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List of Abstracts 226which results in different ozone distributions. Detailed results will be presented.Observations 4.5 ID:4543 09:45Decadal trends in tropospheric ozone over East Asian Pacific rim during 1998-2007: Comparison toEuropean and North American records, and implications for emerging Asian emissions impactsHiroshi Tanimoto 1 , Toshimasa Ohara 1 , Itsushi Uno 21 National Institute for Environmental Studies2 Kyushu UniversityContact: tanimoto@nies.go.jpWe examine springtime ozone trends at nine remote locations in East Asian Pacific rim during the lastdecade (1998-2007). The observed decadal ozone trends are relatively small at surface sites but aresubstantially larger at a mountainous site. The level and increasing rate of ozone at the mountainous site areboth higher than those observed at background sites in Europe and North America. We use a regionalchemistry-transport model to explore the observed changes and how changes in Asian anthropogenicemissions have contributed to the observed increasing trends. The model with yearly-dependent regionalemissions successfully reproduces the levels, variability, and interannual variations of ozone at all thesurface sites. It predicts increasing trends at the mountainous site, suggesting that increasing Asiananthropogenic emissions account for about half the observed increase. However, the discrepancy betweenthe observation and model results after 2003 (the time of largest emission increase) suggests significantunderestimation of the actual growth of the Asian anthropogenic emissions and/or incompleteness in themodeling of pollution export from continental Asia. These findings imply that improving emissionsinventory and transport scheme is needed to better understand rapidly evolving tropospheric ozone in EastAsia and its potential climatic and environmental impacts.Observations 4.6 ID:4287 10:00Aerosol characterization in the Amazon Basin during AMAZE-08: Fine particle composition andsource apportionmentQi Chen 1 , Delphine Farmer 2 , Johannes Schneider 3 , Sören Zorn 3 , Colette Heald 4 , Thomas Karl 5 , CoeHuge 6 , Stephan Borrmann 3 , Meinrat Andreae 3 , Paulo Artaxo 7 , Jose Jimenez 2 , Scot Martin 11 School of Engineering and Applied Sciences, Harvard University, USA2 University of Colorado, Boulder, USA3 Max Planck Institute for Chemistry, Mainz, Germany4 Colorado State University, Fort Collins, USA5 National Center for Atmospheric Research, Boulder, USA6 University of Manchester, UK7 University of São Paulo, BrazilContact: qichen@fas.harvard.eduAs one of the major global sources of biogenic natural aerosol particles, the Amazon Basin plays animportant role on the links between biological processes and climate. The sources, transformations, andproperties of Amazonian aerosol particles are currently not well understood or quantified. In Feb to Mar2008, as a part of the AMAZE-08 field campaign, submicron Amazonian particles were analyzed for the firsttime using an Aerodyne High-resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS). Massconcentrations, diel cycles, and size distributions of inorganic and organic species as well as the organicelemental composition were obtained. Results were compared with GEOS-Chem model predictions. Massspectral characterization, including positive matrix factorization analysis, was used to test for and show theiCACGP-IGAC 2010 15 July, 2010