以多环芳烃(PAHs)为目标物，在环渤海监测大气浓度和沉降量，分析渤海大气沉降通量和源贡献的时变特征。嵌套改进ChnMETPOP和CanMETOP模型。利用ChnMETPOP进行1990-2013年的模拟，根据模拟和监测值之间误差最小优化模型参数。利用CanMETOP开展2013-2016年的模拟。基于模拟结果验证，利用4年的模拟数据评估渤海PAHs大气沉降通量的时空格局，与其理化性质和环境参数之间的响应关系，探讨主控因素。根据源排放强度和主控因素的可变性，利用蒙特卡罗法评估大气沉降通量的不确定性。利用清单分离法，结合源解析技术，识别不同源区内主要类型源排放对渤海PAHs大气沉降通量贡献比例。利用情景模拟，分析渤海PAHs大气沉降通量对主要贡献源区内主要贡献类型源排放强度的敏感性。最终，对渤海PAHs大气沉降通量及其污染来源形成规律性认识，为治理渤海污染提供依据。

The present study will monitor atmospheric concentration and deposition flux of polycyclic aromatic hydrocarbons (PAHs) around the Bohai to assess the tempeoral change of the deposition flux and its source contribution. ChnMETPOP and CanMETOP will be improved by nested method before the application. The optimization of the environmental parameters included in both models will be investigated from long-term ChnMETPOP modeling results. After the verification of the modeling results of CanMETOP, the simulation results will be employed to identify the spatiotemporal variation of the deposition flux, and its association with the chemical's physicochemical properties and emssion, and environmental condition,and to summarize major control factors.By highlighting different source regions and source type in different model scenarios, the spatiotemporal pattern and the contribution from these sources to the Bohai will be quantified and identified. Multiple model scenario simulations will be performed to assess the response of the deposition flux to the change of main contribtuion type sources in main contribution source areas. Based on the results and outcomes of this proposed study, the rule of the atmopheric deposition to the Bohai and its source contribution will be summarized to support policy of the China government in the government of the Bohai in environmental issues.