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List of Abstracts 835 IMK, Karlsruhe Institute for Technology, Karlsruhe, GermanyContact: carl.brenninkmeijer@mpic.deThe influence from explosive volcanic eruptions on the concentrations of sulfurous and carbonaceousaerosol in the lowermost stratosphere are presented. Following the eruptions of Kasatochi in August 2008(Martinsson et al., 2009), Redoubt (March-April 2009) and Sarychev (June 2009), in situ measurementswere undertaken from the CARIBIC platform (Civil Aircraft for Regular Investigation of the atmosphereBased on an Instrument Container) (Brenninkmeijer et al., 2007). Aerosol particles were collected byimpaction technique (Nguyen et al., 2006) for subsequent analysis by accelerator-based techniques (Nguyenand Martinsson, 2007) for concentrations of a large number of elements including carbon and sulfur.CARIBIC measurements also include particle size distributions and a large number of trace gases.Measurements show a large influence on the aerosol concentration in the lowermost stratosphere, more thana factor of 3 increase persisted 3 – 4 months after the Kasatochi eruption. Similar and even strongerinfluence was observed from the Sarychev eruption during the fall of 2009. The composition of volcanicaerosol varies with time after the eruption. The ratio in concentration between carbon and sulfur was 2.6 oneweek after the Kasatochi eruption. Three to four months later that ratio was 1.2.P-Chemistry Climate.48 ID:3401 15:35Projection of the Ozone Quasi-Biennial Oscillation in the Tropical Stratosphere up to Year 2100 asSimulated with the Chemistry-Climate Model of Meteorological Research InstituteKiyotaka Shibata, Makoto DeushiMeteorological Research InstituteContact: kshibata@mri-jma.go.jpSimulations on the past and future middle atmosphere were made with the chemistry-climate model (CCM)of Meteorological Research Institute (MRI), MRI-CCM. Three runs with slightly different initial conditionswere performed for 140 years from 1960 to 2100. The dynamics module of MRI-CCM is a spectral globalmodel of T42 truncation with 68 layers extending from the surface to 0.01 hPa (about 80 km), wherein thevertical spacing is 500m in the stratosphere between 100 hPa and 10 hPa. Hines gravity wave (GW) drag isincorporated with an enhanced GW source in the tropics to spontaneously reproduce the quasi-biennialoscillation (QBO) in zonal wind. The chemistry-transport module treats 36 long-lived species including 7families, and 15 short-lived species with 80 gas phase reactions, 35 photochemical reactions and 9heterogeneous reactions. The transport for chemical species is performed with a hybrid semi-Lagrangianscheme, which is formulated to be compatible with the continuity equation. MRI-CCM is integrated withobserved forcings of SSTs, sea ice, volcanic aerosols, 11-year solar cycle, greenhouse gases, and halogens,the latter two of which are specified at the surface. It is found that the QBO amplitude in zonal wind in thetropical stratosphere is decreased in future under the global warming due to the greenhouse gas increase andthat the ozone QBO is also weakened in the higher chemistry-dominant region above 28 km as well as in thelower transport-dominant region below that level.P-Chemistry Climate.49 ID:4530 15:35Influence of stratospheric ozone depletion on tropospheric ozoneDavid Plummer, Cathy Reader, John ScinoccaEnvironment CanadaContact: David.Plummer@ec.gc.caThe chemistry-climate model CMAM (Canadian Middle Atmosphere Model) has been extensively used toiCACGP-IGAC 2010 12 July, 2010