The seasonal evolution of colored dissolved organic matter (CDOM), phytoplankton, and non-algal particulate absorption coefficients were measured for the first time along a salinity gradient of the Paranaguá Estuarine Complex (PEC), in southern Brazil. CDOM (mostly of autochthonous origin) inside the estuary exhibited a conservative behavior that dominates the absorption budget at lower wavelengths (∼380 nm). On average, absorption by non-algal particles was more important than absorption by phytoplankton throughout the year and across all wavelengths, except for the maximum absorption band of chlorophyll-a (665–675 nm), where the algal component was predominant year-round. Phytoplankton optical properties were generally consistent with variability in phytoplankton cell counts, particularly during bloom periods. Simultaneously high suspended matter concentrations and low turbidity conditions associated with sampling of mucilaginous materials released by centric diatoms exemplified the complex relationships between biogeochemical and optical properties in this region. The relationship between chlorophyll-a concentration and phytoplankton absorption exhibited seasonal oscillations related to the variation of algal assemblages, ultimately determining the magnitude of the packaging effect. Finally, separation of the signals of these three components in the visible domain is possible only in the near-ultraviolet range (380 nm), associated with CDOM dominance, and at 665 nm where the phytoplankton signature can be isolated.

沿着巴西南部的巴拉那瓜河口综合体（PEC）的盐度梯度，首次测量了有色溶解有机物（CDOM），浮游植物和非藻类颗粒吸收系数的季节性变化。河口内的CDOM（主要是土生土长的）表现出一种保守的行为，在较低波长（约380 nm）下，其吸收预算占主导地位。平均而言，除叶绿素a的最大吸收带外，全年和所有波长下，非藻类颗粒的吸收比浮游植物的吸收更重要。（665–675 nm），藻类成分全年都是主要成分。浮游植物的光学特性通常与浮游植物细胞数的变化一致，特别是在开花期。与由中心硅藻释放的粘质材料的采样相关的同时高悬浮物浓度和低浊度条件说明了该区域生物地球化学和光学性质之间的复杂关系。叶绿素a之间的关系藻类的浓度和浮游植物的吸收表现出与藻类组合变化有关的季节性振荡，最终决定了包装效应的大小。最后，仅在与CDOM优势相关的近紫外线范围（380 nm）以及在665 nm处可以分离出浮游植物标志的情况下，才可能在可见光域中分离这三个成分的信号。