气候变化领域集成服务门户(CCPortal): Multi-proxy approach to unravel methane emission history of an Arctic cold seep

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DOI	10.1016/j.quascirev.2020.106490
	Multi-proxy approach to unravel methane emission history of an Arctic cold seep
	Yao H.; Niemann H.; Panieri G.
发表日期	2020
ISSN	0277-3791
卷号	244
英文摘要	Arctic Ocean sediments contain large amounts of methane in the form of free gas and gas hydrate. This highly dynamic methane reservoir is susceptible to be modified by bottom water warming. The warming may lead to gas hydrate destabilization releasing elevated methane fluxes to the seafloor and seawater. Reconstructing past methane dynamics can be achieved by using specific proxies left in the geological record. In this study, we apply a multi-proxy approach for paleo seepage reconstruction from sediment records at gas hydrate mounds (GHMs) in Storfjordrenna (south of the Svalbard archipelago). These shallow water (∼380 m water depth) systems are potentially vulnerable to global warming related temperature changes. 14C dating of foraminifera shells indicated an onset of deglaciation in the Storfjordrenna region at ∼20 kyr BP and allowed us to establish a stratigraphic context based on sediment Zr/Rb and Fe/Ca ratios. Several major (between 15 and 17 kyr BP) and minor methane venting phases were identified and interpreted to be related to gas hydrate instability triggered by isostatic adjustment right after the onset of the deglaciation. The detection of all major methane releases was only possible by combining data sets of stable carbon isotope compositions of foraminifera, mineralogy and δ13C values of authigenic carbonates, and abundance and stable carbon isotope signatures of lipid biomarkers. The most robust single proxy in this study was provided by the δ13C values of archaeal biomarkers. In contrast, the sediment Ba/Ti ratios recorded only the major events. Our results highlight the complexity and heterogeneity of methane dynamics in a small area of some hundred meters across. © 2020 The Author(s)
英文关键词	Authigenic carbonates; Carbon isotopes; Foraminifera; Lipid biomarkers; Methane seepage reconstruction; Proxies
语种	英语
scopus关键词	Biomarkers; Carbon; Gases; Global warming; Hydration; Hydrocarbon seepage; Isotopes; Methane; Minerals; Sediments; Stratigraphy; Authigenic carbonates; Bottom-water warming; Foraminifera shells; Methane emissions; Methane reservoirs; Stable carbon isotope compositions; Stable carbon isotopes; Temperature changes; Gas hydrates; abundance; bottom water; carbon isotope; cold seep; deglaciation; foraminifera; gas hydrate; global warming; methane; seepage; shallow water; Arctic; Arctic Ocean; Svalbard; Svalbard and Jan Mayen; Archaea; Foraminifera
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151350
作者单位	CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT the Arctic University of Norway in Tromsø, Norway; NIOZ Royal Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, And Utrecht University, P.O. Box 59, AB Den Burg, Texel, 1790, Netherlands; Department of Environmental Sciences, University of Basel, Bernoullistrasse 30, Basel, CH-4056, Switzerland
推荐引用方式 GB/T 7714	Yao H.,Niemann H.,Panieri G.. Multi-proxy approach to unravel methane emission history of an Arctic cold seep[J],2020,244.
APA	Yao H.,Niemann H.,&Panieri G..(2020).Multi-proxy approach to unravel methane emission history of an Arctic cold seep.Quaternary Science Reviews,244.
MLA	Yao H.,et al."Multi-proxy approach to unravel methane emission history of an Arctic cold seep".Quaternary Science Reviews 244(2020).