globalchange  > 气候减缓与适应
DOI: 10.1029/2017JG004298
Scopus记录号: 2-s2.0-85052474809
论文题名:
Sediment Characteristics and Methane Ebullition in Three Subarctic Lakes
作者: Wik M.; Johnson J.E.; Crill P.M.; DeStasio J.P.; Erickson L.; Halloran M.J.; Fahnestock M.F.; Crawford M.K.; Phillips S.C.; Varner R.K.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:8
起始页码: 2399
结束页码: 2411
语种: 英语
英文关键词: Arctic ; carbon ; climate ; methane ; northern lakes ; sediment
英文摘要: Ebullition (bubbling) from climate-sensitive northern lakes remains an unconstrained source of atmospheric methane (CH4). Although the focus of many recent studies, ebullition is rarely linked to the physical characteristics of lakes. In this study we analyze the sediments of subarctic postglacial lakes and investigate how sediment properties relate to the large spatial variation in CH4 bubble flux, quantified over multiple years using bubble traps. The results show that the sediments from our lakes are rich in total organic carbon, containing 37 kg/m3 on average. This number is roughly 40% higher than the average for yedoma deposits, which have been identified as high CH4 emitters. However, the quantity of total organic carbon is not a useful indicator of high emissions from the study lakes. Neither is the amount of CH4 in the sediment a reliable measure of ebullition potential. Instead, our data point to coarse detritus, partly from buried submerged aquatic vegetation and redeposited peat as spatial controls on fluxes, often in combination with previously established effects of incoming solar radiation and water depth. The results once again highlight the climate sensitivity of northern lakes, indicating that biological responses to warmer waters and increased energy input and heating of organic sediments during longer ice-free seasons can substantially alter future CH4 emissions. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113370
Appears in Collections:气候减缓与适应

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作者单位: Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States; Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Department of Natural Sciences, University of Maryland Eastern Shore, Princes Anne, MD, United States; Institute of Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States

Recommended Citation:
Wik M.,Johnson J.E.,Crill P.M.,et al. Sediment Characteristics and Methane Ebullition in Three Subarctic Lakes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)
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