Berlin 2005 – scientific programme

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UP: Umweltphysik

UP 6: Poster: Aerosole

UP 6.7: Poster

Tuesday, March 8, 2005, 10:15–12:15, Poster TU HTF

New particle formation in the coastal boundary layer — •Susanne Marquart and Roland von Glasow — Institut für Umweltphysik, Universität Heidelberg

During low tide, several alkyl iodines can be released by marine algae. Some of these organoiodine compounds photolyse quickly, forming I radicals which can be chemically transformed into various inorganic iodine-species. There is some evidence that iodine oxides may play a substantial role in the formation of new particles in the marine coastal environment. To investigate this further, we present some sensitivity model studies. We used the one-dimensional model MISTRA-MPIC, which includes detailed aerosol microphysics and chemistry in the gas and aqueous phase. This model has already been used for investigating the role of halogens for the chemistry of the marine boundary layer. Besides chlorine and bromine chemistry, the model contains a detailed iodine reaction scheme and is extended by a nucleation parameterisation which connects the "real" nucleation rate of thermodynamically stable clusters with an "apparent" nucleation rate in the model’s lowest size bin. The results of our sensitivity studies are compared to available observations.