气候变化领域集成服务门户(CCPortal): Continuous CH4 and delta(CH4)-C-13 measurements in London demonstrate under-reported natural gas leakage

CCPortal

DOI	10.5194/acp-22-3595-2022
	Continuous CH4 and delta(CH4)-C-13 measurements in London demonstrate under-reported natural gas leakage
	Saboya, Eric; Zazzeri, Giulia; Graven, Heather; Manning, Alistair J.; Michel, Sylvia Englund
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3595
结束页码	3613
卷号	22 期号:5 页码:19
英文摘要	Top-down greenhouse gas measurements can be used to independently assess the accuracy of bottomup emission estimates. We report atmospheric methane (CH4) mole fractions and delta(CH4)-C-13 measurements from Imperial College London from early 2018 onwards using a Picarro G2201-i analyser. Measurements from March 2018 to October 2020 were compared to simulations of CH4 mole fractions and ffi delta(CH4)-C-13 produced using the NAME (Numerical Atmospheric-dispersion Modelling Environment) dispersion model coupled with the UK National Atmospheric Emissions Inventory, UK NAEI, and a global inventory, the Emissions Database for Global Atmospheric Research (EDGAR), with model spatial resolutions of similar to 2, similar to 10, and similar to 25 km. Simulation-measurement comparisons are used to evaluate London emissions and the source apportionment in the global (EDGAR) and UK national (NAEI) emission inventories. Observed mole fractions were underestimated by 30 %-35% in the NAEI simulations. In contrast, a good correspondence between observations and EDGAR simulations was seen. There was no correlation between the measured and simulated delta(CH4)-C-13 values for either NAEI or EDGAR, however, suggesting the inventories' sectoral attributions are incorrect. On average, natural gas sources accounted for 20%-28% of the above background CH4 in the NAEI simulations and only 6%-9% in the EDGAR simulations. In contrast, nearly 84% of isotopic source values calculated by Keeling plot analysis (using measurement data from the afternoon) of individual pollution events were higher than -45 parts per thousand, suggesting the primary CH4 sources in London are actually natural gas leaks. The simulation-observation comparison of CH4 mole fractions suggests that total emissions in London are much higher than the NAEI estimate (0.04 TgCH(4) yr(-1)) but close to, or slightly lower than, the EDGAR estimate (0.10 TgCH(4) yr(-1)). However, the simulation-observation comparison of delta(CH4)-C-13 and the Keeling plot results indicate that emissions due to natural gas leaks in London are being underestimated in both the UK NAEI and EDGAR.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000772230800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273790
作者单位	Imperial College London; Imperial College London; Met Office - UK; University of Colorado System; University of Colorado Boulder
推荐引用方式 GB/T 7714	Saboya, Eric,Zazzeri, Giulia,Graven, Heather,et al. Continuous CH4 and delta(CH4)-C-13 measurements in London demonstrate under-reported natural gas leakage[J],2022,22(5):19.
APA	Saboya, Eric,Zazzeri, Giulia,Graven, Heather,Manning, Alistair J.,&Michel, Sylvia Englund.(2022).Continuous CH4 and delta(CH4)-C-13 measurements in London demonstrate under-reported natural gas leakage.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(5),19.
MLA	Saboya, Eric,et al."Continuous CH4 and delta(CH4)-C-13 measurements in London demonstrate under-reported natural gas leakage".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.5(2022):19.