New particle formation during a- and b-pinene oxidation by O3, OH and NO3, and the influence of water vapour: particle size distribution studies B. Bonn and G. K. Moorgat Max-Planck-Institute für Chemie, Atmospheric Chemistry Division, Mainz, Germany
Abstract. New particle formation during the oxidation of
(C10H16) by ozone, OH and NO3 was studied by measuring the particle size
distributions with a scanning mobility particle sizer (TSI 3936). The results indicate a drastically higher nucleation potential of
the ozonolysis than in the reaction with either OH or NO3. On the contrary, the contribution of the individual
oxidation reactions to form new aerosol volume was found to depend on the location of the carbon double bond to be oxidised: for the
endocyclic a-pinene reactions the ozonolysis
contributed mostly to the aerosol volume yield, whereas for the exocyclic
b-pinene reactions the oxidation
by O3, OH and NO3 yielded a similar aerosol volume.
In a second part of this study the influence of water vapour on the nucleation in all three possible oxidation routes was
examined. The observations revealed only an effect of water vapour during the ozonolysis reactions.
Citation: Bonn, B. and Moorgat, G. K.: New particle formation during a- and b-pinene oxidation by O3, OH and NO3, and the influence of water vapour: particle size distribution studies, Atmos. Chem. Phys., 2, 183-196, doi:10.5194/acp-2-183-2002, 2002.