Investigating SOA from alpha-pinene ozonolysis with the GECKO modeling tool.

Tuesday, 16 December 2014
Julia M Lee-Taylor1, Sasha Madronich1, Bernard Aumont2, Michael J Lawler3, James N Smith1 and Marie Camredon2, (1)Natl Ctr Atmospheric Research, Boulder, CO, United States, (2)University Paris-Est Créteil Val de Marne, Créteil Cedex, France, (3)University of Eastern Finland, Department of Applied Physics, Kuopio, Finland
Atmospheric oxidation of terpenes leads to a rich variety of functionalized organic molecules of vapor pressures low enough to permit their condensation on particles. GECKO-A is an explicit chemical model useful for investigating fine details of tropospheric oxidation chemistry. The TDCIMS measurement technique allows the identification of specific molecular formulae in aerosol particles. We have incorporated recent advances in alpha-pinene chemistry into the model and apply it to study alpha-pinene ozonolysis and its subsequent condensable products. We assess the degree to which particle size affects modeled aerosol chemical composition and structure from alpha-pinene ozonolysis and compare the statistical composition of the modeled aerosol to that observed by TDCIMS in chamber studies.