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利用Mie理论模型对不同粒径分布和复折射率的浮游植物吸收和散射特性进行了模拟计算。在550nm波长处,直径<10μm的颗粒对总的散射系数贡献最大,单位体积浓度的散射系数随着折射率实部n的增大呈有规律的地增加。对给定的n值来说,随着微分粒径分布参数j值的增大而增加,折射率实部n对单位色素浓度的吸收系数ap*(λ)的影响很小,对bp*(λ)影响相对较大。折射率虚部n′对单位色素浓度的吸收系数ap*(λ)的影响很大,对bp*(λ)的影响相对较小。微分粒径分布参数j对ap*(λ)和bp*(λ)的影响都很大,ap*(λ)随j值的减小而减小的主要原因是因为大颗粒“打包效应”引起的吸收减弱,而bp*(λ)随j值的增大而增大的主要原因是因为小粒径颗粒对散射的贡献。
Mie theoretical model was used to simulate the absorption and scattering characteristics of phytoplankton with different particle size distribution and birefringence. At 550 nm, the particles with diameters <10 μm contribute most to the total scattering coefficient, and the scattering coefficient per unit volume concentration increases regularly with the increase of the real part of the refractive index n. For a given value of n, as the value j of the differential particle size distribution increases, the real part n of the refractive index has a small effect on the absorption coefficient ap * (λ) for the unit dye concentration, and for bp * ( λ) is relatively large. The imaginary part of refractive index n ’has a great influence on the absorption coefficient ap * (λ) of the unit pigment concentration and has a relatively small effect on bp * (λ). The effect of differential parameter j on ap * (λ) and bp * (λ) is very large. The main reason for the decrease of ap * (λ) with decreasing value of j is that the large particle “packing effect” The main reason for the increase of bp * (λ) with the increasing value of j is that the small particle size particles contribute to the scattering.