中文摘要：

利用Mie理论模型对不同粒径分布和复折射率的矿物质颗粒吸收和散射特性进行了模拟计算。颗粒的衰减和散射效率随着参数ρ的增大呈现出振幅依次减小的一系列有规则的振荡变化，而吸收效率则随着ρ的增加而增大；随着颗粒吸收性的增强，散射效率和吸收效率随着p的增大最终都将趋近极限值1。对于矿物质颗粒群，颗粒群的粒度分布变化对散射和后向散射特性影响很大，小粒径粒子对散射和后向散射的贡献比较大；折射率实部以及虚部变化对散射特性均有影响，颗粒的吸收性越强，则散射会相应地减弱；粒度分布以及折射率虚部对吸收系数也存在较大的影响，但是折射率实部对吸收系数的影响不大。

英文摘要：

The optical properties of mineral particles suspended in seawater were calculated based on the Mie theory for different slopes of Junge-Type size distribution and complex refractive indices. With the increase of parameter ρ, the attenuation and scattering efficiency undergoes a series of regularly decreasing oscillations, while the absorption efficiency simply increases; and the scattering and absorption efficiencies will tend to the limiting value of 1 for the strong absorbing particles. For the polydispersed mineral particles, the mass-specific scattering and backscattering coefficient is sensitive to the size distribution of particles, the small particles in diameter are the main contributors for the scattering and backscattering coefficient; and the influences of the real part and imaginary part of refractive index on the scattering and backscattering coefficient are also strong, stronger absorption will weaken scattering accordingly; the effects of size distribution on mass-specific absorption coefficient are also obvious, while the real part of the refractive index has less effects.