【摘要】 目的研究气溶胶散射系数与空气颗粒物PM10、PM2.5浓度变化间的关系。方法于2009年12月23日到2010年1月5日(冬季)、2010年3月23日到4月5日(春季)和2010年7月23到8月5日(夏季)间,在武汉大学校区内,采用积分式气溶胶浊度计获取了各季节的气溶胶散射系数数据,同时对颗粒物PM10、PM2.5以及其组分中有机碳(OC)和无机碳(EC)的质量浓度进行了测定,分析了各污染物随季节浓度变化特点以及污染物浓度与气溶胶散射系数间关联性。结果武汉大学校区内PM10、PM2.5浓度以及其组分OC和EC的浓度随季节变化的分布特征均呈现冬季>春季>夏季的特点。关联性分析的结果显示,各季节气溶胶散射系数与颗粒物PM2.5浓度间存在中度以上的正相关关系,相关系数均大于0.6。多元线性回归结果显示,对温度、相对湿度以及风速等因素进行控制后,回归模型对PM2.5的解释能力超过75%,在冬季和夏季更可达96%以上。结论气溶胶散射系数与PM2.5浓度间关联性因季节的不同而受环境因素的影响亦不相同,在控制了环境温湿度以及风速等因素的影响后,可以有效提高气溶胶散射系数对PM2.5浓度预测的准确性。更多还原

【Abstract】 Objective To study the relationship between concentration changes of particulate matter and aerosol scattering coefficient.Methods During three study periods,Dec.23,2009-Jan.05,2010(winter),Mar.23-Apr.05,2010(spring),and Jul.23-Aug.05,2010(summer),data of aerosol scattering coefficients were captured by Integrating Nephelometer Model 3563;in every same period,the concentrations of PM10,PM2.5 and organic carbon(OC) and element carbon(EC) were determined in the campus of Wuhan University.The characteristics of the seasonal changes of pollutants were described,and the relationship between concentration changes of particulate matter and aerosol scattering coefficient was analyzed.Results Seasonal characteristics displayed that among of three seasons,concentrations of PM10 and PM2.5 as well as concentrations of OC and EC in winter were higher than those in spring,in summer they were lowest.A moderate positive correlation was found between aerosol scattering coefficients and concentration changes of PM2.5 in each season.Moreover,all of the correlation coefficients were greater than 0.6.Multiple linear regression results showed that explanatory power to PM2.5 of regression model can reach to 75%,even to 96% in winter and summer,under controlling the temperature,relative humidity and wind velocity.Conclusion The relationship between concentration changes of PM2.5 and aerosol scattering coefficient will be affected by various environmental factors depending on the different seasons,so,under the full consideration of environmental factors adjustment,aerosol scattering coefficient may improve the prediction accuracy of PM2.5 concentration changes.更多还原