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Título

Diurnal Variability of Persistent Organic Pollutants in the Atmosphere over the Remote Southern Atlantic Ocean

AutorGioia, Rosalinda; MacLeod, Matthew; Castro-Jiménez, Javier; Nizzeto, Luca; Dachs, Jordi; Lohmann, Rainer; Jones, Kevin C.
Palabras clavepersistent organic pollutants (POPs)
diurnal cycle
polychlorinated biphenyls (PCBs)
polycyclic aromatic hydrocarbons (PAHs)
South Atlantic
Fecha de publicación22-ago-2014
EditorMultidisciplinary Digital Publishing Institute
CitaciónAtmosphere 5(3): 622-634 (2014)
ResumenA diel (24-h) cycle with daytime atmospheric concentrations higher than nighttime concentrations by a factor of 1.5–3 was observed for several low molecular weight polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) in remote areas of the tropical South Atlantic during a cruise in October–November 2005. In contrast, high molecular weight PCBs and PAHs did not display diurnal variability. A model which has successfully explained diel variability of persistent organic pollutants (POPs) over land could not reproduce the observed diel cycle by considering variability in temperature, atmospheric OH radical concentrations, atmospheric boundary layer height and wind speed as causal factors. We used the model to conduct two bounding scenarios to explore the possibility that phytoplankton biomass turn-over in the surface ocean drives the observed variability in air concentrations. The model could only qualitatively reproduce the field observations of diel variability for low chlorinated PCB congeners when the ocean acts as a source of pollutants to the atmosphere, and when variability in biomass drives variability in the capacity of the surface ocean.
Versión del editorhttp://dx.doi.org/10.3390/atmos5030622
URIhttp://hdl.handle.net/10261/130926
DOI10.3390/atmos5030622
ISSN2073-4433
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