Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard

Mario E. Veloso-Alarcón, Pär Jansson, Marc De Batist, Timothy A. Minshull, Graham K. Westbrook, Heiko Pälike, Stefan Bünz, Ian Wright, Jens Greinert

Resultado de la investigación: Article

1 Cita (Scopus)

Resumen

Large reservoirs of methane present in Arctic marine sediments are susceptible to rapid warming, promoting increasing methane emissions. Gas bubbles in the water column can be detected, and flow rates can be quantified using hydroacoustic survey methods, making it possible to monitor spatiotemporal variability. We present methane (CH4) bubble flow rates derived from hydroacoustic data sets acquired during 11 research expeditions to the western Svalbard continental margin (2008–2014). Three seepage areas emit in total 725–1,125 t CH4/year, and bubble fluxes are up to 2 kg·m−2·year−1. Bubble fluxes vary between different surveys, but no clear trend can be identified. Flux variability analyses suggest that two areas are geologically interconnected, displaying alternating flow changes. Spatial migration of bubble seepage was observed to follow seasonal changes in the theoretical landward limit of the hydrate stability zone, suggesting that formation/dissociation of shallow hydrates, modulated by bottom water temperatures, influences seafloor bubble release.

Idioma originalEnglish
Páginas (desde-hasta)9072-9081
Número de páginas10
PublicaciónGeophysical Research Letters
Volumen46
N.º15
DOI
EstadoPublished - 16 ago 2019

Huella dactilar

bubble
bubbles
methane
seepage
underwater acoustics
hydrates
flow velocity
expeditions
water temperature
survey method
continental shelves
bottom water
marine sediment
continental margin
sediments
seafloor
warming
water column
dissociation
trends

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Citar esto

Veloso-Alarcón, M. E., Jansson, P., De Batist, M., Minshull, T. A., Westbrook, G. K., Pälike, H., ... Greinert, J. (2019). Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard. Geophysical Research Letters, 46(15), 9072-9081. https://doi.org/10.1029/2019GL082750
Veloso-Alarcón, Mario E. ; Jansson, Pär ; De Batist, Marc ; Minshull, Timothy A. ; Westbrook, Graham K. ; Pälike, Heiko ; Bünz, Stefan ; Wright, Ian ; Greinert, Jens. / Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard. En: Geophysical Research Letters. 2019 ; Vol. 46, N.º 15. pp. 9072-9081.
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Veloso-Alarcón, ME, Jansson, P, De Batist, M, Minshull, TA, Westbrook, GK, Pälike, H, Bünz, S, Wright, I & Greinert, J 2019, 'Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard', Geophysical Research Letters, vol. 46, n.º 15, pp. 9072-9081. https://doi.org/10.1029/2019GL082750

Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard. / Veloso-Alarcón, Mario E.; Jansson, Pär; De Batist, Marc; Minshull, Timothy A.; Westbrook, Graham K.; Pälike, Heiko; Bünz, Stefan; Wright, Ian; Greinert, Jens.

En: Geophysical Research Letters, Vol. 46, N.º 15, 16.08.2019, p. 9072-9081.

Resultado de la investigación: Article

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T1 - Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard

AU - Veloso-Alarcón, Mario E.

AU - Jansson, Pär

AU - De Batist, Marc

AU - Minshull, Timothy A.

AU - Westbrook, Graham K.

AU - Pälike, Heiko

AU - Bünz, Stefan

AU - Wright, Ian

AU - Greinert, Jens

PY - 2019/8/16

Y1 - 2019/8/16

N2 - Large reservoirs of methane present in Arctic marine sediments are susceptible to rapid warming, promoting increasing methane emissions. Gas bubbles in the water column can be detected, and flow rates can be quantified using hydroacoustic survey methods, making it possible to monitor spatiotemporal variability. We present methane (CH4) bubble flow rates derived from hydroacoustic data sets acquired during 11 research expeditions to the western Svalbard continental margin (2008–2014). Three seepage areas emit in total 725–1,125 t CH4/year, and bubble fluxes are up to 2 kg·m−2·year−1. Bubble fluxes vary between different surveys, but no clear trend can be identified. Flux variability analyses suggest that two areas are geologically interconnected, displaying alternating flow changes. Spatial migration of bubble seepage was observed to follow seasonal changes in the theoretical landward limit of the hydrate stability zone, suggesting that formation/dissociation of shallow hydrates, modulated by bottom water temperatures, influences seafloor bubble release.

AB - Large reservoirs of methane present in Arctic marine sediments are susceptible to rapid warming, promoting increasing methane emissions. Gas bubbles in the water column can be detected, and flow rates can be quantified using hydroacoustic survey methods, making it possible to monitor spatiotemporal variability. We present methane (CH4) bubble flow rates derived from hydroacoustic data sets acquired during 11 research expeditions to the western Svalbard continental margin (2008–2014). Three seepage areas emit in total 725–1,125 t CH4/year, and bubble fluxes are up to 2 kg·m−2·year−1. Bubble fluxes vary between different surveys, but no clear trend can be identified. Flux variability analyses suggest that two areas are geologically interconnected, displaying alternating flow changes. Spatial migration of bubble seepage was observed to follow seasonal changes in the theoretical landward limit of the hydrate stability zone, suggesting that formation/dissociation of shallow hydrates, modulated by bottom water temperatures, influences seafloor bubble release.

KW - bubbles

KW - flux

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KW - Svalbard

KW - temporal variability

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Veloso-Alarcón ME, Jansson P, De Batist M, Minshull TA, Westbrook GK, Pälike H y otros. Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard. Geophysical Research Letters. 2019 ago 16;46(15):9072-9081. https://doi.org/10.1029/2019GL082750