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dc.contributor.authorWang, Binbin  Concept link
dc.contributor.authorSocolofsky, Scott  Concept link
dc.contributor.authorBreier, John A.  Concept link
dc.contributor.authorSeewald, Jeffrey S.  Concept link
dc.date.accessioned2016-10-31T17:32:36Z
dc.date.available2016-10-31T17:32:36Z
dc.date.issued2016-04-02
dc.identifier.citationJournal of Geophysical Research: Oceans 121 (2016): 2203–2230en_US
dc.identifier.urihttps://hdl.handle.net/1912/8482
dc.descriptionAuthor Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 2203–2230, doi:10.1002/2015JC011452.en_US
dc.description.abstractThis paper reports the results of quantitative imaging using a stereoscopic, high-speed camera system at two natural gas seep sites in the northern Gulf of Mexico during the Gulf Integrated Spill Research G07 cruise in July 2014. The cruise was conducted on the E/V Nautilus using the ROV Hercules for in situ observation of the seeps as surrogates for the behavior of hydrocarbon bubbles in subsea blowouts. The seeps originated between 890 and 1190 m depth in Mississippi Canyon block 118 and Green Canyon block 600. The imaging system provided qualitative assessment of bubble behavior (e.g., breakup and coalescence) and verified the formation of clathrate hydrate skins on all bubbles above 1.3 m altitude. Quantitative image analysis yielded the bubble size distributions, rise velocity, total gas flux, and void fraction, with most measurements conducted from the seafloor to an altitude of 200 m. Bubble size distributions fit well to lognormal distributions, with median bubble sizes between 3 and 4.5 mm. Measurements of rise velocity fluctuated between two ranges: fast-rising bubbles following helical-type trajectories and bubbles rising about 40% slower following a zig-zag pattern. Rise speed was uncorrelated with hydrate formation, and bubbles following both speeds were observed at both sites. Ship-mounted multibeam sonar provided the flare rise heights, which corresponded closely with the boundary of the hydrate stability zone for the measured gas compositions. The evolution of bubble size with height agreed well with mass transfer rates predicted by equations for dirty bubbles.en_US
dc.description.sponsorshipGulf of Mexico Research Initiativeen_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2015JC011452
dc.subjectNatural seepsen_US
dc.subjectNatural gas bubbleen_US
dc.subjectClathrate hydrateen_US
dc.subjectPlumeen_US
dc.subjectQuantitative imagingen_US
dc.titleObservations of bubbles in natural seep flares at MC 118 and GC 600 using in situ quantitative imagingen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/2015JC011452


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