Title: Application and intercomparison of the RADM2 and RACM chemistry mechanism including a new isoprene degradation scheme within the regional meteorology-chemistry-model MCCM

Authors: Edwin Haas, Renate Forkel, Peter Suppan

Addresses: Institute for Meteorology and Climate Research, Atmospheric Environmental Research Division (IMK-IFU), Karlsruher Institut fur Technologie (KIT), Kreuzeckbahnstr 19, 82467 Garmisch-Partenkirchen, Germany. ' Institute for Meteorology and Climate Research, Atmospheric Environmental Research Division (IMK-IFU), Karlsruher Institut fur Technologie (KIT), Kreuzeckbahnstr 19, 82467 Garmisch-Partenkirchen, Germany. ' Institute for Meteorology and Climate Research, Atmospheric Environmental Research Division (IMK-IFU), Karlsruher Institut fur Technologie (KIT), Kreuzeckbahnstr 19, 82467 Garmisch-Partenkirchen, Germany

Abstract: The huge number of species and reactions involved in the degradation of organic compounds does not permit explicit treatment in regional models, the use of condensed mechanisms is necessary. With increased knowledge about biogenic VOC chemistry, updates of the organic chemistry have become necessary. Geiger et al. (2003) introduced a RACM mechanism with improved isoprene and biogenic VOC chemistry. To understand the mechanisms, case studies were performed: A box-model-intercomparison and MCCM (Grell et al., 2000) cross-validations. Focusing on ozone, differences were rather small. In the regional applications, RADM2 produced the highest daily ozone concentrations. Intercomparisons with measurements result in good correlation.

Keywords: box model intercomparison; gas phase chemistry mechanisms; RADM2; RACM; regional models; MM5; MCCM; MM5chem; air quality modelling; air pollution; organic chemistry; biogenic VOC chemistry; volatile organic compounds; ozone concentrations; meteorology chemistry dispersion model; dispersion modelling; pollutant dispersion.

DOI: 10.1504/IJEP.2010.030889

International Journal of Environment and Pollution, 2010 Vol.40 No.1/2/3, pp.136 - 148

Available online: 11 Jan 2010 *

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