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NEW ACOUSTICAL TECHNIQUE TO QUANTIFY METHANE EBULLITION IN SEDIMENT WATER COLUMN: A CASE STUDY IN THE LAPTEV SEA, THE ARCTIC OCEAN
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Number of Authors: 142018 (Russian)In: Bulletin of the Tomsk Polytechnic University - Geo Assets Engineering, ISSN 2500-1019, Vol. 329, no 11, p. 153-167Article in journal (Refereed) Published
Abstract [ru]

The relevance of the research is caused by the need to develop a scientifically based approach to quantitative estimation of bubble transfer of methane and other gases based on acoustic techniques, which allow reliable estimate of methane flow from the bubble unloading areas by sound locators and submarine sonars. The main aim of the research is to investigate the possible application of an acoustical technique based on acoustic scattering in bubble plumes vs the acoustical technique based on calibration which was applied to quantify in situ sonar observations; to show that both techniques can be used for a quantification of methane ebullition in the bottom-water column system. Objects: gas flares or seeps - the emanations of gas in the form of rising bubbles from the seabottom, which form stable regions of their increased concentration in the water column. Methods: modification of acoustical techniques based on acoustic scattering in bubble plumes and on ist calibration which was applied by authors to quantify in situ single sonar observations. Results. We demonstrate a first attempt to use acoustical techniques based on (1) acoustic scattering in bubble plumes vs acoustical technique based on (2) calibration which was applied to quantify in situ sonar observations. It has been shown that both techniques can be used for a quatitative express-evaluation of methane ebullition in the bottom-water system in any aquatic ecosystem including seas, lakes, and rivers, while the first acoustical technique gives the bubble efflux values -20 % lower then the second acoustical technique.

Place, publisher, year, edition, pages
2018. Vol. 329, no 11, p. 153-167
Keywords [en]
Arctic, acoustic estimation, methane, seep, Laptev sea, bubbles transport, methane flux
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:su:diva-163628ISI: 000451719200015OAI: oai:DiVA.org:su-163628DiVA, id: diva2:1282082
Available from: 2019-01-24 Created: 2019-01-24 Last updated: 2019-01-24Bibliographically approved

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Gustafsson, Örjan
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CiteExportLink to record
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Citation style
  • apa
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