Hydrate formation significantly decreases the uplifting rate of methane bubble from the seafloor to the upper water column

Feng, Jingchun; Xie, Yan; Tang, Li; Li, Pian; Zhou, Zhenwu; Zhang, Si; Yang, Zhifeng; Wang, Yi

doi:10.1016/j.scib.2023.09.005

Cited by 7 publications

(7 citation statements)

References 12 publications

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“…This similar method has been previously reported. 7 After the target dissolved methane concentration was realized, the inlet and outlet valves were closed. Then, CH 4 hydrate was rapidly nucleated and grown in the gas−liquid interface with artificial perturbation.…”

Section: Methodsmentioning

confidence: 99%

“…23 This phenomenon is entirely different from the experiment involving continuous bubbling during hydrate formation. In the experiment of Feng et al 7 with continuous methane gas bubbling in saline water systems, after hydrates formed at the gas−liquid interface, a large number of flocculent-like hydrates formed rapidly in the whole aqueous phase due to the disturbance caused by methane bubble seeping, leading to the dissolved methane concentration in the aqueous phase reaching the concentration at the gas−water− hydrate three-phase equilibrium condition within approximately 3 min. We consider that the significant differences between the two experiments mainly stem from the differences of spatial hydrate crystal distribution and mass transfer capacity of methane in the water phase.…”

Section: Characteristics Of Hydrate Formation In Pure Water and Salin...mentioning

confidence: 99%

“…Additionally, the distance from the seepage vent can also lead to differences in dissolved methane content. 7 Therefore, investigating the transformation characteristics of hydrates under different initial dissolved methane concentrations is of paramount significance in understanding the various collaborative conversion processes of methane in seafloor seepage areas. This is also a key aspect in estimating the impact of seafloor methane seepage on marine and atmospheric carbon cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Methane released from seafloor seepage undergoes a series of complex transformation reactions during its migration through the seabed sediment layer and the marine water column, including methane dissolution, microbial oxidation, chemical conversion, and the formation of solid-phase hydratesplaying a crucial role in effectively intercepting the substantial emissions of methane from the seafloor into the atmosphere. , Notably, the dissolved methane content in seawater can directly influence the microbial absorption process while also affecting the nucleation and growth characteristics of methane conversion to hydrates . In comparison to other reactions, the methane hydrate conversion process on the deep seabed is both more rapid and more pronounced.…”

Section: Introductionmentioning

confidence: 99%

“…Due to varying methane seepage fluxes in different seafloor seepage zones, there are divergent dissolved methane concentrations in seawater. Additionally, the distance from the seepage vent can also lead to differences in dissolved methane content . Therefore, investigating the transformation characteristics of hydrates under different initial dissolved methane concentrations is of paramount significance in understanding the various collaborative conversion processes of methane in seafloor seepage areas.…”

Section: Introductionmentioning

confidence: 99%

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Hydrate Formation and Methane Mass Transfer Characteristics in Static Systems of Pure Water and Saline Water with Varied Initial Dissolved Methane Concentrations

Wang,

Feng,

Xie

et al. 2024

Energy Fuels

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Methane seepage from deep-sea seabeds is an important carbon and energy source in the ocean, exerting significant impacts on marine and global environments and ecosystems. The conversion characteristics of dissolved methane to solid hydrates not only influence the variation pathways of seeping methane but also play a crucial role in methane's biological and chemical transformation processes. The dissolved methane concentration around seafloor methane seepage vents varies with distance, yet the hydrate transformation characteristics with different concentrations of dissolved methane remain unclear. In this study, the hydrate formation and methane mass transfer characteristics in static systems of pure water and saline water with different initial dissolved methane concentrations were investigated. The experimental results indicated that the slow mass transfer process of methane molecules in the water phase was a key limiting factor for the conversion of dissolved methane into hydrates. Compared to pure water, the lower mass transfer coefficient of methane in saline water further restricted the hydrate formation and also slowed the process of methane gas dissolution. Although differences were observed in the growth status of interfacial hydrates for different experiments, resulting in smooth or needle-like hydrate membranes, this did not significantly affect the conversion of gaseous methane to hydrates. The findings of this study provide foundational data and theoretical support for understanding the fate of methane in systems with varying initial dissolved methane concentrations.

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Section: Methodsmentioning

confidence: 99%

Section: Characteristics Of Hydrate Formation In Pure Water and Salin...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%