气候变化领域集成服务门户(CCPortal): A synthesis of methane dynamics in thermokarst lake environments

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DOI	10.1016/j.earscirev.2020.103365
	A synthesis of methane dynamics in thermokarst lake environments
	Heslop J.K.; Walter Anthony K.M.; Winkel M.; Sepulveda-Jauregui A.; Martinez-Cruz K.; Bondurant A.; Grosse G.; Liebner S.
发表日期	2020
ISSN	00128252
卷号	210
英文摘要	Greenhouse gas emissions from physical permafrost thaw disturbance and subsidence, including the formation and expansion of thermokarst (thaw) lakes, may double the magnitude of the permafrost carbon feedback this century. These processes are not accounted for in current global climate models. Thermokarst lakes, in particular, have been shown to be hotspots for emissions of methane (CH4), a potent greenhouse gas with 32 times more global warming potential than carbon dioxide (CO2) over a 100-year timescale. Here, we synthesize several studies examining CH4 dynamics in a representative first-generation thermokarst lake (Vault Lake, informal name) to show that CH4 production and oxidation potentials vary with depth in thawed sediments beneath the lake. This variation leads to depth-dependent differences in both in situ dissolved CO2:CH4 ratios and net CH4 production responses to additional warming. Comparing CH4 production, oxidation, and flux values from studies at Vault Lake suggests up to 99% of produced CH4 is oxidized and/or periodically entrapped before entering the atmosphere. We summarize these findings in the context of CH4 literature from thermokarst lakes and identify future research directions for incorporating thermokarst lake CH4 dynamics into estimates of the permafrost carbon feedback. © 2020 Elsevier B.V.
关键词	Methane Methane oxidation Permafrost carbon feedback Rapid thaw
英文关键词	greenhouse gas; karst hydrology; lacustrine environment; methane; oxidation; permafrost; thermokarst; warming
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203741
作者单位	GFZ German Research Centre for Geosciences, Section 3.7 Geomicrobiology, Helmholtz Centre Potsdam, Potsdam, Germany; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; GFZ German Research Centre for Geosciences, Section 3.5 Interface Geochemistry, Helmholtz Centre Potsdam, Potsdam, Germany; Environmental Biogeochemistry in Extreme Ecosystems Laboratory (EnBEELab), University of Magallanes, Punta Arenas, Chile; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; University of Potsdam, Institute of Geosciences, Potsdam, Germany; University of Potsdam, Institute of Biochemistry and Biology, Potsdam, Germany
推荐引用方式 GB/T 7714	Heslop J.K.,Walter Anthony K.M.,Winkel M.,et al. A synthesis of methane dynamics in thermokarst lake environments[J],2020,210.
APA	Heslop J.K..,Walter Anthony K.M..,Winkel M..,Sepulveda-Jauregui A..,Martinez-Cruz K..,...&Liebner S..(2020).A synthesis of methane dynamics in thermokarst lake environments.Earth Science Reviews,210.
MLA	Heslop J.K.,et al."A synthesis of methane dynamics in thermokarst lake environments".Earth Science Reviews 210(2020).