重庆市冬季PM及气态污染物的分布特征与来源

被引:31
作者
梁丹 [1 ]
王彬 [1 ,2 ]
王云琦 [1 ,2 ]
张会兰 [1 ]
李昂 [1 ]
张婉晴 [1 ]
张璇 [1 ]
机构
[1] 北京林业大学水土保持与荒漠化防治教育部重点实验室
[2] 不详
关键词
PM2.5; 气态污染物; 分布特征; 相关性; 轨迹聚类; PSCF分析; 重庆市;
D O I
10.13198/j.issn.1001-6929.2015.07.04
中图分类号
X51 [大气污染及其防治];
学科分类号
0706 ; 070602 ;
摘要
利用重庆市大气污染物监测站2013年冬季(2013年11月—2014年1月)的实测数据,分析PM2.5及相关气态污染物(SO2、NO2、O3)的时空特征,并采用轨迹聚类与PSCF(潜在源贡献因子)分析污染物来源.结果表明:除ρ(O3)以外,其他3种污染物质量浓度的月际变化趋势基本一致,均呈12月升高、1月降低的特征;污染物空间分布不均,其中ρ(PM2.5)和ρ(NO2)在工业区和人口密集区较高,ρ(SO2)南高北低,ρ(O3)城区低于郊区.ρ(SO2)、ρ(NO2)与ρ(PM2.5)均呈显著正相关,其中ρ(SO2)与ρ(PM2.5)的R(相关系数)在城、郊区分别为0.71、0.65,ρ(NO2)与ρ(PM2.5)在城、效区的R分别为0.73、0.56;而ρ(O3)与ρ(PM2.5)未表现出显著相关.ρ(SO2)、ρ(NO2)与ρ(PM2.5)的相关性高低可在一定程度上说明二次气溶胶的污染程度,ρ(O3)与ρ(PM2.5)的相关性受到PM2.5来源和污染程度的影响.轨迹分析结果显示,重庆市2013年冬季主要受东北方向气流影响;聚类分析表明,重庆市11月没有表现出明显的PM2.5外来输送特征,但12月和1月的PM2.5外来输送特征明显,并且不同方向的气流污染物浓度差异也较大.PSCF分析发现,重庆市冬季PM2.5、SO2、NO2、O3主要来源于本地和周围城市局地传输,同时还受南宁、贵阳、遵义、达州等地的影响.
引用
收藏
页码:1039 / 1046
页数:8
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