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

[1] 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 a-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 semiempirical models used in many global models would predict significantly less biogenic SOA mass and display reduced sensitivity to anthropogenic POA emissions than previously thought. Citation: Song, C., R. A. Zaveri, M. L. Alexander, J. A. Thornton, S. Madronich, J. V. Ortega, A. Zelenyuk, X.-Y. Yu, A. Laskin, and D. A. Maughan (2007), Effect of hydrophobic primary organic aerosols on secondary organic aerosol formation from ozonolysis of a-pinene, Geophys. Res. Lett., 34, L20803,

[1]  James M. Roberts,et al.  Budget of organic carbon in a polluted atmosphere: Results from the New England Air Quality Study in 2002 , 2005 .

[2]  Barry J. Huebert,et al.  A large organic aerosol source in the free troposphere missing from current models , 2005 .

[3]  R C Flagan,et al.  State-of-the-art chamber facility for studying atmospheric aerosol chemistry. , 2001, Environmental science & technology.

[4]  J. Seinfeld,et al.  Global distribution and climate forcing of carbonaceous aerosols , 2002 .

[5]  J. Pankow.  An absorption model of GAS/Particle partitioning of organic compounds in the atmosphere , 1994 .

[6]  John H Seinfeld,et al.  Reactions of semivolatile organics and their effects on secondary organic aerosol formation. , 2007, Environmental science & technology.

[7]  Donald Dabdub,et al.  Development and initial evaluation of a dynamic species-resolved model for gas phase chemistry and size-resolved gas/particle partitioning associated with secondary organic aerosol formation , 2005 .

[8]  I. J. Ackermann,et al.  Modeling the formation of secondary organic aerosol within a comprehensive air quality model system , 2001 .

[9]  Qi Zhang,et al.  Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically‐influenced Northern Hemisphere midlatitudes , 2007 .

[10]  Erik Swietlicki,et al.  Organic aerosol and global climate modelling: a review , 2004 .

[11]  R. W. Waytulonis,et al.  Chemical analysis of diesel engine nanoparticles using a nano-DMA/thermal desorption particle beam mass spectrometer. , 2001, Environmental science & technology.

[12]  D. Hauglustaine,et al.  Change in global aerosol composition since preindustrial times , 2006 .

[13]  John H. Seinfeld,et al.  Organic aerosol formation from the oxidation of biogenic hydrocarbons , 1999 .

[14]  John H. Seinfeld,et al.  Aromatics, Reformulated Gasoline, and Atmospheric Organic Aerosol Formation , 1997 .

[15]  Qi Zhang,et al.  Deconvolution and quantification of hydrocarbon-like and oxygenated organic aerosols based on aerosol mass spectrometry. , 2005, Environmental science & technology.

[16]  P. Crutzen,et al.  Human‐activity‐enhanced formation of organic aerosols by biogenic hydrocarbon oxidation , 2000 .

[17]  John H. Seinfeld,et al.  Gas-Phase Ozone Oxidation of Monoterpenes: Gaseous and Particulate Products , 1999 .

[18]  Charles E. Kolb,et al.  Chase Studies of Particulate Emissions from in-use New York City Vehicles , 2004 .

[19]  John H. Seinfeld,et al.  Biogenic secondary organic aerosol over the United States: Comparison of climatological simulations with observations , 2007 .

[20]  Katrin Fuhrer,et al.  Field-deployable, high-resolution, time-of-flight aerosol mass spectrometer. , 2006, Analytical chemistry.

[21]  C. Seigneur,et al.  Modeling secondary organic aerosol formation via multiphase partitioning with molecular data. , 2006, Environmental science & technology.

[22]  M. Molina,et al.  Secondary organic aerosol formation from anthropogenic air pollution: Rapid and higher than expected , 2006 .

[23]  Alla Zelenyuk,et al.  From Agglomerates of Spheres to Irregularly Shaped Particles: Determination of Dynamic Shape Factors from Measurements of Mobility and Vacuum Aerodynamic Diameters , 2006 .

[24]  J. Seinfeld,et al.  Gas/Particle Partitioning and Secondary Organic Aerosol Yields , 1996 .

[25]  Stephan Borrmann,et al.  A New Time-of-Flight Aerosol Mass Spectrometer (TOF-AMS)—Instrument Description and First Field Deployment , 2005 .

[26]  Allen L Robinson,et al.  Rethinking Organic Aerosols: Semivolatile Emissions and Photochemical Aging , 2007, Science.