永兴岛海洋气溶胶粒子谱反演研究

A Study on Remote-Sensing Inversion of Aerosol Particle Size Distributions over Yongxing Island

地基遥感方法可以直接得到大气气溶胶的辐射特性,用于气溶胶粒子谱分布特征的研究。利用ASD地物光谱仪在永兴岛海洋站楼顶获取的太阳辐射实测数据,应用蒙特卡罗方法随机生成气溶胶4种组分比例近似求解消光方程来反演气溶胶粒子谱。结果表明,实验期间永兴岛气溶胶各组分比例与标准辐射大气模型中的海洋型气溶胶相似;体积谱为双峰分布,2个主峰分别位于0.01~0.1μm和1~10μm;数浓度谱为单峰分布,主峰位于0.001~0.01μm;数浓度和体积浓度变化规律与海水扰动、粒子的干湿沉降过程有关,与浑浊度指数相关性达98%以上,可用来表征大气浑浊程度。

Ground-based remote sensing can directly get the radiation characteristics of atmospheric aerosol,which can be used in the study of aerosol particle size distribution. Atmospheric monitoring experiment was carried out on the roof of Marine Station by using ASD spectrometer and the solar radiation was measured. Based on obtained data,this paper applies Monte Carlo to randomly generate the proportions of four aerosol components which are used to approximately solve the extinction equation to retrieve aerosol particle size distribution. The result shows that during the period of experiment the aerosol type of Yongxing Island is similar to the marine aerosol defined by the standard radiative atmosphere; the volume size distribution is bimodal distribution with the peaks at 0. 01 ~ 0. 1 and 1 ~ 10 μm respectively; the number concentration distribution is unimodal distribution with the peak at 0. 001 ~ 0. 01μm; the change rule of aerosol number concentration and volume concentration is relevant to both the movement of sea water and the deposition of aerosol particle; the correlation coefficients for number concentration and turbidity index,volume concentration and turbidity index are above 98%,which means that number and volume concentrations can be used to represent the atmospheric turbidity.