细胞结构对浮游植物光学特性的影响

Effects of algal cell structure on the optical properties of phytoplankton

藻细胞抽象为细胞质和叶绿体构成的两层球体结构,结合Aden-Kerker散射理论,分析了藻细胞各物理属性对其光学特性的影响,同时也与均匀球体藻细胞的光学特性进行了对比分析。分析结果表明,与均匀球体结构相比,叶绿体为外裹层的细胞结构将显著增强其后向散射效率及后向散射比率,而叶绿体为内核层的细胞结构因打包效应将削弱藻细胞的吸收效率;当叶绿体为外裹层时,细胞粒径大小、叶绿体相对体积、叶绿体复折射率的虚部都对藻细胞的吸收效率会产生显著影响;同时,细胞粒径大小和叶绿体复折射率实部是决定细胞后向散射效率和后向散射比率的两个重要指标。

The algal cells were first simplified as two-layer structure consisting of cytoplasm and chloroplast, and based on Aden-Kerker theory, the influence of physical properties of algal cells on their optical properties was then discussed. The results were also compared with the optical properties of homogenous spherical algal cells. They showed that, compared to homogenous spherical cell structure, the cell structures with chloroplast as outer would enhance the backscattering efficiency factor and backscattering ratio, while the cell structure with chloroplast as core would reduce the absorption efficiency due to package efficiency; For the algal cells with chloroplast as outer, the variations of cell size, relative chloroplast volume and the imaginary part of refractive index of chloroplast would have important influence on absorption efficiency of algae; both cell size and the real part of refractive index of chloroplast were the two key factors for backscattering efficiency and backscattering ratio of algae.