气候变化领域集成服务门户(CCPortal): Surface Methane Concentrations Along the Mid-Atlantic Bight Driven by Aerobic Subsurface Production Rather Than Seafloor Gas Seeps

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DOI	10.1029/2019JC015989
	Surface Methane Concentrations Along the Mid-Atlantic Bight Driven by Aerobic Subsurface Production Rather Than Seafloor Gas Seeps
	Leonte M.; Ruppel C.D.; Ruiz-Angulo A.; Kessler J.D.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Relatively minor amounts of methane, a potent greenhouse gas, are currently emitted from the oceans to the atmosphere, but such methane emissions have been hypothesized to increase as oceans warm. Here, we investigate the source, distribution, and fate of methane released from the upper continental slope of the U.S. Mid-Atlantic Bight, where hundreds of gas seeps have been discovered between the shelf break and ~1,600 m water depth. Using physical, chemical, and isotopic analyses, we identify two main sources of methane in the water column: seafloor gas seeps and in situ aerobic methanogenesis which primarily occurs at 100–200 m depth in the water column. Stable isotopic analyses reveal that water samples collected at all depths were significantly impacted by aerobic methane oxidation, the dominant methane sink in this region, with the average fraction of methane oxidized being 50%. Due to methane oxidation in the deeper water column, below 200 m depth, surface concentrations of methane are influenced more by methane sources found near the surface (0–10 m depth) and in the subsurface (10–200 m depth), rather than seafloor emissions at greater depths. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	gas seeps; isotopes; methane; mid Atlantic bight; ocean; oxidation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186882
作者单位	Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States; U.S. Geological Survey, Woods Hole, MA, United States; Icelandic Meteorological Office, Reykjavik, Iceland
推荐引用方式 GB/T 7714	Leonte M.,Ruppel C.D.,Ruiz-Angulo A.,et al. Surface Methane Concentrations Along the Mid-Atlantic Bight Driven by Aerobic Subsurface Production Rather Than Seafloor Gas Seeps[J],2020,125(5).
APA	Leonte M.,Ruppel C.D.,Ruiz-Angulo A.,&Kessler J.D..(2020).Surface Methane Concentrations Along the Mid-Atlantic Bight Driven by Aerobic Subsurface Production Rather Than Seafloor Gas Seeps.Journal of Geophysical Research: Oceans,125(5).
MLA	Leonte M.,et al."Surface Methane Concentrations Along the Mid-Atlantic Bight Driven by Aerobic Subsurface Production Rather Than Seafloor Gas Seeps".Journal of Geophysical Research: Oceans 125.5(2020).