Effect of hydrophobic primary organic aerosols on secondary organic aerosol formation from ozonolysis of α-pinene

Details Effect of hydrophobic primary organic aerosols on secondary organic aerosol formation from ozonolysis of α-pinene Effect of hydrophobic primary organic aerosols on secondary organic aerosol formation from ozonolysis of α-pinene

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420803s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 20, CiteID L20803

Other

30

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Biogeosciences: Biogeochemical Kinetics And Reaction Modeling (0414, 0793, 1615, 4805, 4912)

Scientific paper

Semi-empirical secondary organic aerosol (SOA) models typically assume a well-mixed organic aerosol phase even in the presence of hydrophobic primary organic aerosols (POA). This assumption significantly enhances the modeled SOA yields as additional organic mass is made available to absorb greater amounts of oxidized secondary organic gases than otherwise. We investigate the applicability of this critical assumption by measuring SOA yields from ozonolysis of α-pinene (a major biogenic SOA precursor) in a smog chamber in the absence and in the presence of dioctyl phthalate (DOP) and lubricating oil seed aerosol. These particles serve as surrogates for urban hydrophobic POA. The results show that these POA did not enhance the SOA yields. If these results are found to apply to other biogenic SOA precursors, then the semi-empirical models used in many global models would predict significantly less biogenic SOA mass and display reduced sensitivity to anthropogenic POA emissions than previously thought.

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