ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-13-625-2013 Modeling the meteorological and chemical effects of secondary organic aerosols during an EUCAARI campaign Athanasopoulou E. 1 5 Vogel H. 1 Vogel B. 1 Tsimpidi A. P. 2 Pandis S. N. 3 Knote C. 4 Fountoukis C. 3 Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas (FORTH), Patras, Greece Laboratory for Air Pollution/Env. Technology, Empa Materials and Science, 8600 Duebendorf, Switzerland now at: National and Kapodistrian University of Athens, Faculty of Physics, Dept. of Environmental Physics and Meteorology, Athens, Greece 17 01 2013 13 2 625 645 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/13/625/2013/acp-13-625-2013.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/13/625/2013/acp-13-625-2013.pdf

A volatility basis set (VBS) approach for the simulation of secondary organic aerosol (SOA) formation is incorporated in the online coupled atmospheric model system COSMO-ART and applied over Europe during the EUCAARI May 2008 campaign. Organic aerosol performance is improved when compared to the default SOA module of COSMO-ART (SORGAM) against high temporal resolution aerosol mass spectrometer ground measurements. The impact of SOA on the overall radiative budget was investigated. The mean direct surface radiative cooling averaged over Europe is −1.2 W m<sup>−2</sup>, representing approximately 20% of the total effect of aerosols on the radiative budget. However, responses are not spatially correlated with the radiative forcing, due to the nonlinear interactions among changes in particle chemical composition, water content, size distribution and cloud cover. These interactions initiated~by the effect of SOA on radiation are found to result even in a positive forcing in specific areas. Further model experiments showed that the availability of nitrogen oxides slightly affects SOA production, but that the aging rate constant used in the VBS approximation and boundary concentrations assumed in the model should be carefully selected. The aging of SOA is found to reduce hourly nitrate levels by up to 30%, while the condensation of inorganic species upon pre-existing, SOA-rich particles results in a monthly average increase of 5% in sulfate and ammonium formation in the accumulation mode.

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