OALib Journal期刊
ISSN: 2333-9721
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浙江省城市大气污染特性研究
DOI: 10.13232/j.cnki.jnju.2015.03.006
Keywords: 浙江,污染特性,颗粒物,排放物,水溶性离子
Abstract:
本文以浙江省城市(主要指杭州)为研究区域,利用大气成分观测数据,通过对比、相关分析研究了浙江省城市的大气污染特性。研究结果表明,2011-2013年间,杭州pm2.5和no2月均质量浓度均呈上升趋势,增幅皆为10?g.m-3左右,pm10和so2则呈下降趋势,pm10降幅微弱,so2降幅为8?g.m-3左右。pm1、pm2.5、pm10质量浓度与大气消光系数之间相关系数为0.73、0.83和0.74,其中粒径为0.25-1.0?m的粒子对大气消光系数的贡献率最大,达到66.4%,1.0-2.5?m粒子为23.2%,大于2.5?m的粗粒子仅为10.4%。与临安相比,杭州no2日均浓度超标日数多了50天左右。杭州大气气溶胶中占主导地位的无机水溶性离子依次为no3-、nh4+和so42-,它们占到总水溶性离子浓度的52.66-96.61%,与北京、广州等地区so42->no3-的研究结果明显不同。no3-、nh4+浓度季节变化特点与no2相似,而且no3-和nh4+具有较好的相关性,so42-与so2浓度季节变化特点则不同。受夏季主导风向的影响,这一季节na+和cl-浓度最高,而秋季明显偏高的k+浓度是长三角秋季秸秆焚烧现象的指示。
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