气溶胶是城市污染的主要成分，也是气候评估中最大的不确定因子。利用2011年1月至2012年12月气溶胶观测资料，分析了新型超级城市深圳地区的气溶胶光学特性。深圳地区气溶胶表现出强吸收特征，散射、吸收系数的平均值（标准偏差）分别为(175.4±127.8)×10-6 m-1、(30.5±24.5)×10-6 m-1，单次散射反照率平均值为0.83，较北京、广州等国内城市观测值大，但小于国外城市的观测值。气溶胶光学特征呈明显的季节变化，散射、吸收系数和单次散射反照率均在冬季最大，夏季最小。气溶胶特征日变化不仅受边界层日变化影响，还与当地风向、污染源变化、光化学反应及夜间复杂的化学反应有关。利用轨迹模式聚类分析不同来源气溶胶的光学特征，结果表明当气溶胶来源于污染地区和城市人口密集区时，气溶胶的光学特征值都较高，尤其冬季。来自污染地区的气溶胶单次散射反照率不仅大于来自干净地区的气溶胶单次散射反照率值，且大于污染源地区的值。

Atmospheric aerosols are not only a major component of urban air pollution, but also one of the largest sources of uncertainty in the assessment of the climate evaluation. Aerosol optical properties are investigated at Shenzhen in Pearl River Delta of China according to the observation data of aerosol from 2011 to 2012. The aerosol at Shenzhen is characterized by strongly light-absorbing characteristics. Mean values (standard deviation, SD) of scattering and absorption coefficients for the entire period are (175.4±127.8)×10-6 m-1 and (30.5±24.5)×10-6 m-1, respectively. The mean single scattering albedo (SSA) for the entire period is estimated as 0.83, which is higher than the values reported for the domestic cities, such as Beijing and Guangzhou, but lower than that in foreign cities. The absorption, scattering coefficients and SSA values show a seasonal cycle with the lowest values in summer, while the highest values in winter. Their diurnal variations cannot be solely explained with the change of atmospheric boundary layer, and the influence of local wind patterns, variation of pollution, photochemial reaction and the complex chemical reaction at night should also be considered. A trajectory cluster analysis is applied to discern the source characteristics of aerosol optical properties for different air masses. The results show that the values of optical properties are all high when the air masses come from the dense population centers in industrial areas and contaminated regions, especially in winter. The cluster-mean SSA for aerosol coming from the polluted areas is not only higher than those from the “clean” directions, but also higher than the reported values for the regions with high pollution emissions.