The bubble mechanism for methane transport from the shallow sea bed to the surface: A review and sensitivity study

The bubble mechanism for methane transport from the shallow sea bed to the surface: A review and... Bubbles transport methane (CH 4 ) released from the sea bed to the surface while exchanging gas with the surrounding aqueous environment. The fraction of CH 4 released at the surface depends upon the release depth, bubble size, dissolved gas concentrations, temperature, surface-active substances, and bulk fluid motions—particularly the upwelling flow. A bubble model was developed to examine the sensitivity of bubble-mediated CH 4 transport to these parameters. A strong sensitivity to several environmental parameters was found that must be accurately measured in order to correctly predict bubble-mediated CH 4 transport. Strong sensitivities (one or more orders of magnitude, depending upon initial bubble size and depth) were found for both aqueous CH 4 concentration and upwelling flows. The equations used to model bubble-mediated gas transfer incorporate parameterizations of bubble motion and gas transfer. A review of the literature on the experimental measurements and theory used to derive these parameterizations is presented, and the approaches used in geophysics and chemical engineering bubble models, are described. This research seeks to provide all the necessary parameterizations and theoretical background to allow modeling of CH 4 bubble streams for diverse marine conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Continental Shelf Research Elsevier

The bubble mechanism for methane transport from the shallow sea bed to the surface: A review and sensitivity study

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Publisher
Elsevier
Copyright
Copyright © 2002 Elsevier Science Ltd
ISSN
0278-4343
eISSN
1873-6955
DOI
10.1016/S0278-4343(02)00065-1
Publisher site
See Article on Publisher Site

Abstract

Bubbles transport methane (CH 4 ) released from the sea bed to the surface while exchanging gas with the surrounding aqueous environment. The fraction of CH 4 released at the surface depends upon the release depth, bubble size, dissolved gas concentrations, temperature, surface-active substances, and bulk fluid motions—particularly the upwelling flow. A bubble model was developed to examine the sensitivity of bubble-mediated CH 4 transport to these parameters. A strong sensitivity to several environmental parameters was found that must be accurately measured in order to correctly predict bubble-mediated CH 4 transport. Strong sensitivities (one or more orders of magnitude, depending upon initial bubble size and depth) were found for both aqueous CH 4 concentration and upwelling flows. The equations used to model bubble-mediated gas transfer incorporate parameterizations of bubble motion and gas transfer. A review of the literature on the experimental measurements and theory used to derive these parameterizations is presented, and the approaches used in geophysics and chemical engineering bubble models, are described. This research seeks to provide all the necessary parameterizations and theoretical background to allow modeling of CH 4 bubble streams for diverse marine conditions.

Journal

Continental Shelf ResearchElsevier

Published: Nov 1, 2002

References

  • The effect of surfactants on the rise of a spherical bubble at high Reynolds and Peclet numbers
    Fdihla, R.B.; Duineveld, P.C.
  • Contributions to atmospheric methane by natural seepages on the UK continental shelf
    Judd, A.; Davies, G.; Wilson, J.; Holmes, R.; Baron, G.; Bryden, I.
  • A study on the temperature variation of rise velocity for large clean bubbles
    Leifer, I.S.; Patro, R.K.; Bowyer, P.
  • Modifications of the local environment by natural hydrocarbon seeps
    Leifer, I.; Clarke, J.F.; Chen, R.F.
  • Mass transfer and drag coefficients of bubbles rising in dilute aqueous solutions
    Raymond, D.R.; Zieminski, S.A.

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