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| - Ozonolysis of β-Pinene: Temperature Dependence of Secondary Organic Aerosol Mass Fraction
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| - Measurements of the formation of organic particulate matter during the atmospheric oxidation of one of the major biogenic hydrocarbons.
- The SOA formation from β-pinene ozonolysis at modest precursor concentrations (2−40 ppb) was investigated in the temperature range of 0−40 °C. The presence of inert seeds and high ozone concentrations is necessary to minimize losses of semivolatile vapors to the walls of the smog chamber. β-pinene secondary organic aerosol production increases significantly with decreasing temperature. An increase by a factor of 2−3, depending on the reacted β-pinene concentration, was observed as the temperature decreased from 40 to 0 °C. This increase appears to be due mainly to the shifting of partitioning of the semivolatile SOA components toward the particulate phase and not to a change of the β-pinene product distribution with temperature. The measurements are used to develop a new temperature-dependent parametrization for the four-component basis-set. The parametrization predicts much higher SOA production for β-pinene ozonolysis for typical atmospheric conditions than the values that have been suggested by previous studies.
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