中文摘要：

利用2012年9月～2014年8月年合肥市西北郊的CE318型太阳光度计观测资料，分析了合肥地区气溶胶光学厚度（AOD）和Angstrom波长指数（理）的时间变化特征。结果表明，合肥地区AOD全年较高，2012年9月～2013年8月和2013年9月-2014年8月两个时段的年平均值分别为0．60±0．15和0．73±0．23。春季受沙尘天气影响气溶胶波长指数最小，秋季受西北高空气团影响AOD最低。研究了AOD和大气水汽含量之间的关系，结果表明AOD和大气水汽含量呈正相关关系。利用Hysplit风场轨迹模型对各个季节的风场进行了研究，合肥春季主要受西北气流（约42％）影响，夏季风场主要受偏南风场（约50％）影响，秋季受北风风场（约39％）影响较大，冬季受西北高空气团影响较大。CE318和MODIS对比结果表明，两者具有较好的一致性，相关系数在0．7以上。

英文摘要：

The temporal characteristics of Aerosol Optical Depth （AOD） and Angstrom exponent were analyzed using the sun photometer （CE318） data from September 2012 to August 2014 in north-west region of Hefei. It shows the aerosol optical depth in Hefei is higher in the whole year. The annual mean AOD is 0.60±0.15 from September 2012 to August 2013 and 0.730.23 from September 2013 to August 2014. The aerosol wavelength exponent in Spring is the least and the optical depth in the autumn is the least. The study of AOD and atmospheric water vapor content shows a positive correlation. The back trajectory analysis indicates that Hefei area is mainly influenced by northwest currents （about 42%） in spring, influenced by southward currents （about 50%）in summer, influenced by northward currents（about 39% ） in autumn and influenced by northwest in the high altitude. The relationship between MODIS retrieved and sun photometer CE318 shows a good agreement and the correlation coefficient is above 0.70.