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2 Oceanologia

2 1999

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Modified relationships between the occurrence of photoprotecting carotenoids of phytoplankton and Potentially Destructive Radiation in the sea [commun.]

Majchrowski R., Ostrowska M.

Oceanologia

1999

No. 41 (4)

589-599

The paper analyses the statistical relationships between photoprotecting pigment concentrations (principally selected groups of carotenoids), chlorophyll a concentrations and absolute values of the natural irradiance in the sea. The data from 404 sites in various regions (the authors' own investigations and data available on the Internet - about 3000 data sets altogether) were examined. This analysis confirms the close relationships between the occurrence of photoprotecting pigments and irradiance at short waves in the PAR range (λ< 480 nm). Modified statistical relationships between the relative concentration of photoprotecting pigments (ratio of photoprotecting pigments to total chlorophyll a concentration) and the Potentially Destructive Radiation (PDR*) have therefore been elaborated. The latter is the quantity of irradiance from the short-wave PAR range absorbed per chlorophyll a mass unit.

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.