大气颗粒物色度特征及其物源指示意义

Characteristics of color index and it's source indicator significant for atmospheric particulate matters

运用色差仪测试上海及北方城市大气颗粒物色度特征,研究大气颗粒物色度的四季变化规律,探讨大气颗粒物色度的影响因素及物源指示意义。结果表明:2009年10月-2010年10月间,上海市普陀、闵行、青浦三个采样点大气颗粒物色度四季变化规律基本一致:明度、红度总体呈增加趋势;黄度仅在沙尘暴期间明显增加,其余则相对较小。北方城市春季大气颗粒物色度变化明显,其黄度变化与上海市春季大气颗粒物黄度变化特征呈较好的正相关关系,指示各采样点春季大气颗粒物的物质来源相似。沙尘暴大气颗粒物的色度特征介于非沙尘暴大气颗粒物和黄土之间,指示沙尘暴期间大气颗粒物部分物质与黄土具有相同的物源联系,部分物质来源于人为源污染。因此,色度尤其是黄度可作为示踪沙尘暴大气颗粒物的指标。

In this study, color indices of atmospheric particulate matters from Shanghai and the Northern Cities were researched to indicate their seasonal variations of atmospheric particulate matter and to analyze their effect factors and source indicator significant. The results showed that from Oct. 2009 to Oct. 2010, the seasonal vari ations of color indices of atmospheric particulate matters from three sampling points were consilient with each oth er, the rightness and redness of atmospheric particulate matters increased with time/apes, yellowness increased obviously during the time of dust storm, and decreased during the time of non dust storm. The color indices of atmospheric particulate matters in spring from the Northern cities changed yellowness had good correlation with atmospheric particulate matters from with time lapes, and its variation of Shanghai, which indicated that the