest number of ...
(Date:11/24/2015)... ... 24, 2015 , ... The Academy of Model Aeronautics (AMA), led by its ... as Multirotor Grand Prix, to represent the First–Person View (FPV) racing community. , FPV ... embraced this type of racing and several new model aviation pilots have joined the ...
Breaking Biology Technology: