Detailed chemical characterization of unresolved complex mixtures in atmospheric organics: Insights into emission sources, atmospheric processing, and secondary organic aerosol formation

2013 ◽  
Vol 118 (12) ◽  
pp. 6783-6796 ◽  
Author(s):  
Arthur W. H. Chan ◽  
Gabriel Isaacman ◽  
Kevin R. Wilson ◽  
David R. Worton ◽  
Christopher R. Ruehl ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Chemical Characterization ◽  
Organic Aerosol ◽  
Complex Mixtures ◽  
Emission Sources ◽  
Aerosol Formation ◽  
Atmospheric Processing ◽  
Secondary Organic Aerosol Formation ◽  
Detailed Chemical

scholarly journals Real-time, controlled OH-initiated oxidation of biogenic secondary organic aerosol

2012 ◽  
Vol 12 (3) ◽  
pp. 8183-8224 ◽  
Author(s):  
J. G. Slowik ◽  
J. P. S. Wong ◽  
J. P. D. Abbatt
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Oh Radicals ◽  
Phase Reaction ◽  
Aerosol Formation ◽  
Organic Mass ◽  
Ambient Aerosol ◽  
Atmospheric Processing

Abstract. The chemical complexity of atmospheric organic aerosol (OA) requires novel methods for characterization of its components and description of its atmospheric processing-induced transformations. We present the first field deployment of the Toronto Photooxidation Tube (TPOT), a field-deployable flow reactor for the controlled exposure of ambient aerosol to OH radicals. The system alternates between sampling of (1) unreacted ambient aerosol, (2) aerosol subjected to a ~4 °C temperature increase, and (3) aerosol that is both heated and oxidized by OH. This allows both characterization of the aging process and classification of aerosol in terms of its volatility and reaction-based properties. Summertime measurements by an aerosol mass spectrometer coupled to the TPOT were performed in the remote forest of Western Canada, resulting in aerosol dominated by biogenic secondary organic aerosol. Volatilization resulted in an approximately 10 to 25% decrease in organic mass and resulted in a slight increase in oxygenation. OH oxidation resulted in a further organic mass decrease (additional ~25%) and yielded an aerosol with O:C values comparable to those characteristic of low volatility, highly oxygenated OA. Most OH-induced changes occurred within the equivalent of ~3 days of atmospheric processing, with further reactions generally proceeding at a greatly reduced rate. Positive matrix factorization (PMF) analysis of the TPOT data yielded five factors. One factor is related to primary biomass burning organic aerosol, while the others describe oxygenated organic aerosol (OOA) components in terms of reactivity and volatility: (1) volatile and reactive; (2) non-volatile and reactive; (3) non-volatile and reactive early-generation product; (4) non-volatile and non-reactive product. This PMF classification of aerosol components directly in terms of reactivity and volatility is enabled by the TPOT-modulated perturbation of aerosol composition, and is not otherwise accessible. The particle-phase reaction end products have mass spectra similar to the low-volatility oxygenated organic aerosol (LV-OOA) factors widely reported in the literature, providing supporting evidence for aged organic aerosol formation from OH-driven oxidation processes.

Secondary organic aerosol formation from untreated exhaust of gasoline four-stroke motorcycles

Urban Climate ◽  
2021 ◽  
Vol 36 ◽  
pp. 100778
Author(s):  
Sepideh Esmaeilirad ◽  
Ari Setyan ◽  
Jing Wang ◽  
Vahid Hosseini
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation

scholarly journals Secondary organic aerosol formation from isoprene photooxidation under high-NOxconditions

2005 ◽  
Vol 32 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jesse H. Kroll ◽  
Nga L. Ng ◽  
Shane M. Murphy ◽  
Richard C. Flagan ◽  
John H. Seinfeld
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation
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