气候变化领域集成服务门户(CCPortal): Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska

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DOI	10.1088/1748-9326/abb493
	Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska
	O'Dwyer M.; Butman D.E.; Striegl R.G.; Dornblaser M.M.; Wickland K.P.; Kuhn C.D.; Bogard M.J.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoulder seasons. To better define patterns of under ice GHG content (and emissions potential at spring thaw), we surveyed carbon dioxide (CO2) and methane (CH4) concentrations and stable isotopic composition during winter of 2017 in 13 lakes in the arid Yukon Flats Basin of interior Alaska, USA. Partial pressures of CO2 and CH4 ranged over three orders of magnitude, were positively correlated, and CO2 exceeded CH4 at all but one site. Shallow, organic matter-rich lakes located at lower elevations tended to have the highest concentrations of both gases, though CH4 content was more heterogeneous and only abundant in oxygen-depleted lakes, while CO2 was negatively correlated to oxygen content. Isotopic values of CO2 spanned a narrow range (-10‰ to-23‰) compared to CH4, which ranged over 50‰ (-19‰ to-71‰), indicating CH4 source pathways and sink strength varied widely between lakes. Miller-Tans and Keeling plots qualitatively suggested two groups of lakes were present; one with isotopically enriched source CH4 possibly more dominated by acetoclastic methanogenesis, and one with depleted signatures suggesting a dominance of the hydrogenotrophic production. Overall, regional lake differences in winter under ice GHG content appear to track landscape position, oxygen, and organic matter content and composition, causing patterns to vary widely even within a relatively small geographic area of interior Alaska. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Alaska; boreal; CH4; CO2; lake; stable isotopes; winter
语种	英语
scopus关键词	Biogeochemistry; Budget control; Carbon dioxide; Gas emissions; Ice; Isotopes; Lakes; Organic compounds; Oxygen; Geographic areas; Isotopic composition; Isotopically enriched; Landscape positions; Organic matter content; Seasonal patterns; Stable isotopic compositions; Three orders of magnitude; Greenhouse gases; greenhouse gas; ice; isotopic composition; lake water; Alaska; United States
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153586
作者单位	School of Environmental and Forest Sciences, University of Washington, Seattle, WA, United States; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States; United States Geological Survey, Boulder, CO, United States; Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, Canada
推荐引用方式 GB/T 7714	O'Dwyer M.,Butman D.E.,Striegl R.G.,et al. Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska[J],2020,15(10).
APA	O'Dwyer M..,Butman D.E..,Striegl R.G..,Dornblaser M.M..,Wickland K.P..,...&Bogard M.J..(2020).Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska.Environmental Research Letters,15(10).
MLA	O'Dwyer M.,et al."Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska".Environmental Research Letters 15.10(2020).