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General Session 4: Marine environment, ecosystem & sustainability |
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Fate and transfer flux of polycyclic aromatic hydrocarbons in seawater from the North Pacific to the Arctic: Insights from field measurements and multimedia model simulation
GS4-06-S
Mian Chen* , State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, PR China
Presenter Email: 1179335686@qq.com
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| Persistent organic pollutants have accumulated ubiquitously in the Arctic environments, but their fate under climate change and rapid sea-ice retreat in the Arctic is controversial. Seven polycyclic aromatic hydrocarbons (PAHs), as the representative substances, in surface and deep seawater were studied from the temperate Pacific Ocean to the Arctic Ocean, along the cruise track of the 4th Chinese National Arctic Research Expedition in the summer of 2010. Concentrations of dissolved ¦²7PAH in surface water ranged from 1.0 to 5.1 ng L-1, with a mean of 2.0¡À0.7 ng L-1, decreasing with increasing latitude. The vertical profiles of dissolved ¦²7PAH were generally characteristic of surface enrichment and depth depletion, which approximately the same goes for chlorophyll. PAHs isomer pair ratios indicated that PAHs primarily descended from the mixed sources of grass, wood and coal or petroleum combustion.
Furthermore, PAHs distributions and fluxes in/between air and water in the Bering Sea were simulated using a level III fugacity model. Results suggested a summer air-to-sea flux of PAHs in the Bering Sea, indicating that the ocean serves as a sink for PAHs. The deposition and volatilization of Acpy and Acp almost reached equilibrium, and any climate change or perturbation could lead to disequilibrium. The hypothesis is that if the temperature in the Arctic keeps rising up, the study area may become a new source for low molecular weight PAHs. |
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