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Modelling the light absorption properties of particulate matter forming organic particles suspended in seawater. Part 1. Model description, classification of organic particles, and example spectra of the light absorption coefficient and the imaginary par

Woźniak B., Woźniak S. B., Tyszka K., Dera J.

Oceanologia

2005

No. 47 (2)

129-164

Data on organic substances in the sea are applied to distinguish hypothetical chemical classes and physical types of suspended particulate organic matter (POM) in seawater. Spectra of the light absorption coefficients of particulate matter apm(?) and the imaginary refractive index n'p(?), are assessed for some of these classes and types of POM in seawater, that is, for live phytoplankton cells and phytoplankton-like particles. The spectral characteristics of these coefficients are established and the probable ranges of variability of their absolute magnitudes defined on the basis of the mass-specific coefficients of light absorption by the various organic substances forming the particles. Also presented are mathematical relationships linking the coefficients apm(?) and n'p(?) for the various chemical classes of POM with their physical parameters, such as the relative contents of organic matter, water, air or some other gas. This article is part of a bio-optical study undertaken by the authors, the objective of which is to implement remote sensing techniques in the investigation of Baltic ecosystems (Woźniak et al. 2004).