Distributed natural gas venting offshore along the Cascadia margin

Riedel, Michael, Scherwath, Martin, Römer, M., Veloso, Mario, Heesemann, M. and Spence, G. D. (2018) Distributed natural gas venting offshore along the Cascadia margin Nature Communications, 9 (3264). DOI 10.1038/s41467-018-05736-x.

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Supplementary data:

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 similar to 430 flow-rates at similar to 340 individual flare locations along the margin with instantaneous in situ values ranging from similar to 6 mL min(-1) to similar 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 similar to 88 x 10(6) kg y(-1). The average methane flux-rate for the Cascadia margin is thus estimated to similar to 0.9 g y(-1) m(-2). Combined uncertainties result in a range of these values between 4.5 and 1800% of the estimated mean values.

Document Type: Article
Keywords: METHANE HYDRATE DEPOSITS; NORTHERN CASCADIA; TEMPORAL VARIABILITY; MARINE-SEDIMENTS; VANCOUVER-ISLAND; SUBDUCTION ZONE; FLUID EXPULSION; BLACK-SEA; BUBBLES; OCEAN
Research affiliation: MARUM
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1038/s41467-018-05736-x
ISSN: 2041-1723
Date Deposited: 31 Aug 2018 08:06
Last Modified: 31 Aug 2018 08:13
URI: http://eprints.uni-kiel.de/id/eprint/44087

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