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- W3201620582 abstract "Abstract Current estimations of seabed methane release into the ocean (0.4–48 Tg yr −1 ) are based on short‐term observations and implicitly assume that fluxes are constant over time. However, the intensity of gas seepage varies significantly throughout a seep lifetime. We used instruments operated by the Ocean Observatories Initiative's Regional Cabled Array to monitor variations of gas emissions over the entire Southern Hydrate Ridge summit. We show that bubble plumes emanate from distinct and persistent vents. Multiple plumes can occur within each vent and the location of their outlets may shift progressively. Active bubble plumes vary temporally in number and intensity, even within single vents. Gas emission fluctuations are partly periodic and linked to the local tide. However, short‐term variability and high ebullition events unrelated to tidal cycles are also commonly observed. Our data indicate that small‐scale processes beneath or at the sediment surface are responsible for the short‐term variability of the venting activity that is otherwise modulated by tides. Furthermore, a decrease of venting at one vent may coincide with an increase in plume activity at other vents. Our results depict a spatially and temporally dynamic seep environment, the variability of which cannot be fully characterized without systematic and comprehensive monitoring of the entire area. These results indicate that flux estimations may be largely overestimated or underestimated depending on the time, duration, and place of observation. Although sudden ebullition bursts are hardly predictable, we argue that tidal cycles must be taken into consideration when estimating gas fluxes." @default.
- W3201620582 created "2021-09-27" @default.
- W3201620582 creator A5011612137 @default.
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- W3201620582 creator A5039161868 @default.
- W3201620582 creator A5050020578 @default.
- W3201620582 creator A5063550735 @default.
- W3201620582 date "2021-10-01" @default.
- W3201620582 modified "2023-10-14" @default.
- W3201620582 title "Variability of Natural Methane Bubble Release at Southern Hydrate Ridge" @default.
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