DEVELOPMENT OF A MATHEMATICAL MODEL FOR 3D-DYNAMICS OF PERSISTENT ORGANIC POLLUTANT IN THE EAST CHINA SEA
A three-dimensional/high-resolution transport model for persistent organic pollutants (ECS-POPs) has been developed to assess quantitatively the dynamics of POPs in the East China Sea (ECS). The ECS-POPs is coupled with an ocean circulation model and includes the POPs concentration in four types of media: air, seawater, phytoplankton, and detritus, in which air concentration is used as a boundary condition. In addition to the advection and diffusion by ocean currents and turbulences, the ECS-POPs also includes the diffusive flux of POPs through sea surface, phytoplankton uptake of POPs, vertical sinking of phytoplankton and detritus, detritus production by phytoplankton mortality, and decomposition of detritus. The phytoplankton information is from monthly satellite chlorophyll a data. In this study, we used the ECS-POPs to examine the seasonal variability of PCB153 whose air concentration was available in the literature. The model results presented a remarkable seasonal variability in the PCB153 concentration in three media. Concentrations of both dissolved and particulate PCB153 were high in winter and low in summer. In costal regions where the chlorophyll a concentrations are high, the horizontal and vertical distributions of dissolved and particulate PCB153 concentrations are strongly affected by the uptake of phytoplankton. To understand what factor mostly controls the seasonal variability in the PCB153 concentrations in the ECS, several sensitivity experiments were carried out. It was clarified that the change of water temperature is the major factor controlling the seasonal variation in the air-sea flux of POPs as well as the spatial distribution of POPs in the ECS. The model-based yearly mass balance of PCB153 in the ECS indicated that most of the atmospheric input PCB153 are removed outside the ECS by the ocean currents or accumulated to the sea bottom by vertical sinking.
Jun Ono Daisuke Takahashi Xinyu Guo Shin Takahashi Hidetaka Takeoka
Center for Marine Environmental Studies,Ehime University Hydrospheric Atmospheric Research Center,Nagoya University
国际会议
北京
英文
1-4
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）