气候变化领域集成服务门户(CCPortal): Reduced methane seepage from Arctic sediments during cold bottom-water conditions

CCPortal

DOI	10.1038/s41561-019-0515-3
	Reduced methane seepage from Arctic sediments during cold bottom-water conditions
	Ferré B.; Jansson P.G.; Moser M.; Serov P.; Portnov A.; Graves C.A.; Panieri G.; Gründger F.; Berndt C.; Lehmann M.F.; Niemann H.
发表日期	2020
ISSN	17520894
卷号	13 期号:2
英文摘要	Large amounts of methane are trapped within gas hydrate in subseabed sediments in the Arctic Ocean, and bottom-water warming may induce the release of methane from the seafloor. Yet the effect of seasonal temperature variations on methane seepage activity remains unknown as surveys in Arctic seas are conducted mainly in summer. Here we compare the activity of cold seeps along the gas hydrate stability limit offshore Svalbard during cold (May 2016) and warm (August 2012) seasons. Hydro-acoustic surveys revealed a substantially decreased seepage activity during cold bottom-water conditions, corresponding to a 43% reduction of total cold seeps and methane release rates compared with warmer conditions. We demonstrate that cold seeps apparently hibernate during cold seasons, when more methane gas becomes trapped in the subseabed sediments. Such a greenhouse gas capacitor increases the potential for methane release during summer months. Seasonal bottom-water temperature variations are common on the Arctic continental shelves. We infer that methane-seep hibernation is a widespread phenomenon that is underappreciated in global methane budgets, leading to overestimates in current calculations. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	bottom water; continental shelf; gas hydrate; greenhouse gas; methane; seafloor; seasonal variation; seepage; Arctic; Arctic Ocean; Svalbard; Svalbard and Jan Mayen
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124507
作者单位	Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), Department of Geosciences, The Arctic University of Norway, Tromsø, Norway; School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Environmental Science, University of Basel, Basel, Switzerland; NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, and Utrecht University, ‘t Horntje, Netherlands; Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Centre for Environment, Fisheries and Aquaculture Science (Cefas), Lowestoft, Suffolk, United Kingdom
推荐引用方式 GB/T 7714	Ferré B.,Jansson P.G.,Moser M.,et al. Reduced methane seepage from Arctic sediments during cold bottom-water conditions[J],2020,13(2).
APA	Ferré B..,Jansson P.G..,Moser M..,Serov P..,Portnov A..,...&Niemann H..(2020).Reduced methane seepage from Arctic sediments during cold bottom-water conditions.Nature Geoscience,13(2).
MLA	Ferré B.,et al."Reduced methane seepage from Arctic sediments during cold bottom-water conditions".Nature Geoscience 13.2(2020).