Editorial Type:
Article
Article Type:
Research Article

Engineered and Natural Marine Seep, Bubble-Driven Buoyancy Flows

Ira Leifer Marine Science Institute, and Institute for Crustal Studies, University of California, Santa Barbara, Santa Barbara, California

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Henrik Jeuthe Norwegian College of Fishery Science, University of Tromsø, Tromsø, Norway

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Svein Helge Gjøsund SINTEF Fisheries and Aquaculture, Trondheim, Norway

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Vegar Johansen SINTEF Fisheries and Aquaculture, Trondheim, Norway

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Print Publication:
01 Dec 2009
DOI:
https://doi.org/10.1175/2009JPO4135.1
Page(s):
3071–3090
Restricted access

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Abstract

Bubble-plume upwelling flows were studied in the marine environment through dye releases into engineered plumes and a natural hydrocarbon seep plume. For engineered plumes, these experiments measured the water column–averaged upwelling flow Vup(zo) from release depth zo to the sea surface, for a wide range of flows Q, and zo. From Vup(zo), the local upwelling flow Vup(z), where z is depth, was calculated and found to vary with Q as Vup(z) ∼ Q0.23 for plumes strong enough to penetrate a shallow, thermally stratified layer, which was in good agreement with published relationships between Vup(z) and Q. These data were used to interpret data collected at a natural marine seep. For the seep, the upwelling flow decelerated toward the sea surface in contrast to the engineered plumes, which accelerated toward the sea surface. Data showed the seep bubble-plume upwelling flow lifted significantly colder and more saline water. The increased density difference between this upwelling fluid and the surrounding fluid most likely caused the deceleration. Midwater-column bubble measurements showed downcurrent detrainment of smaller bubbles from the bubble plume.

Corresponding author address: Ira Leifer, Marine Science Institute, University of California, Santa Barbara, Santa Barbara, CA 93106. Email: ira.leifer@bubbleology.com

Abstract

Bubble-plume upwelling flows were studied in the marine environment through dye releases into engineered plumes and a natural hydrocarbon seep plume. For engineered plumes, these experiments measured the water column–averaged upwelling flow Vup(zo) from release depth zo to the sea surface, for a wide range of flows Q, and zo. From Vup(zo), the local upwelling flow Vup(z), where z is depth, was calculated and found to vary with Q as Vup(z) ∼ Q0.23 for plumes strong enough to penetrate a shallow, thermally stratified layer, which was in good agreement with published relationships between Vup(z) and Q. These data were used to interpret data collected at a natural marine seep. For the seep, the upwelling flow decelerated toward the sea surface in contrast to the engineered plumes, which accelerated toward the sea surface. Data showed the seep bubble-plume upwelling flow lifted significantly colder and more saline water. The increased density difference between this upwelling fluid and the surrounding fluid most likely caused the deceleration. Midwater-column bubble measurements showed downcurrent detrainment of smaller bubbles from the bubble plume.

Corresponding author address: Ira Leifer, Marine Science Institute, University of California, Santa Barbara, Santa Barbara, CA 93106. Email: ira.leifer@bubbleology.com

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