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Model of the in vivo spectral absorption of algal pigments. Part 1. Mathematical apparatus

Woźniak B., Dera J., Ficek D., Majchrowski R., Kaczmarek S., Ostrowska M., Koblentz-Mishke O. I.

Oceanologia

2000

No. 42 (2)

177-190

Existing statistical models of in vivo light absorption by phytoplankton (Wozniak & Ostrowska 1990, Bricaud et al. 1995, 1998) describe the dependence of the phytoplankton specific spectral absorption coefficient a*pl() on the chlorophyll a concentration Ca in seawater. However, the models do not take into account the variability in this relationship due to phytoplankton acclimation. The observed variability in the light absorption coefficient and its components due to various pigments with depth and geographical position at sea, requires further accurate modelling in order to improve satellite remote sensing algorithms and interpretation of ocean colour maps. The aim of this paper is to formulate an improved model of the phytoplankton spectral absorption capacity which takes account of the pigment composition and absorption changes resulting from photo- and chromatic acclimation processes, and the pigment package effect. It is a synthesis of earlier models and the following statistical generalisations: (1) statistical relationships between various pigment group concentrations and light field properties in the sea (described by Majchrowski & Ostrowska 2000, this volume); (2) a model of light absorption by phytoplankton capable of determining the mathematical relationships between the spectral absorption coefficients of the various photosynthetic and photoprotecting pigment groups, and their concentrations in seawater (Wozniak et al. 1999); (3) bio-optical models of light propagation in oceanic Case 1 Waters and Baltic Case 2 Waters (Wozniak et al. 1992a,b, 1995a,b). The generalised model described in this paper permits the total phytoplankton light absorption coefficient in vivo as well as its components related to the various photosynthetic and photoprotecting pigments to be determined using only the surface irradiance PAR(0+) surface chlorophyll concentration Ca(0) and depth z in the sea as input data.

Modelling the influence of acclimation on the absorption properties of marine phytoplankton

Woźniak B., Dera J., Ficek D., Majchrowski R., Kaczmarek S., Ostrowska M., Koblentz-Mishke O. I.

Oceanologia

1999

No. 41 (2)

187-210

An algorithm for calculating the marine phytoplankton total spectral absorption coefficient and its components for particular groups of photosynthetic and photoprotecting pigments has been developed. The input data for the calculations are the concentrations of these groups of pigments and depth in the sea. Over 1400 sets of simultaneously measured phytoplankton absorption properties and pigment contents at different depths in various water types were applied in the modelling. Photo- and chromatic acclimation as well as the package effect of pigments in cells and its variation in different waters have been considered. The vertical profiles of the product CI d are also described.