气候变化领域集成服务门户(CCPortal): Irregular BSR: Evidence of an Ongoing Reequilibrium of a Gas Hydrate System

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DOI	10.1029/2020GL089906
	Irregular BSR: Evidence of an Ongoing Reequilibrium of a Gas Hydrate System
	Colin F.; Ker S.; Riboulot V.; Sultan N.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	Gas hydrate (GH) systems constitute methane sinks sensitive to environmental changes such as pressure, temperature, and salinity. It remains a matter of debate as to whether the large GH system of the Black Sea has reached a steady state since the last glacial maximum (LGM). We report on an irregular free gas distribution in specific sediment layers marking an irregular bottom-simulating reflector (BSR). This anomalous free gas distribution revealed by very high resolution seismic images, acquired by a deep-towed multichannel seismic system, might be evidence of an ongoing migration of the base of the GH stability zone (GHSZ). We show that the reequilibrium is not occurring homogeneously as overpressure from hydrate dissociation slows their decomposition in specific sedimentary layers. The Black Sea example highlights that dissociation and the associated methane release in the water column or even in the atmosphere could be largely delayed by overpressure accumulation. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Dissociation; Gases; Hydration; Methane; Seismology; Bottom simulating reflector; Deep-towed multichannel seismic systems; Environmental change; Hydrate dissociation; Last Glacial Maximum; Methane release; Sedimentary layers; Very high resolution seismic; Gas hydrates; decomposition; environmental change; gas hydrate; geoaccumulation; image resolution; methane; overpressure; salinity; sediment chemistry; seismic method; water column; Black Sea
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169542
作者单位	Ifremer, REM-GM, Centre de Brest, Plouzané, France
推荐引用方式 GB/T 7714	Colin F.,Ker S.,Riboulot V.,et al. Irregular BSR: Evidence of an Ongoing Reequilibrium of a Gas Hydrate System[J],2020,47(20).
APA	Colin F.,Ker S.,Riboulot V.,&Sultan N..(2020).Irregular BSR: Evidence of an Ongoing Reequilibrium of a Gas Hydrate System.Geophysical Research Letters,47(20).
MLA	Colin F.,et al."Irregular BSR: Evidence of an Ongoing Reequilibrium of a Gas Hydrate System".Geophysical Research Letters 47.20(2020).