Abstract:

Through monitoring and analysis on atmospheric aerosol at surface boundary layer over Lanzhou city in March and April in 2002，some results are given out as follows：（1）The quality concentration of TSP over Lanzhou city is increasing evidently while the dust weather is occurring，and the more strong the sand dust is，the more high the quality concentration of TSP is，and the air pollution is more severe；（2）The quality concentration of TSP corresponds to that of PM10 well over Lanzhou city under different weather conditions，and the more strong the dust is，the more high the quality concentration of TSP and PM10 is，but the increase or decrease proportion of TSP and PM10 quality concentration is different；（3）The quality concentration of the same level particles is different under different weather conditions，but the quality concentration distribution of the diversified level particles is same under the same weather condition；（4）The sample chroma of TSP corresponds to the air quality in some degree ，if the value of L*，a*and b* is larger，then the sand dust in air is more and the air pollution is more severe，and the air pollution primarily comes from local black organic substance because the value of L*，a*and b* is much less under normal weather condition.

Key words: atmospheric aerosol, quality concentration, air pollution, chroma

摘要：

对兰州市区2002 年春季3 ～ 4 月近地层TSP 连续观测资料进行分析，结果表明：（1）兰州市区TSP 的质量浓度随着沙尘天气的发生而显著增加，沙尘天气越强，TSP 的质量浓度越高，对兰州市区的空气污染越严重；（2）在不同天气情况下，兰州市区TSP 与PM10的质量浓度有很好的对应关系，沙尘天气越强，其质量浓度都越高，但两者增减的比例各不相同；（3）在不同天气情况下，同级粒径粒子的质量浓度各不相同，但在同种天气情况下，各级粒径粒子质量浓度的分布规律却相同；（4）TSP 样品色度的3 个独立分量与空气质量有一定的对应关系，L*、a*、b*值越大，空气中沙尘含量越高，空气污染越严重，兰州市区在一般天气情况下L*、a*、b*值均较小，说明兰州市区空气污染主要以本地排放的黑色有机物为主。

关键词: 大气气溶胶, 质量浓度, 空气污染, 色度