【摘要】 利用一个耦合的区域空气质量模式系统,模拟了2004年4月1～7日门头沟排放的大气颗粒物浓度的时空分布及向北京主城区的输送过程,分析了下垫面非均匀性和气象条件对输送过程的影响以及源于门头沟污染物对主城区颗粒物浓度的贡献.模拟结果显示,门头沟排放的污染物能够被输送到主城区,存在输送通道,浓度分布表现出强烈的时空非均匀性.门头沟排放的PM10对主城区近地面浓度的影响可达0·1～15μg/m3.与观测的比较表明,模式对于PM浓度分布和输送态势具有较强的模拟能力,浓度相关系数及标准偏差分别为0·8、0·03.更多还原

【Abstract】 In this study, a coupled regional air quality modeling system is applied to simulate the time spatial variations in airborne particulate matters (PM) and the transport processes of PM originated from Mentougou to Beijing municipal area in the period of April 1 to 7, 2004. The influences of complex terrain and meteorological conditions upon boundary layer structure and PM concentration distributions are discussed. A comparison of the performance CALPUFF against the observed data is discussed and an examination of scatter plots is provided. The correlation coefficient and STD between the modeled and observed data are 0.8 and 0.03, respectively. Analysis of the model results illustrates that the pollutants emitted from Mentougou can be transported to Beijing municipal area along certain transport pathways, and PM10 concentration distributions show heterogeneity characteristics. Contributions of the Mentougou sources to the PM10 concentrations in Beijing municipal area are up to 0.1～15 g/m3.更多还原