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Emissions of volatile organic compounds inferred from airborne flux measurements over a megacity
| Content Provider | Semantic Scholar |
|---|---|
| Author | Karl, Thomas Apel, Eric C. Hodžić, Alma Riemer, Daniel D. Blake, Donald R. Wiedinmyer, Christine |
| Copyright Year | 2008 |
| Abstract | Toluene and benzene are used for assessing the ability to measure disjunct eddy covariance (DEC) fluxes of Volatile Organic Compounds (VOC) using Proton Transfer Reaction Mass Spectrometry (PTR-MS) on aircraft. Statistically significant correlation between vertical wind speed and mixing ratios suggests that airborne VOC eddy covariance (EC) flux measurements using PTR-MS are feasible. City-median midday toluene and benzene fluxes are calculated to be on the order of 14.1 +/- 4.0 mg/m(2)/h and 4.7 +/- 2.3 mg/m(2)/h, respectively. For comparison the adjusted CAM2004 emission inventory estimates toluene fluxes of 10 mg/m(2)/h along the footprint of the flight-track. Wavelet analysis of instantaneous toluene and benzene measurements during city overpasses is tested as a tool to assess surface emission heterogeneity. High toluene to benzene flux ratios above an industrial district (e. g. 10-15 g/g) including the International airport (e. g. 3-5 g/g) and a mean flux (concentration) ratio of 3.2 +/- 0.5 g/g (3.9 +/- 0.3 g/g) across Mexico City indicate that evaporative fuel and industrial emissions play an important role for the prevalence of aromatic compounds. Based on a tracer model, which was constrained by BTEX (BTEX Benzene/Toluene/Ethylbenzene/ m, p, o-Xylenes) compound concentration ratios, the fuel marker methyl-tertiary-butylether (MTBE) and the biomass burning marker acetonitrile (CH3CN), we show that a combination of industrial, evaporative fuel, and exhaust emissions account for > 87% of all BTEX sources. Our observations suggest that biomass burning emissions play a minor role for the abundance of BTEX compounds in the MCMA (2-13%). |
| Starting Page | 271 |
| Ending Page | 285 |
| Page Count | 15 |
| File Format | PDF HTM / HTML |
| DOI | 10.5194/acp-9-271-2009 |
| Volume Number | 9 |
| Alternate Webpage(s) | http://www.atmos-chem-phys.org/9/271/2009/acp-9-271-2009.pdf |
| Alternate Webpage(s) | https://www.atmos-chem-phys-discuss.net/8/14273/2008/acpd-8-14273-2008.pdf |
| Alternate Webpage(s) | http://www.atmos-chem-phys.net/9/271/2009/acp-9-271-2009.pdf |
| Alternate Webpage(s) | https://www.atmos-chem-phys.net/9/271/2009/acp-9-271-2009.pdf |
| Alternate Webpage(s) | http://www.atmos-chem-phys-discuss.net/8/14273/2008/acpd-8-14273-2008.pdf |
| Alternate Webpage(s) | https://escholarship.org/content/qt81w526mr/qt81w526mr.pdf?t=q4ieff |
| Alternate Webpage(s) | https://cloudfront.escholarship.org/dist/prd/content/qt6bz39110/qt6bz39110.pdf |
| Alternate Webpage(s) | https://doi.org/10.5194/acp-9-271-2009 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
