利用激光雷达观测资料研究兰州气溶胶光学厚度  

Analysis of Aerosol Optical Depth over Lanzhou Based on Lidar Measurement

作　　者：周碧[1,2] 张镭[1] 蒋德明 曹贤洁[1] 隋兵 

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,甘肃兰州730000 [2]湖南气象科学研究所,湖南长沙410007

出　　处：《干旱气象》2013年第4期666-671,共6页Journal of Arid Meteorology

基　　金：国家自然科学基金项目(41075104);兰州大学中央高校基本科研业务费专项资金(lzujdky-2013-bt04);湖南省气象局短平快基金项目共同资助

摘　　要：利用兰州大学半干旱气候与环境观测站（SACOL）2006—2011年晴空无云时激光雷达（CE-370—2）资料，结合2006年12月至2007年5月多波段太阳光度计（CE-318）资料，对比验证了激光雷达资料的反演结果，并分析了兰州地区气溶胶光学厚度的分布特征。结果表明：激光雷达反演得到的光学厚度与光度计观测得到的光学厚度，两者具有较好的相关性，相关系数为0．86。兰州地区气溶胶光学厚度3—5月和11-12月较大，主要原因是3—5月是当地沙尘频发期，11—12月是居民集中采暖期，沙尘排放和燃煤排放显著增加了大气气溶胶光学厚度。气溶胶光学厚度6～10月偏小，湿沉降清除是主要的影响因素。光学厚度季节分布为春季0．42，冬季0．36，秋季0．30，夏季0．21。光学厚度频数分布于0．0～0．3的最多，占总数的一半，且存在季节差异。兰州上空夏季干净，春季浑浊，冬季次浑浊。Based on the lidar （ CE - 370 - 2） observations under clear sky condition from 2006 to 2011 in the Semi - Arid Climate and Environment Observatory of Lanzhou University （SACOL）, and combined the multi -channel sun photometer （CE -318 ） data from December 2006 to May 2007, the AOD retrieved from the Lidar was compared with the interpolation AOD of the sun photometer, in ad- dition, the characteristics of AOD over Lanzhou were analyzed. The results suggest that AODs retrieved from the lidar system and ob- served by the sun photometer （ CE - 318 ） had good correlation with the correlation coefficient of O. 86, the retrieval method of lidar da- ta was believable. The values of aerosol optical depth were quite high from March to May, which was mainly caused by dust occurring frequently, and AODs＇ values were also very high from November to December, which was primarily caused by man -made coal burn- ing for protection against cold. While AODs＇ values were extremely low from June to October, which was prevailingly caused by the wet deposition clearing. The seasonal distribution of aerosol optical depth showed that AOD was O. 42 in spring, O. 36 in winter, 0. 30 in autumn and lowest in summer with the value of 0.21. The frequency of aerosol optical depth is about 50% below 0. 3 with the signif- icant seasonal differences. The results illustrate that the sky over Lanzhou region is clean in summer while it is turbid in spring and next in winter.

关 键 词：激光雷达 兰州地区 气溶胶光学厚度(AOD) 频数分布 

分 类 号：P407.1[天文地球—大气科学及气象学]