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Atmospheric Monitoring of Methane in Beijing Using a Mobile Observatory.
- Source :
- Atmosphere; Sep2019, Vol. 10 Issue 9, p554-554, 1p
- Publication Year :
- 2019
-
Abstract
- Cities have multiple fugitive emission sources of methane (CH<subscript>4</subscript>) 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 CH<subscript>4</subscript> inventory. In this study, a mobile observatory was used to monitor the real-time CH<subscript>4</subscript> 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" (CH<subscript>4</subscript>:CO<subscript>2</subscript>) for an LNG carrier, LNG filling station, and LNG power plant show a shape of "L"; for city observations, the distribution of CH<subscript>4</subscript> 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 CO<subscript>2</subscript> and CH<subscript>4</subscript> concentrations were found in the rural area but in the urban area there were no such significant correlations; a shape of "L" of CH<subscript>4</subscript>:CO<subscript>2</subscript> 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 CH<subscript>4</subscript> sources in Beijing and the observation results could improve the CH<subscript>4</subscript> inventory and inform relevant policy-making on emission reduction in China. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734433
- Volume :
- 10
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Atmosphere
- Publication Type :
- Academic Journal
- Accession number :
- 138961402
- Full Text :
- https://doi.org/10.3390/atmos10090554