Exchange between the gas and particle phase is a constitutive element of the dynamic system that is atmospheric organic aerosols. In both phases organic compounds can undergo oxidation reactions that change their vapor pressure and thus partitioning behavior. Organic compounds can be of both biogenic and anthropogenic origin. Emissions from the biosphere couple tree emissions to cloud formation and climate via secondary particle formation; anthropogenic emissions are important players in air pollution.
Therefore, to understand organic aerosol components, their fate in the atmosphere, and ultimately air quality and climate effects, techniques are required to quantitatively probe the same molecules in the gas- and particulate phase.
In this session we want get an overview of state-of-the-art techniques to measure partitioning, direct atmospheric observations of partitioning, as well as of concepts to implement partitioning in models.