Particle formation and growth from ozonolysis of α-pinene

Published

Journal Article

Observations of particle nucleation and growth during ozonolysis of α-pinene were carried out in Calspan's 600 m3 environmental chamber utilizing relatively low concentrations of α-pinene (15 ppb) and ozone (100 ppb). Model simulations with a comprehensive sectional aerosol model which incorporated the relevant gas-phase chemistry show that the observed evolution of the size distribution could be simulated within the accuracy of the experiment by assuming only one condensable product produced with a molar yield of 5% to 6% and a saturation vapor pressure (SVP) of about 0.01 ppb or less. While only one component was required to simulate the data, more than one product may have been involved, in which case the one component must be viewed as a surrogate having an effective SVP of 0.01 ppb or less. Adding trace amounts of SO2 greatly increased the nucleation rate while having negligible effect on the overall aerosol yield. We are unable to explain the observed nucleation in the α-pinene/ozone system in terms of classical nucleation theory. The nucleation rate and, more importantly, the slope of the nucleation rate versus the vapor pressure of the nucleating species would suggest that the nucleation rate in the α-pinene/ozone system may be limited by the initial nucleation steps (i.e., dimer, trimer, or adduct formation). Copyright 2001 by the American Geophysical Union.

Full Text

Duke Authors

Cited Authors

  • Hoppel, W; Fitzgerald, J; Frick, G; Caffrey, P; Pasternack, L; Hegg, D; Gao, S; Leaitch, R; Shantz, N; Cantrell, C; Albrechcinski, T; Ambrusko, J; Sullivan, W

Published Date

  • November 16, 2001

Published In

Volume / Issue

  • 106 / D21

Start / End Page

  • 27603 - 27618

International Standard Serial Number (ISSN)

  • 0148-0227

Digital Object Identifier (DOI)

  • 10.1029/2001JD900018

Citation Source

  • Scopus