Information - AS3.02 Aerosol Chemistry and Microphysics (General Session)
The aim of this session is discuss new developments in the chemistry and microphysics of tropospheric aerosols and their importance for the atmosphere. This year the organic aerosol component will cover a substantial part of the session:
Secondary organic aerosols are formed by oxidation of biogenic and anthropogenic hydrocarbons with the atmospheric oxidants OH, O3 and NO3. The importance of the organic component for the climate effects and atmospheric chemistry of aerosols is indisputable, nevertheless many details are still not clear or inconclusive, e.g. the O3 vs. OH oxidation at day and night time - the role of OH scavengers in lab studies, the importance of oxidation by NO3, the long term chemical fate of organic particles in the oxidizing atmosphere or their interaction with water vapour at sub- and supersaturation.
Since a large amount of new data on secondary organic aerosols has been provided by the enthusiastic work of many groups during the last decade, and new fast and sensitive mass spectroscopic methods gained in importance, we feel that it is time for a critical synopsis of what is known and what is agreeable on secondary aerosol formation. In this sense the session will focus on
• the oxidation mechanism of the precursors
• the formation of particles
•mass balance between reacted precursors, formed condensable vapours and generated organic particulate mass.
•chemical and physical properties of SOA constituents
•new developments in multiphase processes in organic aerosols
The goal is to obtain a discussion based, actual picture of secondary organic aerosol formation which should help to direct the next steps of research.
Preliminary List of Solicited Speakers
Maria Kanakidou, University of Crete
Thorsten Hoffmann, Gutenberg-Universität, Mainz
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