摘要
为探究杭州市能见度下降的原因,2013年10月10日至11月2日,在杭州市进行了大气PM_(2.5)采样,并定量分析了其化学成分,通过消光系数和能见度的计算,确定了杭州市能见度与消光系数的关系。结果表明,杭州市PM_(2.5)日平均质量浓度为26.0~133.1μg/m^3,平均值为80.5μg/m^3,大气消光系数为145.9~657.7Mm^(-1),平均值为372.2Mm^(-1),消光系数的主要贡献因子为(NH_4)_2SO_4、NH_4NO_3、颗粒有机物(POM)和元素碳(EC)。二次粒子是影响杭州市大气能见度的最主要因素。Koschmieder公式能较好地描述能见度与消光系数的关系,得到杭州市的Koschmieder系数为1.81,可以用来预测杭州市的能见度水平。
In order to explore the causes of visibility in Hangzhou, PM2.5 samples were collected and PM2.5 com-positions were analyzed from October 10th to November 2nd ,2013. The relationship between light extinction coefficeints and visibility was established. Results showed that daily PM2 5 mass concentrations were 26.0-133.1 jug/m3 with a mean value of 80.5 jug/m3. The light extinction coefficients were 145.9-657.7 Mm 1 with a mean value of 372.2 Mm 1. The main contributors for light extinction coefficients were ammonia sulfate, ammonia nitrate, particulate organic matter （POM） and element carbon （EC）. Therefore,secondary particles were the main factors to affect the atmospheric visibility in Hangzhou. Koschmieder formula was applied to describe the relationship between the visibility and the light extinction coefficient. The estimated Koschmieder coefficient （1.81） could predict the visibility in Hang-zhou.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2016年第9期53-56,共4页
Environmental Pollution & Control
基金
环保公益性行业科研专项(No.201409008)
浙江省重大科技专项(No.2014C03025)
浙江省环保科研计划项目(No.2014A001、No.2014A007)
浙江省培育创新载体项目(No.2014F10042)
关键词
大气
PM2.5
能见度
消光系数
atmosphere
PM2.5
visibility
light extinction coefficients
