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    • Dpto. Ingeniería Química y Tecnología del Medio Ambiente
    • DEP48 - Artículos de revista
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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/65154

    Título
    Factors affecting the atmospheric occurrence and deposition of polychlorinated biphenyls in the Southern Ocean
    Autor
    Galbán Malagón, Cristóbal
    Del Vento, Sabino
    Cabrerizo Pastor, Ana
    Dachs, Jordi
    Año del Documento
    2013
    Descripción
    Producción Científica
    Documento Fuente
    Atmospheric Chemistry and Physics. December 2013 Volume 13, Issue 23, Pages 12029 - 1204112
    Abstract
    Persistent organic pollutants, such as polychlorinated biphenyls, reach the Southern Ocean atmosphere through long-range atmospheric transport. In this study we report the largest dataset available for the atmospheric occurrence of PCBs in the Southern Ocean surrounding the Antarctic Peninsula from samples obtained during three cruises in 2005, 2008 and 2009. The gas phase concentrations of total PCBs (Sigma;25PCBs) ranged from 1 to 70 pg m-3, while the aerosol phase concentrations were significantly lower (0.04 to 0.4 pg m-3). The aerosol phase is enriched in the more hydrophobic congeners consistent with the model predictions of gas-particle partitioning. There is a net air-to-water diffusive flux of PCBs to the Southern Ocean, up to 100 times higher than the dry deposition flux of aerosol-bound PCBs. The air-water disequilibrium is higher for the more hydrophobic congeners consistent with the role of the biological pump removing PCBs from the water column by settling of PCBs bound to organic matter. The atmospheric half-lives of PCB 52 and 180 are of 3.8 and 1 days, respectively, as calculated from the measured atmospheric concentration and depositional fluxes. The volatilization of PCBs from Antarctic soils during the austral summer drives higher gas phase concentrations in the atmosphere over Antarctica during the warmer periods. This temperature dependence is not observed for PCBs over the adjacent Southern Ocean, probably due to the importance of long-range atmospheric transport and atmospheric deposition modulating the atmospheric occurrence of PCBs.
    Revisión por pares
    SI
    DOI
    10.5194/acp-13-12029-2013
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/65154
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
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    • DEP48 - Artículos de revista [265]
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    Universidad de Valladolid

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