南京上空气溶胶光学特性的激光雷达观测  

Application of Lidar to Observational Study on Aerosol Optical Properties of Nanjing City

作　　者：牛晓庆[1] 姜杰[2] 皮科武[3] 陈吉春[3] 郑有飞[2] 刘建军 

机构地区：[1]华中科技大学武昌分校城市建设学院环境工程教研室,湖北武汉430064 [2]江苏省气象灾害重点实验室,江苏南京210044 [3]武汉理工大学资源与环境工程学院,湖北武汉430070 [4]马里兰大学,地球系统科学多学科研究中心,马里兰20740

出　　处：《环境科学与技术》2014年第5期36-41,共6页Environmental Science & Technology

基　　金：江苏省高校自然科学研究重大项目(09KJA170004);国家自然科学基金面上项目(41075114);国家重点基础研究发展计划项目第五课题(2006CB403705)

摘　　要：文章利用偏振微脉冲激光雷达对南京上空大气散射特性进行了为期一年的连续观测,同时结合MODIS卫星数据对空气中气溶胶光学特性的日季变化进行了分析研究,利用HYSPLIT模式分析了其变化的原因。研究结果表明,在春、秋、冬季,气溶胶消光后向散射比分别为48 sr,45 sr和40 sr,退偏振比分别为0.18,0.19和0.2,且气团主要来源为我国西北及北方地区;夏季,气溶胶消光后向散射比为63 sr,退偏振比为0.11,气团主要来自东南部工业污染城市以及南京周边地区;气溶胶的垂直分布有明显的季节变化趋势,低层(<1 km)气溶胶光学厚度从大到小为:冬季-夏季-秋季-春季,高层(>1 km)为:夏季-春季-秋季-冬季;气溶胶光学厚度有明显的日变化特征,在夏冬两季表现为早晚高,中午低;在春秋两季则为早晚低,中午高。文章对南京上空大气气溶胶的光学特性进行了详细系统的研究,对于该地区大气环境以及气候效应的研究具有重要的学术价值。Continuous observation of atmospheric diffusion properties was taken place from Nov. 2010 to Oct. 201l in Nanjing City using MPL, and seasonal change of optical properties of aerosol over the City was analyzed with the data of HYSPLIT to explain the reason of the change. Results of the study indicated that air mass was from northwest and north China in spring, autumn and winter, with the extinction-to-backscatter ratio 48 st, 45 sr and 40 sr respectively, on the other hand, air mass came from southeast industrial towns and the city＇s surrounding areas during summer, with the extinction-to- backscatter ratio of 63 sr and depolarization ratio of 0.11：2. The vertical distribution of aerosol very much varied seasonally. Significant diurnal variations of optical depth were noted, i.e. AOD in summer and winter was higher in the morning and evening, lower at noon, while reversed in spring and autumn seasons.

关 键 词：消光后向散射比 消光系数 光学厚度 后向轨迹 

分 类 号：P412.25[天文地球—大气科学及气象学] X16[环境科学与工程—环境科学]