【作者】 李洪敬；

【导师】 孙东松；

【作者基本信息】 苏州大学 ， 光学， 2005， 硕士

【摘要】 文中综述了激光雷达的发展现状,以及激光雷达探测大气气溶胶消光特性的理论基础;详细介绍了一套自行研制的米散射大气激光雷达系统,并重点分析了苏州上空大气气溶胶垂直消光特性的典型探测结果。探测结果表明:与一年中其它季节相比,苏州2004 年春季对流层中上部气溶胶的含量偏大;而在冬季,即便在3km 高度上,也会出现一个明显的干净层,表明当年冬的大气总体较为洁净。分析指出,从夏至冬,对流层底部的大气边界层高度集中在0.712km 到2.494km 之间变化,均值为1.692km。其中八月份的值最大,均值达到2.08km;而冬季其平均值仅为0.895km。苏州城区大气水平能见度的统计结果表明:在探测的100 多天里,晴日能见度从5.0km 至32.1km 之间变化,其平均值为13.38km。秋季的晴日能见度均值达到21.823km。此外,本文还探测并指出了三类云的消光分布特点以及云的动态变化特征。在本文的最后,作者简要总结了全文并指出了本文的创新之处。更多还原

【Abstract】 In the paper , a developing actuality on lidar and theory of extinction properties of atmospherical aerosol based on lidar detection are summarized . A system of lidar on the basis of Mie scattering is presented ; The detected results of aerosol extinction are analysed emphatically . The results show that ,compared with other seasons in 2004 , the content of aerosol over the middle and upper layers in the troposphere are more excessive in Spring ; But in Winter , there is a distinct clear layer , even over 3km height , which expresses that the atmosphere is more clear in this season . The analysis presents that , excluded the Spring season , the height of aerosol boundary layer changes from 0.712km to 2.494km with a mean value of 1.692km ; It reachs maximum mean value of 2.08km in August and minimum one of 0.895km in Winter . The statistic results indicate that horizontal visibility in Suzhou city changes from 5.0km to 32.1km with a mean value of 13.38km , which achieves mean value of 21.832km in Winter . In addition , the extinction coefficient distribution of clouds and its’dynamic evolvement are detected and analysed . In the end , the summarization on the whole paper is made ; Several points of innovation in the thesis are also pointed out .更多还原