【摘要】 2009年4—12月于华东理工大学某实验楼楼顶利用浊度仪对大气散射系数进行监测,同时采集获得PM2.5质量浓度,分析其成分组成和不同季节散射系数日变化特征、散射系数与PM2.5的相关性,以及大气能见度与PM2.5成分的幂函数关系.结果表明,散射系数秋、冬季较高,夏季最小.日变化特征在6:00和18:00各出现1个峰值,秋、冬季晚高峰较显著,夏季日变化较平缓;4个季节比较,PM2.5质量浓度与散射系数均呈现良好线性关系;春季大气能见度与PM2.5中二次离子呈显著幂函数相关性,夏季能见度与EC相关性显著,秋季能见度与有机物和二次离子均呈显著性幂相关,冬季能见度与各组分关系不显著.更多还原

【Abstract】 We used a nephelometer to monitor scattering coefficients on the top of a laboratory building in East China University of Science and Engineering from April to December in 2009.PM2. 5was simultaneously sampled every day to obtain its mass concentrations and its chemical components. We studied characteristics of diurnal variation in scattering coefficients in different seasons,correlations between scattering coefficient and PM2. 5,and power correlation between visibility and chemical components of PM2. 5. Results indicated that scattering coefficients were higher in autumn and winter and lower in summer. The diurnal variation of scattering coefficientindicated two peaks observed at 6: 00 and 18: 00,respectively. The peak value was higher in autumn and winter but the diurnal variation changed little in summer. The seasonal comparison indicated that scattering coefficients had strong linear correlations with PM2. 5in all the seasons. It was found that visibility had power function correlations with secondary ions in spring,with EC in summer,and with both organic components and secondary ions in fall. Due to the complexity of components,sources,and formation mechanisms,no obvious correlations between visibility and components were found for winter.更多还原