人类活动改变了城市下垫面特征，通过陆面过程、湍流输送等物理过程影响城市边界层结构和大气环境容量。本项目将研究目标聚焦在城市化对城市大气边界层和城市大气环境容量的影响上，以北京城区作为研究对象，基于高分辨率的陆面资料数据、城市冠层参数数据集和人为热排放清单，优化模式中关于城市边界层模拟的精度；同时结合基于最优插值方法获得的同化模拟污染物浓度的数据，以期提高数值模式精确地模拟大气污染对边界层气象反馈影响的精度；并且利用模式通过设置敏感性试验的手段，模拟研究城市化进程中城市大气环境容量的演变特征，揭示城市化对大气边界层和大气环境容量影响的可能机制。研究结果为城市大气污染防治、城市污染物排放总量控制和城市规划布局提供科学依据。

Human activity altered underlying surface characteristics over urban area, and then affected urban boundary layer structure and atmospheric environmental capacity via physical processes such as land surface processes and turbulent transport. Taking Beijing city as a research object, this project focuses on the influence of urbanization on urban atmospheric boundary layer and environmental capacity. Using high resolution land surface data, urban canopy parameter dataset and anthropogenic heat emission inventory, urban boundary layer simulation is improved. The feedback processes from atmospheric pollution to boundary layer meteorology, simulated by numerical model, are improved combined with assimilated pollutant concentration based on optimal interpolation method. Through numerical sensitivity tests, this project studies variation characteristics of urban atmospheric environmental capacity during urbanization processes, and reveals possible mechanism of impact of urbanization on atmospheric boundary layer and environmental capacity. The results provide scientific basis for urban atmospheric pollution control, urban total pollutant emission control, and urban planning layout.