天津市大气能见度与颗粒物污染的关系

利用天津市大气边界层观测站2009年能见度、相对湿度、风速逐时观测资料和2009年3月9~21日期间颗粒物的膜采样数据,分析天津市大气能见度与颗粒物污染的关系.结果表明,颗粒物质量浓度与能见度变化总体呈负相关,小粒径颗粒对能见度的影响作用明显,随着能见度的降低,小粒径颗粒与大粒径颗粒浓度的比值明显增加.能见度与颗粒物中总碳质量浓度变化呈负相关. SO42-,NO3-,OC和EC对大气消光贡献平均值分别为28.7%,6.1%,27.6%和19.2%.表明观测期间颗粒物中SO42-,OC对能见度的影响明显.

Relationship between atmospheric visibility and particulate matter pollution in Tianjin

Relationship between atmospheric visibility and particulate matter was analyzed using the observed hourly visibility,relative humidity,wind speed and particulate sample data at Tianjin atmospheric boundary station in 2009.Visibility had significant negative correlation with the mass concentration of the particulate matters.The ratio of mass concentration between PM2.5 and PM2.5~10 increased considerably when the visibility reduced,implying that PM2.5 played major role in the poor visibility.Atmospheric visibility also had significant negative correlation with the mass concentration of the total carbon.The average contribution of SO42-,NO3-,OC and EC to atmospheric extinction coefficient was 28.7%,6.1%,27.6% and 19.2%,showing that sulfate and organic carbon were the main components influencing the visibility.