Journal of Arid Meteorology

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Analysis of Aerosol Optical Depth over Lanzhou Based on Lidar Measurement

ZHOU Bi1,2ZHANG Lei1JIANG Deming2CAO Xianjie1SUI Bing2   

  1. 1. Key Laboratory for Semi - Arid Climate Change of the Ministry of Education,Lanzhou University,Lanzhou,730000,China;
    2. Hu’nan Institute of Meteorological Sciences,Changsha 410007,China
  • Online:2013-12-14 Published:2013-12-14

利用激光雷达观测资料研究兰州气溶胶光学厚度

周碧1,2张镭1蒋德明2曹贤洁1隋兵2   

  1. 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
  • 作者简介:周碧(1984 - )女,瑶族,湖南道县人,博士研究生,气象服务与应用气象工程师,主要从事气溶胶观测研究. E - mail: zhoub07@lzu. edu. cn
  • 基金资助:

    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)及湖南省气象局短平快基金项目共同资助

Abstract:

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 0. 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 0. 42 in spring,0. 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.

Key words:  lidar, Lanzhou region, aerosol optical depth (AOD), frequency

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。

关键词: 激光雷达, 兰州地区, 气溶胶光学厚度(AOD), 频数分布

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