气候变化领域集成服务门户(CCPortal): Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes

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DOI	10.5194/hess-24-6047-2020
	Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes
	Thalasso F.; Walter Anthony K.; Irzak O.; Chaleff E.; Barker L.; Anthony P.; Hanke P.; Gonzalez-Valencia R.
发表日期	2020
ISSN	1027-5606
起始页码	6047
结束页码	6058
卷号	24 期号:12
英文摘要	Methane (CH4) seepage (i.e., steady or episodic flow of gaseous hydrocarbons from subsurface reservoirs) has been identified as a significant source of atmospheric CH4. However, radiocarbon data from polar ice cores have recently brought into question the magnitude of fossil CH4 seepage naturally occurring. In northern high latitudes, seepage of subsurface CH4 is impeded by permafrost and glaciers, which are under an increasing risk of thawing and melting in a globally warming world, implying the potential release of large stores of CH4 in the future. Resolution of these important questions requires a better constraint and monitoring of actual emissions from seepage areas. The measurement of these seeps is challenging, particularly in aquatic environments, because they involve large and irregular gas flow rates, unevenly distributed both spatially and temporally. Large macroseeps are particularly difficult to measure due to a lack of lightweight, inexpensive methods that can be deployed in remote Arctic environments. Here, we report the use of a mobile chamber for measuring emissions at the surface of ice-free lakes subject to intense CH4 macroseepage. Tested in a remote Alaskan lake, the method was validated for the measurement of fossil CH4 emissions of up to 1.08×104 gCH4 m-2 d-1 (13.0 Lm-2 min-1 of 83.4% CH4 bubbles), which is within the range of global fossil methane seepage and several orders of magnitude above standard ecological emissions from lakes. In addition, this method allows for low diffusive flux measurements. Thus, the mobile chamber approach presented here covers the entire magnitude range of CH4 emissions currently identified from those standardly observed in lakes to intense macroseeps, with a single apparatus of moderate cost. © Author(s) 2020.
语种	英语
scopus关键词	Atmospheric movements; Flow of gases; Hydrocarbon seepage; Lakes; Methane; Aquatic environments; Arctic environments; Gaseous hydrocarbon; Methane seepages; Naturally occurring; Orders of magnitude; Radiocarbon data; Subsurface reservoir; Flow rate; lake ecosystem; measurement method; methane; open-top chamber
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159226
作者单位	Thalasso, F., Biotechnology and Bioengineering Department, Cinvestav, Avenida IPN 2508, Mexico City, 07360, Mexico; Walter Anthony, K., Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States, International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Irzak, O., Frost Methane, Oakland, CA 94612, United States; Chaleff, E., Frost Methane, Oakland, CA 94612, United States; Barker, L., Frost Methane, Oakland, CA 94612, United States; Anthony, P., Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Hanke, P., Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Gonzalez-Valencia, R., Biotechnology and Bioengineering Department, Cinvestav, Avenida IPN 2508, Mexico City, 07360, Mexico
推荐引用方式 GB/T 7714	Thalasso F.,Walter Anthony K.,Irzak O.,et al. Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes[J],2020,24(12).
APA	Thalasso F..,Walter Anthony K..,Irzak O..,Chaleff E..,Barker L..,...&Gonzalez-Valencia R..(2020).Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes.Hydrology and Earth System Sciences,24(12).
MLA	Thalasso F.,et al."Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes".Hydrology and Earth System Sciences 24.12(2020).