Monitoring and Analysis on Atmospheric Aerosol at Surface Boundary Layer over Lanzhou City in March and April in 2002

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 PM_(10) well over Lanzhou city under different weather conditions,and the more strong the dust is,the more high the quality concentration of TSP and PM_(10) is,but the increase or decrease proportion of TSP and PM_(10) 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.