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List of Abstracts 194southeast Pacific out of Arica, Chile during the VAMOS Ocean-Cloud-Atmosphere-Land Study RegionalExperiment (VOCALS-REx) in October/November 2008, and over the central Pacific aboard the R/VKa’imimoana during August and September 2009. All experiments used a High Resolution – Particle Timeof Flight Aerosol Mass Spectrometer (HR-ToF-AMS) along with other aerosol measurements. DuringVOCALS the lowest median concentrations of chemical species such as aerosol sulfate (0.13 µg m -3 ),organics (0.06 µg m -3 ), and black carbon mass (4.9 ng m -3 ), as well as gas-phase CO (60 ppb), wereencountered in the marine boundary layer along 20°S and west of 78°E. We believe these low values can beattributed, at least in part, to collection taking place 1) in the southern hemisphere, where there is lesspopulation and landmass, 2) over a remote area of the ocean, far removed from continental influence, and 3)over the oligotrophic ocean, therefore less primary and secondary organic aerosol. Using Black Carbon andCO to establish background conditions, the data from the three campaigns are shown and will be discussedin terms of describing the meteorology and aerosol chemistry that constitute these background conditions.P-Observations 2.57 ID:4519 10:30Characterization of water soluble ionic and carbonaceous aerosol over Bay of Bengal during ICARB-WM. Saxena 1 , T. Saud 1 , A.K. Singh 2 , S.K. Sharma 1 , R. Gautam 1 , S. Singh 1 , T.K. Mandal 11 National Physical Laboratory (CSIR), New Delhi, India2 Bose Institute, Darjeeling, IndiaContact: mohitnpl@gmail.comTo characterize the physico-chemical properties and radiative effects of atmospheric aerosols and trace gasesover Bay of Bengal, an extensive experiment “Integrated Campaign for Aerosols, Gases and RadiativeBudget “(ICARB) was carried out under the Geosphere Biosphere Program of the Indian Space ResearchOrganization (ISRO-GBP) during winter season 2009. In the present study, concentration of water solubleions such as NH4+, SO4--, NO3-, Cl-, F-, Na+, K+, Ca2+ and Mg2+ were estimated. The averageconcentration of NH4+, SO4--, and NO3- over BOB found to be 1.96, 8.68, 1.92, µg/m3 respectively. Thepercentage of non sea-salt fraction (nss) and sea salt fraction (ssf) was estimated to understand thecontribution of major ions other than the marine sources. Dominance of non sea salt SO4-- was observedover this region. Concentration of SO4-- was found to be positively correlated with NH4+ (r2=.676)similarly concentration of NH4+ found to be positively correlated with NO3- (r2=.867) which may indicatethe presence of ammonium sulfate and ammonium nitrate as major water soluble particle. Higherconcentration of organic carbon (OC) is found in the Indian costal area which ranges from 10 -16 µg/m3,this may be due to strong influence from the Indian continental air masses. In the mid of Bay of Bengalconcentration of OC ranges from 4-6 µg/m3 whereas ambient concentration of OC over eastern part of BOBranges from 4-12 µg/m3. Similarly, the trend of Elemental carbon was found same like OC but with lowervalues.P-Observations 2.58 ID:4532 10:30A study of optical properties of Amazon Basin aerosols using remote sensing and in situ measurementsElisa Thomé Sena, Paulo Artaxo, Alexandre Lima CorreiaUniversidade de São PauloContact: elisats@if.usp.brThe Amazon tropical rainforest constitutes a unique and complex ecosystem, and an important source ofaerosol particles for the global atmosphere for both dry and wet season. Remote sensing techniques areextremely useful because of the high spatial coverage and recent instruments are dedicated to the study ofiCACGP-IGAC 2010 14 July, 2010