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Secondary organic aerosol origin in an urban environment: in uence of biogenic and fuel combustion precursors M. C. Minguill ´ on, * a N. P ´ erez, a N. Marchand, b A. Bertrand, b B. Temime- Roussel, b K. Agrios, c S. Szidat, c B. van Drooge, a A. Sylvestre, b A. Alastuey, a C. Reche, a A. Ripoll, a E. Marco, a J. O. Grimalt a and X. Querol a Received 18th November 2015, Accepted 8th December 2015 DOI: 10.1039/c5fd00182j Source contributions of organic aerosol (OA) are still not fully understood, especially in terms of quantitative distinction between secondary OA formed from anthropogenic precursors vs. that formed from natural precursors. In order to investigate the OA origin, a fi eld campaign was carried out in Barcelona in summer 2013, including two periods characterized by low and high tra c conditions. Volatile organic compound (VOC) concentrations were higher during the second period, especially aromatic hydrocarbons related to tra c emissions, which showed a marked daily cycle peaking during tra c rush hours, similarly to black carbon (BC) concentrations. Biogenic VOC (BVOC) concentrations showed only minor changes from the low to the high tra c period, and their intra-day variability was related to temperature and solar radiation cycles, although a decrease was observed for monoterpenes during the day. The organic carbon (OC) concentrations increased from the fi rst to the second period, and the fraction of non-fossil OC as determined by 14 C analysis increased from 43% to 54% of the total OC. The combination of 14 C analysis and Aerosol Chemical Speciation Monitor (ACSM) OA source apportionment showed that the fossil OC was mainly secondary (>70%) except for the last sample, when the fossil secondary OC only represented 51% of the total fossil OC. The fraction of non-fossil secondary OC increased from 37% of total secondary OC for the fi rst sample to 60% for the last sample. This enhanced formation of non-fossil secondary OA (SOA) could be attributed to the reaction of BVOC precursors with NO x emitted from road tra c (or from its nocturnal derivative nitrate that enhances night-time semi-volatile oxygenated OA (SV-OOA)), since NO 2 concentrations increased from 19 to 42 m g m ± 3 from the fi rst to the last sample. a Institute of Environmental Assessment and Water Research(IDAEA), CSIC, 08034 Barcelona, Spain. E-mail: [email protected] b Aix Marseille Universit´ e, CNRS, LCE UMR 7376, 13331 Marseille, France c Department of Chemistry and Biochemistry & Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland Electronic supplementary information (ESI) available: Sections 1 to 6, with 12 gures. See DOI: 10.1039/c5fd00182j This journal is © The Royal Society of Chemistry 2016 Faraday Discuss. , 2016, 189 , 337 359 | 337 Faraday Discussions Cite this: Faraday Discuss. , 2016, 189 , 337 PAPER Open Access Article. Published on 08 December 2015. Downloaded on 13/04/2017 21:40:01.
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  • Fall '97
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  • Volatile organic compound, ht, Dicarboxylic acid, Open Access Article, Faraday Discussions, HT period

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