兰州冬季大气气溶胶光学厚度及其与能见度的关系

Lanzhou Aerosol Optical Depth in Winter and Their Relation with Visibility

利用光度计资料,计算了兰州冬季大气气溶胶的光学厚度,并利用计算结果进一步得出了Angstrom浑浊度系数β和波长指数α,对计算结果的分析表明,兰州冬季气溶胶与历史同期相比,光学厚度较大,浑浊度较高,且多为大粒子。此外,本文还对气溶胶光学厚度与能见度进行了分析、拟合,二者的变化趋势正好相反,光学厚度与能见度之间近似呈指数递减的关系。

Utilizing the data monitored by sun photometer, the aerosol optical depth of Lanzhou in winter was calculated, and the turbidity coefficient β and the wavelength exponent α were further calculated using aerosol optical depth. The results show that the aerosol optical depth and turbidity coefficient are larger than the same historical period, and the most of aerosols are large particles. The aerosol optical depth and visibility were analyzed and fitted in the paper, both the change trend is just opposite, and the relation between them appears the trend of exponent decrease.