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List of Abstracts 78aerosols not only play a role in regional and global radiation balance but can also modify the thermodynamicnature of the atmosphere.P-Chemistry Climate.38 ID:4197 15:35Bushfires and air quality under climate changeMelita Keywood, Mick MeyerCSIRO Marine and Atmospheric ResearchContact: melita.keywood@csiro.auUnder a changing climate the frequency of bushfires, the duration of the bushfire season and the severity ofbushfires are expected to change. Current projections for Southeastern Australia suggest there could be anincrease in the frequency of very high and extreme fire days (Hennessey et al., 2007). Annually, biomassburning results in the emission of quantities of trace gases and aerosol to the atmosphere. Biomass burningaerosols influence the radiative balance of the earth-atmosphere system directly through the scattering andabsorption of radiation, and indirectly through their influence on cloud microphysical processes, andtherefore constitute an important forcing in climate models. They also reduce visibility, influenceatmospheric photochemistry and can have a significant effect on human health. Australia experiencesbushfires on an annual basis. In most years fires are restricted to the tropical savannah forests of northernAustralia, however, there have been many bushfires in southern Australia's history. During December 2006 –February 2007, the State of Victoria in Australia was ravaged by 690 separate bushfires that devastated1,116,408 Ha of native vegetation over 69 days. On several occasions, thick smoke haze was transported toMelbourne. During this period, detailed atmospheric chemical composition measurements were carried outat an air quality station in Melbourne. This presentation will discuss the likely effects of increased bushfirefrequency and severity suggested in climate projections on urban air quality using the observations made atthe air quality station as a basis for the discussion.Hennessey et al. 2007: Australia and New Zealand. Climate Change 2007: Impacts, Adaptation andVulnerability. Contribution of Working Group II to the Fourth Assessment Report of the IntergovernmentalPanel on Climate Change, M.L. Parry, O.F. Canziani, J.P. Palutikof, P.J. van der Linden and C.E. Hanson,Eds., Cambridge University Press, Cambridge, UK, 507-540P-Chemistry Climate.39 ID:4258 15:35Impacts of intense Siberian forest fire aerosols on meteorology over East Asia in May 2003Rokjin Park 1 , Daeok Youn 1 , Byung-Kwon Moon 2 , Sang-Wook Yeh 3 , Young Ho Kim 4 , Jung-Hun Woo 5 ,Eul Gyu Im 3 , Chang-Keun Song 61 Seoul National University2 Chonbuk National University3 Hanyang University4 Korea Ocean Research & Development Institute5 Konkuk University6 National Institute of Environmental ResearchContact: rjpark@snu.ac.krIntense forest fires occurred over Siberia in May 2003 and released high concentrations of biomass burningaerosols into the atmosphere, affecting regional air quality in East Asia. The high fire aerosols loads in EastAsia may subsequently affect regional climate through their solar radiation extinction. In this study, weexamine the effects of Siberian fire aerosols on regional meteorology using the National Centers forEnvironmental Prediction-Department of the Energy (NCEP-DOE) reanalysis II data and the NCARiCACGP-IGAC 2010 12 July, 2010