Secondary organic aerosol origin in an urban environment: influence of biogenic and fuel combustion precursors

Minguillón, M. C.; Pérez, N.; Marchand, N.; Bertrand, A.; Temime-Roussel, B.; Agrios, Konstantinos; Szidat, Sönke; van Drooge, B.; Sylvestre, A.; Alastuey, A.; Reche, C.; Ripoll, A.; Marco, E.; Grimalt, J. O.; Querol, X. (2016). Secondary organic aerosol origin in an urban environment: influence of biogenic and fuel combustion precursors. Faraday Discussions, 189, pp. 337-359. Royal Society of Chemistry 10.1039/C5FD00182J

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Source contributions of organic aerosol (OA) are still not fully understood, especially in terms of quantitative distinction between secondary OA formed fromanthropogenic precursors vs. that formed from natural precursors. In order to investigate the OA origin, a field campaign was carried out in Barcelona in summer 2013, including two periods characterized by low and high traffic conditions. Volatile organic compound (VOC) concentrations were higher during the second period, especially aromatic hydrocarbons related to traffic emissions, which showed a marked daily cycle peaking during traffic rush hours, similarly to black carbon (BC) concentrations. Biogenic VOC (BVOC) concentrations showed only minor changes from the low to the high traffic 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 first to the second period, and the fraction of non-fossil OC as determined by 14C analysis increased from 43% to 54% of the total OC. The combination of 14C 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 first 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 NOx emitted from road traffic (or from its nocturnal derivative nitrate that enhances night-time semi-volatile oxygenated OA (SV-OOA)), since NO2 concentrations increased from 19 to 42 mg m-3 from the first to the last sample.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Agrios, Konstantinos and Szidat, Sönke

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1364-5498

Publisher:

Royal Society of Chemistry

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

16 Aug 2016 12:55

Last Modified:

08 Sep 2017 13:40

Publisher DOI:

10.1039/C5FD00182J

BORIS DOI:

10.7892/boris.85893

URI:

https://boris.unibe.ch/id/eprint/85893

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