Polybrominated diphenyl ethers(PBDEs)pose significant threats to the growth of marine organisms and even human health.However,the migration,transformation,and regulatory mechanisms of PBDEs remain unclear in China's coastal waters.This study utilizes a numerical model to quantitatively analyze the seasonal migration and transformation of polybrominated diphenyl ethers 153(BDE-153)in Jiaozhou bay.The simulation results revealed that BDE-153 concentration exhibited apparent seasonal variation with a peak in summer,with the highest concentrations for dissolved and total particulate BDE-153 reaching 0.22 μg/m3 and 2.3 μg/m3,respectively.Transformation rates of BDE-153 during phytoplankton absorption,mortality,and debris mineralization were also significantly higher in summer than in other seasons.Both concentration of BDE-153 and its transformation rates during biotic processes showed a belt-shaped decrease from north to south with the highest values near the DaGu river in the northwest and the MoShui river in the northeast.Rivers were the key source of BDE-153,with an input flux of 10.5 kg/a,significantly higher than the supply rate from air-sea exchange.Convective exchange with the open sea was the primary sink with output rates of 1.1 kg/a and 8.0 kg/a for dissolved and total suspended particulate forms,respectively.
hexabromobiphenyl etherseasonal variationmigration and transformationnumerical simulationJiaozhou bay
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