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Atmospheric Monitoring of Methane in Beijing Using a Mobile Observatory

1
Meteorological Observation Centre of China Meteorological Administration, 100081 Beijing, China
2
Center for Environmental Progress, Wuhan 430070, China
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Hebei Institute of Meteorological Sciences, Shijiazhuang 050021, China
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State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
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State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
5
Chinese Academy of Meteorological Sciences, 100081 Beijing, China
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(9), 554; https://doi.org/10.3390/atmos10090554
Received: 11 August 2019 / Revised: 7 September 2019 / Accepted: 12 September 2019 / Published: 16 September 2019
(This article belongs to the Section Air Quality)
Cities have multiple fugitive emission sources of methane (CH4) and policies adopted by China on replacing coal with natural gas in recent years can cause fine spatial heterogeneities at the range of kilometers within a city and also contribute to the CH4 inventory. In this study, a mobile observatory was used to monitor the real-time CH4 concentrations at fine spatial and temporal resolutions in Beijing, the most important pilot city of energy transition. Results showed that: several point sources, such as a liquefied natural gas (LNG) power plant which has not been included in the Chinese national greenhouse gas inventory yet, can be identified; the ratio “fingerprints” (CH4:CO2) for an LNG carrier, LNG filling station, and LNG power plant show a shape of “L”; for city observations, the distribution of CH4 concentration, in the range of 1940–2370 ppbv, had small variations while that in the rural area had a much higher concentration gradient; significant correlations between CO2 and CH4 concentrations were found in the rural area but in the urban area there were no such significant correlations; a shape of “L” of CH4:CO2 ratios is obtained in the urban area in wintertime and it is assigned to fugitive emissions from LNG sources. This mobile measurement methodology is capable of monitoring point and non-point CH4 sources in Beijing and the observation results could improve the CH4 inventory and inform relevant policy-making on emission reduction in China. View Full-Text
Keywords: mobile measurement; methane; atmospheric concentration; source apportionment mobile measurement; methane; atmospheric concentration; source apportionment
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MDPI and ACS Style

Sun, W.; Deng, L.; Wu, G.; Wu, L.; Han, P.; Miao, Y.; Yao, B. Atmospheric Monitoring of Methane in Beijing Using a Mobile Observatory. Atmosphere 2019, 10, 554.

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