Nilsson B
Appl Opt. 1979 Oct 15;18(20):3457-73. doi: 10.1364/AO.18.003457.
The aerosol extinction in various weather situations is calculated from Mie theory by use of an aerosol model which starts from dry particles. The particle size distribution and refractive index are adapted to actual air humidity by use of a growth factor, r/r(o), which is derived according to the theory of the relationship between relative humidity and the equilibrium radius of an aqueous solution droplet. It is shown that the particle number concentration in different size ranges has a dominating influence on the relation between the IR aerosol transmission and the meteorological visibility. Variations in air humidity affect the aerosol extinction mainly through modification of the particle size distribution. The effect on extinction due to the humidity influence on refractive index is proved to be of less importance.
利用一个从干燥颗粒出发的气溶胶模型，根据米氏理论计算各种天气情况下的气溶胶消光。通过使用一个生长因子r/rₒ，将粒径分布和折射指数调整到实际空气湿度，该生长因子是根据相对湿度与水溶液滴平衡半径之间关系的理论推导出来的。结果表明，不同粒径范围内的粒子数浓度对红外气溶胶透过率与气象能见度之间的关系具有主导影响。空气湿度的变化主要通过改变粒径分布来影响气溶胶消光。湿度对折射指数的影响所导致的消光效应被证明不太重要。
