上海是东亚重要的沿海城市之一,其上空大气气溶胶光学特性的研究对了解上海及我国东部沿海地区的环境和气候影响等方面都具有重要性,至今尚无这方面的实际观测分析.本工作利用2000年6月到2002年12月之间测得的上海地区太阳直接辐照度数据,分析之后得出大气气溶胶光学厚度值,并统计分析了大气气溶胶光学厚度的季节变化及其与地面能见度的关系,最后给出了气溶胶消光谱.通过上述工作,发现上海地区大气气溶胶光学厚度具有夏季最大,春季次之,冬季最小的相对稳定的特点.此外,地面能见度及其倒数作为一个相对容易获得的参数,与大气气溶胶的光学厚度具有较好的相关性,可以考虑将其倒数作为一个约束气溶胶光学厚度分布的物理参数,这对今后的观测和研究都具有一定的实际意义.
Shanghai is one of the important coastal city in East Asia, the study of atmosphere aerosol optical characteristics over this region is important for understanding the environment and the climate simulation in Shanghai and East China. This work used the observation data of the direct solar irradiance from June 2000 to December 2002 to obtain the aerosol optical depths (AOD) . Then we analyzed the statistical characteristics of AOD, such as sea.hal variation, correlation with surface visibility, etc. At last, we drew the spectral distribution of AOD. The results show that the AOD in Shanghai is largest in summer, then less in spring, and smallest in winter. In addition, the surface visibility and its reciprocal has nice correlation with the AOD, it can be used as a parameter to restrict the AOD distribution.