中文摘要：

利用激光雷达探测分析了兰州上空的高云与气溶胶的光学参数，并用LOWTRAN7定量模拟出高云对气溶胶辐射特性的影响。结果表明，消光系数廓线与相对湿度廓线随高度的变化一致性较好，气溶胶层主要在2km以下，低层气溶胶和高云的消光系数和相对湿度较大。白天，高云的存在使云下气溶胶短波加热率减小。有云和无云时气溶胶加热率的差别在地表处最为明显，中午前后差别较大，最大为11：00的0．096K·h^-1夜间，高云的存在使云下气溶胶长波冷却率减小，在1000m以下有云和无云时气溶胶冷却率的差别小，在1000m以上差别大，最大差别出现在1500m处（02：00～04：00），为0．033K·h^-1。

英文摘要：

The optical parameters of high cloud and aerosol were probed by a micro lidar （CE 370--2） over Lanzhou. Numerical simulation is implemented by LOWTRAN7 model to indicate the influence of high cloud on the radiative effect of aerosol under high cloud. Preliminary analysis on the collected data indicates a good consistence between the extinction coefficient measured by lidar and vertical profile of the relative humidity retrieved by a profiling microwave radiometer （TP/WVP3000）, both with maxmum values located within the cloud and at the low level in the boundary layer. The aerosols are located below 2 km. The high cloud decreases the aerosol heating rate under its floating layer in the daytime. The difference with and without cloud is obvious at noon near the ground surface. The difference of peak value is 0. 109K·h^-1 at 11：00. At night, the high cloud leads to weaken the aerosol cooling rate. The difference of peak value is about 0. 033K·h^-1 during 02：00 to 04.00 on altitudes of 1500 rn, however the difference is not obvious under 1000 m.