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Heterogeneous chemistry on secondary organic aerosols and HULIS

Gas to particle conversion forms so called secondary aerosols. Secondary Organic Aerosols (SOA) are formed by reaction of Volatile Organic Compounds (VOCs), which are released by plants and trees. Gaseous isoprenoids like á-pinene are oxidized by atmospheric reactants like ozone or hydroxyl radicals and form particles by nucleation and aggregation. A special class of SOA are so-called Humic Like Substances (HULIS). HULIS have similar structures to humic acides which are well known from soil chemistry. While HULIS are formed by shorttime atmospheric oxidation and nucleation, humic substances are formed slower at dark conditions. SOA and HULIS play an important role in atmospheric chemistry. They are very important reactants in atmospheric trace gas reactions. Mechanisms of heterogeneous atmospheric reactions of SOA and HULIS are hardly known. Within the HALOPROC project (Natural Halogenation Processes in the Environment Atmsophere and Soil) the halogenation of SOA and HULIS by seasalt activation is topic of research. As part of the EGER project (ExchanGE processes in mountainous Regions), aiming to investigate trace gas exchange between atmosphere and ecosystems, formation of nitrous acid is investigated in laboratory experiments and measured in the atmosphere.

Completed Projects (with main focus on this field)

DFG (ZE792/4-1)EGER
Matthias Sörgel, Cornelius Zetzsch
DFG (ZE792/5-1)Natural Halogenation Processes in the Environment Atmosphere and Soil (HALOPROC)
Johannes Ofner, Natalja Balzer, Sergej Bleicher, Julian Wittmer, Cornelius Zetzsch

last modified 2009-06-03