Browsing by Autor "Pawelko, Ezequiel Eduardo"

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    Biomass burning and volcanic ash characterization at Centro de Investigaciones en Láseres y Aplicaciones, Buenos Aires, Argentina
    (Revista Boliviana de Física, 2012) Ristori, Pablo Roberto; Otero, Lidia Ana; Pallotta, Juan Vicente; Pawelko, Ezequiel Eduardo; Quel, Eduardo Jaime
    Biomass burning events and volcanic ash transport measurements from a multi-wavelength backscatter LIDAR at Centro de Investigaciones en Láseres y Aplicaciones, CEILAP (CITEDEF-CONICET), (34.5° S, 58.5° W), Buenos Aires, Argentina are studied to characterize their optical properties. The lidar system operating at this place has the first three harmonics of a Nd:YAG laser and collects Raman returns from nitrogen and water vapor. Different aerosol layers were separated from the total acquisition and studied alone to characterize their optical properties at different wavelengths. Intended products are the backscatter coefficient and the color ratio. In addition a comparison between layers is performed, trying to determine their similarity. This method has the final goal of parameterizing the basic parameters of biomass burning originated aerosols and volcanic ashes transported over important distances.
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    The Puyehue-Cordón Caulle Volcanic Eruption, June 2011: Water Vapor, Atmospheric Boundary Layer and Aerosol Temporal Evolution in Buenos Aires, Argentina
    (Revista Boliviana de Física, 2012) Ana Otero, Lidia; Ristori, Pablo Roberto; Pallotta, Juan Vicente; Pawelko, Ezequiel Eduardo; Quel, Eduardo Jaime
    The 4th June 2011 a volcano eruption in the Puyehue - Cordón Caulle chain in the south central region of Chile released an important amount of ash to the atmosphere. The cloud reached Argentina, Uruguay, Brazil, South Africa and Australia blocking the aerial transport. A multiwavelength backscatter Raman LIDAR, developed and operational in Buenos Aires, at Centro de Investigaciones en Láseres y Aplicaciones, CEILAP (CITEDEF-CONICET), (34.5° S, 58.5° W) observed this event as well as satellites and ground-based systems of this monitoring station. The source of this lidar is a tripled Nd:YAG laser, collecting the nitrogen Raman backscattered returns from nitrogen at visible and ultraviolet wavelengths to retrieve the aerosol extinction and Angstróm coefficient vertical distribution. It also measures the water vapor mixing ratio profile at the corresponding Raman­shifted backscattered return. Additional information such as satellite imaging, backtrayectories (HYSPLIT model) and aerosol optical depth (AERONET) were included on this study.