scholarly journals Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard

2019 ◽  
Vol 46 (15) ◽  
pp. 9072-9081 ◽  
Author(s):  
Mario E. Veloso‐Alarcón ◽  
Pär Jansson ◽  
Marc De Batist ◽  
Timothy A. Minshull ◽  
Graham K. Westbrook ◽  
...  
Keyword(s):  
Methane Bubble

scholarly journals Observations of Shallow Methane Bubble Emissions From Cascadia Margin

2021 ◽  
Vol 9 ◽  
Author(s):  
Anna P. M. Michel ◽  
Victoria L. Preston ◽  
Kristen E. Fauria ◽  
David P. Nicholson
Keyword(s):  
Water Column ◽  
Water Depth ◽  
Dissolved Methane ◽  
Multibeam Sonar ◽  
Surface Ocean ◽  
Transient Nature ◽  
Technological Approach ◽  
Open Questions ◽  
Cascadia Margin ◽  
Methane Bubble

Open questions exist about whether methane emitted from active seafloor seeps reaches the surface ocean to be subsequently ventilated to the atmosphere. Water depth variability, coupled with the transient nature of methane bubble plumes, adds complexity to examining these questions. Little data exist which trace methane transport from release at a seep into the water column. Here, we demonstrate a coupled technological approach for examining methane transport, combining multibeam sonar, a field-portable laser-based spectrometer, and the ChemYak, a robotic surface kayak, at two shallow (<75 m depth) seep sites on the Cascadia Margin. We demonstrate the presence of elevated methane (above the methane equilibration concentration with the atmosphere) throughout the water column. We observe areas of elevated dissolved methane at the surface, suggesting that at these shallow seep sites, methane is reaching the air-sea interface and is being emitted to the atmosphere.

scholarly journals Variability of Natural Methane Bubble Release at Southern Hydrate Ridge

2021 ◽  
Author(s):  
Yann Marcon ◽  
Deborah Kelley ◽  
Blair Thornton ◽  
Dana Manalang ◽  
Gerhard Bohrmann
Keyword(s):  
Hydrate Ridge ◽  
Methane Bubble

scholarly journals Rising Characteristics of a Methane Bubble under Different Conditions: A CFD Study

2020 ◽  
Vol 1600 ◽  
pp. 012067
Author(s):  
Christian Mulbah ◽  
Ning Mao ◽  
Wei Zhang ◽  
Piyaphong Yongphet
Keyword(s):  
Methane Bubble

scholarly journals Passive acoustic records of seafloor methane bubble streams on the Oregon continental margin

2018 ◽  
Vol 150 ◽  
pp. 210-217 ◽  
Author(s):  
R.P. Dziak ◽  
H. Matsumoto ◽  
R.W. Embley ◽  
S.G. Merle ◽  
T.-K. Lau ◽  
...  
Keyword(s):  
Continental Margin ◽  
Methane Bubble ◽  
Passive Acoustic

scholarly journals Distribution and height of methane bubble plumes on the Cascadia Margin characterized by acoustic imaging

2003 ◽  
Vol 30 (12) ◽  
Author(s):  
Katja U. Heeschen ◽  
Anne M. Tréhu ◽  
Robert W. Collier ◽  
Erwin Suess ◽  
Gregor Rehder
Keyword(s):  
Acoustic Imaging ◽  
Bubble Plumes ◽  
Cascadia Margin ◽  
Methane Bubble

Kinetics of methane bubble growth in a 1020 steel

1984 ◽  
Vol 15 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Binayak Panda ◽  
Paul Shewmon
Keyword(s):  
Bubble Growth ◽  
Methane Bubble ◽  
Kinetics Of

scholarly journals Dissolution Process Observation of Methane Bubbles in the Deep Ocean Simulator Facility

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3938
Author(s):  
Tsutomu Uchida ◽  
Ike Nagamine ◽  
Itsuka Yabe ◽  
Tatsunori Fukumaki ◽  
Ai Oyama ◽  
...  
Keyword(s):  
Dissolution Rate ◽  
Thermal Activation ◽  
Pure Water ◽  
Deep Ocean ◽  
Ccd Camera ◽  
Activation Process ◽  
Thermal Activation Process ◽  
Methane Bubble ◽  
Expected Values ◽  
Process Observation

To investigate the temperature dependency of the methane bubble dissolution rate, buoyant single methane bubbles were held stationary in a countercurrent water flow at a pressure of 6.9 MPa and temperatures ranging from 288 K to 303 K. The 1 to 3 mm diameter bubbles were analyzed by observation through the pressure chamber viewport using a bi-telecentric CCD camera. The dissolution rate in artificial seawater was approximately two times smaller than that in pure water. Furthermore, it was observed that the methane bubble dissolution rate increased with temperature, suggesting that bubble dissolution is a thermal activation process (the activation energy is estimated to be 9.0 kJ/mol). The results were different from the expected values calculated using the governing equation for methane dissolution in water. The dissolution modeling of methane bubbles in the mid-to-shallow depth of seawater was revised based on the current results.

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