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摘要： 利用CE318太阳光度计观测数据反演了广州市2015年晴空气溶胶的基本光学特性，分析其时间变化特征及探究本地污染来源，并基于HYSPLIT后向轨迹模型研究了广州大气污染外部输送来源的特征。结果表明：①2015年广州市AOD年均值为0.625，处于较高的水平。其中，春季AOD值最大，其余依次为秋季、冬季、夏季，具有明显的季节变化特征；②气溶胶基本光学特性的日变化与人类活动密切相关，道路交通污染是大气气溶胶的主要来源；③大气污染受外部输送的影响具有明显的季节变化特征，与本地排放叠加，使得广州大气污染加重，且常年有海洋性粒子输送；④各个季节波长指数均大于1，主要分布在0.8~1.4区间内，全年气溶胶组分稳定，以较小粒径的气溶胶为主。总体看来，广州地区气溶胶类型主要为城市—工业型和海洋性气溶胶的混合类型。 Abstract: The basic optical properties of clear-sky aerosol of Guangzhou in 2015 were retrieved using CE318 sun photometer data，and their temporal variation characteristics were analyzed and local pollution sources were explored.based on the HYSPLIT backward-trajectory model，the characteristics of external transport sources of air pollution in Guangzhou were studied.The results show that：（1) in 2015，the annual average AOD in Guangzhou is 0.625，which is at a relatively high level.Among them，AOD is the largest in spring，followed by autumn，winter，and summer，with obvious seasonal variations;（2) the daily variation of aerosol basic optical properties are closely related to human activities，and road traffic pollution is the main source of atmospheric aerosol;（3)Air pollution affected by external transport has obvious seasonal variation characteristics，which is superimposed with local emissions，causing air pollution in Guangzhou to be worse，and marine particles transport occurs all year round;（4) the wavelength exponent of all seasons is greater than 1，and is mainly distributed within the interval of 0.8 to 1.4.The aerosol components are stable throughout the year，mainly with smaller particle size aerosols.In general，the aerosol type in the Guangzhou area is mainly a mix of urban-industrial and marine aerosols.

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