中国东部若干地区大气气溶胶虚折射指数特征

利用直接取样和积分片方法对大气气溶胶的折射指数虚部n_i进行了大量的实际测量。根据测量结果,给出了中国东部不同类型地区气溶胶n_i的统计特征:城市地区为0.080;郊区为0.063;乡村地区为0.030;高山为0.012;南海区域为0.006。城市和郊区的n_i值,冬半年(11月至次年的5月)比夏半年(6月至10月)大,12月份的n_i为极大值。除南海外,中国东部各类地区的n_i值比国外同类地区偏大,这与把煤炭作为主要能源造成的燃煤烟尘污染有关。

Characteristics of imaginary part of aerosol refractive index in some areas of eastern China.

By using integrating plate method, the imaginary part in of aerosol refractive index is measured for the particles sampled at some places with different types of terrains in Eastern China. The measurement results reveal the statistic characteristics of imaginary part ni of aerosol refractive index in Eastern China: 0.080 in cities; 0.063 in suburbs; 0.030 in rural area, 0.012 in mountainous district, which may be taken as the background value of ni in Eastern China, and 0.006 in the South China Sea area. In city and suburb, in values in cool half year(November to next May)are larger than in warm half year's (June to October), and the ni value measured in December is maximum. The ni values in Eastern China except ocean region are larger than in corresponding types of terrains of other countries, which are relevant to the severe coal-fired smoke pollutants in Eastern China.