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DOI	10.1073/pnas.2006024117
	Diel variability of methane emissions from lakes
	Sieczko A.K.; Thanh Duc N.; Schenk J.; Pajala G.; Rudberg D.; Sawakuchi H.O.; Bastviken D.
发表日期	2020
ISSN	0027-8424
起始页码	21488
结束页码	21494
卷号	117 期号:35
英文摘要	Lakes are considered the second largest natural source of atmospheric methane (CH4). However, current estimates are still uncertain and do not account for diel variability of CH4 emissions. In this study, we performed high-resolution measurements of CH4 flux from several lakes, using an automated and sensor-based flux measurement approach (in total 4,580 measurements), and demonstrated a clear and consistent diel lake CH4 flux pattern during stratification and mixing periods. The maximum of CH4 flux were always noted between 10:00 and 16:00, whereas lower CH4 fluxes typically occurred during the nighttime (00:00–04:00). Regardless of the lake, CH4 emissions were on an average 2.4 higher during the day compared to the nighttime. Fluxes were higher during daytime on nearly 80% of the days. Accordingly, estimates and extrapolations based on daytime measurements only most likely result in overestimated fluxes, and consideration of diel variability is critical to properly assess the total lake CH4 flux, representing a key component of the global CH4 budget. Hence, based on a combination of our data and additional literature information considering diel variability across latitudes, we discuss ways to derive a diel variability correction factor for previous measurements made during daytime only. © This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).
英文关键词	Automated flux chambers; Diel variability; Lake greenhouse gas emissions; Methane fluxes
语种	英语
scopus关键词	methane; surface water; methane; accuracy; Article; atmospheric pressure; carbon footprint; climate change; concentration (parameter); diffusion; environmental monitoring; lake ecosystem; latitude; oxidation; physical chemistry; priority journal; sediment; surface property; biosynthesis; chemistry; circadian rhythm; lake; season; Circadian Rhythm; Environmental Monitoring; Lakes; Methane; Seasons
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160825
作者单位	Sieczko, A.K., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden; Thanh Duc, N., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden; Schenk, J., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden; Pajala, G., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden; Rudberg, D., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden; Sawakuchi, H.O., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden, Department of Ecology and Environmental Sciences, Umeå Universitet, Umeå, 901 87, Sweden; Bastviken, D., Department of Thematic Studies–Environmental Change, Linköping University, Linköping, 58183, Sweden
推荐引用方式 GB/T 7714	Sieczko A.K.,Thanh Duc N.,Schenk J.,et al. Diel variability of methane emissions from lakes[J],2020,117(35).
APA	Sieczko A.K..,Thanh Duc N..,Schenk J..,Pajala G..,Rudberg D..,...&Bastviken D..(2020).Diel variability of methane emissions from lakes.Proceedings of the National Academy of Sciences of the United States of America,117(35).
MLA	Sieczko A.K.,et al."Diel variability of methane emissions from lakes".Proceedings of the National Academy of Sciences of the United States of America 117.35(2020).