Oceanic Sink and Biogeochemical Controls on the Accumulation of Polychlorinated Dibenzo-p-dioxins, Dibenzofurans, and Biphenyls in Plankton.
Authors
Morales, L.; Dachs, J. (Jordi); Fernández-Pinós, Maria Carmen; Berrojalbiz, N.; Mompeán-de-la-Rosa, M.C. (María del Carmen); González-Gaya, B. (Belén); Jiménez, B.; Bode, A. (Antonio); Ábalos, M. (Manuela); Abad, E. (Esther)Date
2015-06-26Type
research articleKeywords
PCBpollution
ocean
global
plankton
Abstract
Polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs), and dioxin-like polychlorinated biphenyls (dl-PCBs) were measured in plankton samples from the Atlantic, Pacific and Indian Oceans collected during the Malaspina circumnavigation cruise. The concentrations of PCDD/Fs and dl-PCBs in plankton averaged 14 and 240 pg gdw-1, respectively, but concentrations were highly variable. The global distribution of PCDD/Fs and dl-PCBs was not driven by proximity to primary sources in continents, but significantly correlated with plankton biomass. These trends are consistent with the interactions between atmospheric deposition, biomass dilution, and settling fluxes of organic matter in the water column, as key processes driving the POPs plankton phase concentrations in the global oceans. The application of a model of the air-water-plankton diffusive exchange of PCDD/Fs and PCBs reproduce in part the influence of biomass on plankton phase concentrations, and suggest future modelling prioritiesThe ...
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