室内测量了十六种浮游植物的吸收-衰减光谱, 及其粒径分布和叶绿素a浓度。 研究结果表明, 粒径和单位细胞叶绿素浓度是影响浮游植物吸收和衰减系数量值的两个重要因素; 粒径是决定衰减光谱形状的重要因子之一, 粒径与衰减光谱斜率之间存在非单调的变化关系; 粒径不是影响浮游植物吸收光谱的蓝-红波段比和光谱斜率的决定性因子, 但是, 藻细胞密度与粒径平方的乘积是决定吸收光谱斜率的关键量。 适用于均匀球体颗粒的Mie散射理论能对粒径与浮游植物吸收光谱和衰减光谱间的相关关系进行阐释, 该文研究的藻类其非均匀球体结构并没有从根本上改变粒径与吸收—衰减光谱间存在的内在规律。

The spectral absorption and attenuation coefficients of 16 phytoplankton species were measured in the laboratory using acs instrument. Ancillary measurements included particle size distribution and chlorophyll a concentration (Chl a). The results indicated that both algal cell size and Chl a were the two major factors dominating the magnitudes of the spectral absorption and attenuation coefficients. The spectral behaviors of attenuation spectra were dominated by algal cell size, the relationship of them didn’t follow the monotonic function. Both the ratio of absorption in blue and red waveband and the spectral slope of absorption coefficient were influenced by the product of algal cell density and squares of cell size rather than algal cell size alone. The relationship between algal cell size and both absorption and attenuation spectra would be interpreted by Mie theory for homogenous sphere, which imply that the heterogeneity and non-spherical shape in algal cell morphology and internal structure have little effect on the inherent association among them.