2010年中国东部PM_(2.5)空间分布及沉降模拟研究  

Numerical simulation of the spatial distribution and deposition of PM_(2.5) in East China coastal area in 2010

作　　者：程念亮[1,2,3] 孟凡[1,3] 王继康[3] 陈云波[3] 肖伟[3] 韩鸿飞 

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]北京市环境保护监测中心,北京100048 [3]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [4]北京市环境影响评价评估中心,北京100089

出　　处：《安全与环境学报》2015年第6期305-310,共6页Journal of Safety and Environment

摘　　要：结合我国目前面临的PM_(2.5)污染严重问题,采用CMAQ 4.7.1模式模拟我国东部各省PM_(2.5)浓度分布,并探索了其输送、沉降规律。结果表明:综合空气质量模式CMAO模拟结果与观测结果较为一致,可以较好地模拟PM_(2.5)质量浓度变化特征;我国东部PM_(2.5)呈现明显的季节分布特征,且PM_(2.5)质量浓度分布与污染源的位置分布有较好的对应,呈现由城市边缘向城市中心推移递增的趋势,区域性PM_(2.5)高值中心可达120μg/m^3以上;湿沉降是细颗粒物的主要去除方式,且湿沉降量至少为干沉降量5倍以上;PM_(2.5)夏季沉降通量最大,冬季最小,我国东部地区沉降通量高值中心可达30 mg/(m^2·d)以上;模拟区域湿沉降量占总沉降量的91%以上,模拟计算区域的总沉降量为4.67×10~6 t/a,其中京津冀地区细颗粒物总沉降量为1.65×10~6 t/a。Confronting with the serious PM（2.5） pollution problem in East China coastal area,the primary objective of this paper is to simulate the distribution of PM（2.5） and its migrating deposition in the atmosphere of the above said area in 2010.The so-called East China coastal area here mentioned includes,first of all,the area of BeijingHebei-Tianjin,Liaoning,Shandong,and Jiangsu.For the analysis convenience,we prefer to adopt an integrated modeling system consisting of meteorological model（WRF 3.2） and the community multiscale air quality（CMAQ 4.7.1） model.To implement the simulated evaluation,we have compared the simulated concentrations with the actual regional statistical data,which is helpful for confirming the simulating system we have chosen in this study.The simulated results we have gained prove well in accord with the facts of our observations.In addition,the CMAQ modeling system indicates that it is possible to simulate the regional concentration distribution of PM（2.5）,whereas the advanced analysis proves that PM（2.5） emission situation in some ways carries on the obvious geographical and temporal distribution features.What is more,the distribution of PM（2.5） in a given area coincides well with that of the PM（2.5） sources.Both of them increase from the edge to the downtown areas of the city.The simulation results tend to reveal that the regional centers of the high concentration of PM（2.5） can be 120μg/m^3.The wet deposition serves as the main way for the removal of PM（2.5） in comparison with that of the dry deposition,and the wet deposition flux of PM（2.5） tends to be at least five times as many as that of the dry one,which shows that PM（2.5） deposition flux in summer can be the largest while it may turn to be the least in winter.Moreover,the regional centers of high deposition flux of PM（2.5） in China East can be as high as up to 30 mg/（m^2·d）.And,finally,in the calculated area the rate of the wet deposition can be over 91%of the total deposition o

关 键 词：环境学 大气环境 CMAQ PM2.5 沉降 输送 

分 类 号：X131.1[环境科学与工程—环境科学] X513