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Oceanic processes such as coastal upwelling and mesoscale eddy, could influence the spatial distribution and environmental behaviors of semi-volatile organic pollutants in the marine environment. Seawater samples were collected from the full-depth water columns from the South China Sea (SCS), and PAH concentrations (∑14PAH) in the continental shelf and the open basin areas were 16-110 and 10-93 ng/L respectively. Results of isomeric ratios and principal component analysis illustrated PAHs' mixed sources (petrogenic and pyrogenic). PAH in