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Distributed natural gas venting offshore along the Cascadia margin

Author

Listed:
  • M. Riedel

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • M. Scherwath

    (Ocean Networks Canada, University of Victoria’s Ocean-Climate Building at the Queenswood Campus)

  • M. Römer

    (MARUM—Center for Marine Environmental Sciences and Department of Geosciences at University of Bremen)

  • M. Veloso

    (GEOMAR Helmholtz Centre for Ocean Research Kiel
    Universidad Andrés Bello, Facultad de Ingeniería)

  • M. Heesemann

    (Ocean Networks Canada, University of Victoria’s Ocean-Climate Building at the Queenswood Campus)

  • G. D. Spence

    (School of Earth and Ocean Sciences, University of Victoria)

Abstract

Widespread gas venting along the Cascadia margin is investigated from acoustic water column data and reveals a nonuniform regional distribution of over 1100 mapped acoustic flares. The highest number of flares occurs on the shelf, and the highest flare density is seen around the nutrition-rich outflow of the Juan de Fuca Strait. We determine ∼430 flow-rates at ∼340 individual flare locations along the margin with instantaneous in situ values ranging from ∼6 mL min−1 to ∼18 L min−1. Applying a tidal-modulation model, a depth-dependent methane density, and extrapolating these results across the margin using two normalization techniques yields a combined average in situ flow-rate of ∼88 × 106 kg y−1. The average methane flux-rate for the Cascadia margin is thus estimated to ∼0.9 g y−1m−2. Combined uncertainties result in a range of these values between 4.5 and 1800% of the estimated mean values.

Suggested Citation

  • M. Riedel & M. Scherwath & M. Römer & M. Veloso & M. Heesemann & G. D. Spence, 2018. "Distributed natural gas venting offshore along the Cascadia margin," Nature Communications, Nature, vol. 9(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05736-x
    DOI: 10.1038/s41467-018-05736-x
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    Cited by:

    1. Dawang Zhang & James M. Campbell & Jon A. Eriksen & Eirik G. Flekkøy & Knut Jørgen Måløy & Christopher W. MacMinn & Bjørnar Sandnes, 2023. "Frictional fluid instabilities shaped by viscous forces," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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