中文摘要：

本文利用AERONET的气溶胶月平均数据，分析了北京市大气气溶胶体积谱的季节性变化，并对气溶胶体积谱与光学厚度、Angstrom指数、小颗粒比例以及单次散射反照率的关系进行分析。分析结果表明：在春季北京市气溶胶体积谱中粗模态粒子占的比重较大，峰值半径约为3扯m；在夏季北京市气溶胶体积谱中细模态粒子占的比重较大，峰值半径约为0．25胛；影响粗模态峰值异常增大的主要因素是沙尘，影响细模态峰值异常增大的主要因素是温度和湿度；在吸收性粒子浓度较低情况下，细模态粒子占主导地位时，单次散射反照率随波长的增大而减小，粗模态粒子占主导地位时，单次散射反照率率波长的增大而增大。

英文摘要：

This paper showed the seasonal variability of the volume distribution of atmospheric aerosol, using the monthly mean data at the AERONET site in Beijing, and discussed the correlation of aerosol optical thickness with Angstrom exponent, fine mode fraction, and single scattering albedo. The result showed that the coarse mode distributions at Beijing was predominant in spring, due to dust dominated cases being present mainly in the spring, and the maximum peek radius of the volume was about 3.0μm. the fine mode distributions at Beijing was predominant in summer, due to higher temperature and relative humidity in the summer, and the maximum peek radius of the volume was about 0.25μm. With lower concentration of the absorbing particles, when the fine mode particles were dominated , single scattering albedo would decrease as wavelength increasing, while the single scattering albedo would increase as wavelength increasing when the coarse mode particles were predominant.