气溶胶粒子散射和吸收特性对复折射率依赖性的数值研究

A Numerical Study of Dependencies of Aerosol Scattering and Absorption on Its Refractive Index

利用米散射理论数值计算分析了尺度参数为0.1~100时球形典型气溶胶粒子的散射和吸收特性对复折射率的依赖性关系。气溶胶粒子复折射率的实部和虚部是一个有机的整体,粒子复折射率的实部和虚部可以分别影响其散射和吸收特性。若实际大气气溶胶粒子大多是成核模态和积聚模态的小粒子,基于气溶胶的散射和吸收特性可以获得其复折射率的唯一解。但是,如果大气中存在大量的粗模态粒子时,气溶胶散射和吸收特性对其复折射率的依赖性较为复杂,只有选择有限的合适复折射率库区间,才有可能获得更合适的有效复折射率。

The dependencies of aerosol scattering and absorption properties on its refractive index for size pa-rameters from 0. 1 to 100 are numerical investigated. Aerosol real part and imaginary part of refractive index affect both scattering and absorption properties, since they are an organic whole. For ambient aerosols, the re-trieved effective refractive index is unique for small particles in nucleation and accumulation models. However, if abundant coarse particles exist, the dependency of aerosol scattering and absorption on its refractive index is complex with the effective refractive index retrieved only in proper database.