Alas material parameter ioff7/9/2023 However, the marine ecosystem of the Zhejiang coastal region is under great pressure from massive pollutant inputs (e.g., excess nutrients, microplastics, and heavy metals) caused by anthropogenic activities. The coastal waters off Zhejiang Province in China, which are in the western part of the East China Sea (ECS), provide not only habitats for a diverse range of marine creatures but also vital resources for commercial fisheries, as a crucial support for local economic and social development. Our study suggests that the water quality in the Zhejiang coastal region is potentially more vulnerable to pollutants discharged off the CJE in autumn and winter than in the other seasons, due to the influence of the coastal currents. We further reveal that, winter pollution covers ∼68% larger area in the Zhejiang coastal region, with ∼40% higher peak concentration value and ∼9 day longer duration compared to autumn pollution. Approximately 79% and 94% of the released pollutants are transported into the Zhejiang coastal waters in autumn and winter, respectively, which are mainly controlled by the Zhe-Min Coastal Current. The results show significant seasonal variations in pollutant transport and dispersion, which are highly associated with river discharge variation, the East Asian monsoon, and shelf circulations. In this study, we focus on the transport processes of conservative pollutants discharged off the CJE using Eulerian tracers and Lagrangian particles coupled with a reliable 3D hydrodynamic model. However, the impacts of pollutants discharged off the Changjiang Estuary (CJE) on the coastal waters of Zhejiang Province have not been quantitatively investigated. The increasing input of terrestrial pollutants is one of the major threats to coastal marine ecosystems.
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