Persistent organic contaminants, which are bioaccumulative and
toxic are a concern for the ecosystems and human health and are
regulated under international law (global and regional conventions,
besides other). If semivolatile, they cycle in different
environmental compartments and follow complex transport pathways.
The ocean is believed to play a key role in the cycling by
accumulating and storing the contaminant and providing a transport
medium. But substance fate in the marine environment is not fully
understood yet. Here, the global multicompartment
chemistry-transport model MPI-MCTM is used to study the fate of
organic pollutants in the marine and total environment. For the
first time historical emission data are used in spatially-resolved
long-term simulations of an insecticide, DDT, and an industrial
chemical, perfluorooctanoic acid (PFOA). The model results give new
insights into the cycling of these substances as different spatial
and process resolutions were tested. E.g. for DDT the model results
show saturation and reversal of air-sea exchange, which was not
indicated by any other study before.
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