珠三角一次重空气污染过程特征分析及数值模拟  

Characteristics Analysis and Numerical Simulation Study of a Severe Air Pollution Episode over the Pearl River Delta

作　　者：余纬[1] 罗栩羽[1] 范绍佳[1] 刘洁[2] 冯业荣[3] 樊琦[1] 

机构地区：[1]中山大学季风与环境研究中心大气科学系,广东广州510275 [2]环境保护部华南环境科学研究所,广东广州510655 [3]广州中心气象台,广东广州510080

出　　处：《环境科学研究》2011年第6期645-653,共9页Research of Environmental Sciences

基　　金：国家自然科学基金项目(40805043;40875007);国家高技术研究发展计划(863)项目(2006AA06A306);中山大学青年教师培育项目

摘　　要：以珠江三角州地区(珠三角)2009年11月23─29日一次重空气污染过程为例,利用常规观测资料及中尺度气象模式(MM5)、污染源排放模式(SMOKE)和空气质量模式(CMAQ)的模拟,研究此次重空气污染过程的特征.结果表明,造成此次重污染的主要原因有:①前期高压脊带来的稳定层结和静小风条件使得大气污染物逐日累积,难以扩散;②西太平洋台风向南海附近发展移动时,其外围下沉气流导致珠三角大气污染物向低层输送并积累.珠三角区域污染分布特征表明,广州和佛山的本地贡献明显,而肇庆等地受外地源输送的影响更为显著.Based on conventional observations and simulation results by the MM5 SMOKE CMAQ model,the characteristics of a severe regional air pollution episode which occurred over the Pearl River Delta（PRD） during 23rd to 29th November 2009 were analyzed.It was found that there were two main reasons for this event： one is the stable stratification and calm winds controlled by an anticyclone which led to the accumulation of air pollutants which were difficult to diffuse.Another is the descent airflow over the PRD brought by a strong tropical storm moving from the West Pacific to the South China Sea,which led to air pollutants over the PRD migrating to the ground and accumulating.From analysis of the spatial distribution features of the pollutants,it can also be seen that local sources are more significant in Guangzhou and Foshan,but regional sources play a more important role in Zhaoqing and other areas.

关 键 词：气溶胶 中尺度气象模式(MM5) 污染源排放模式(SMOKE) 空气质量模式(CMAQ) 边界层特征 

分 类 号：X16[环境科学与工程—环境科学]