气候变化领域集成服务门户(CCPortal): Temperature Proxies as a Solution to Biased Sampling of Lake Methane Emissions

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DOI	10.1029/2020GL088647
	Temperature Proxies as a Solution to Biased Sampling of Lake Methane Emissions
	Jansen J.; Thornton B.F.; Wik M.; MacIntyre S.; Crill P.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Lake emissions of the climate forcing trace gas methane (CH4) are spatiotemporally variable, but biases in flux measurements arising from undersampling are poorly quantified. We use a multiyear data set (2009–2017) of ice-free CH4 emissions from three subarctic lakes obtained with bubble traps (n = 14,677), floating chambers (n = 1,306), and surface concentrations plus a gas transfer model (n = 535) to quantify these biases and evaluate corrections. Sampling primarily in warmer summer months, as is common, overestimates the ice-free season flux by a factor 1.4–1.8. Temperature proxies based on Arrhenius functions that closely fit measured fluxes (R2 ≥ 0.93) enable gap filling the colder months of the ice-free season and reduce sampling bias. Ebullition (activation energy 1.36 eV) expressed greater temperature sensitivity than diffusion (1.00 eV). Resolving seasonal and interannual variability in fluxes with proxies requires ∼135 sampling days for ebullition, and 22 and 14 days for diffusion via models and chambers, respectively. ©2020. The Authors.
英文关键词	Activation energy; Gas emissions; Lakes; Methane; Arrhenius-function; Climate forcings; Flux measurements; Methane emissions; Seasonal and interannual variability; Surface concentration; Temperature proxy; Temperature sensitivity; Ice; climate forcing; concentration (composition); emission; lacustrine environment; methane; sampling bias; seasonal variation; spatiotemporal analysis
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170075
作者单位	Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm, Sweden; Marine Science Institute, University of California, Santa Barbara, Santa Barbara, CA, United States
推荐引用方式 GB/T 7714	Jansen J.,Thornton B.F.,Wik M.,et al. Temperature Proxies as a Solution to Biased Sampling of Lake Methane Emissions[J],2020,47(14).
APA	Jansen J.,Thornton B.F.,Wik M.,MacIntyre S.,&Crill P.M..(2020).Temperature Proxies as a Solution to Biased Sampling of Lake Methane Emissions.Geophysical Research Letters,47(14).
MLA	Jansen J.,et al."Temperature Proxies as a Solution to Biased Sampling of Lake Methane Emissions".Geophysical Research Letters 47.14(2020).