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Light attenuation in waters of the Oder River and Pomeranian Bay

Seasonal changes of values of light attenuation coefficient in Oder River and in coastal waters of Pomeranian Bay (Poland) are presented. Modified theoretical junction approximating very well spectra of light attenuation coefficient for these waters is applied. The approximate formula based on Mie theory for light attenuation coefficient can be applied for examination of degree and kind of contamination in natural water areas. Spectral distributions of light attenuation coefficient are related to concentration of optically active water coinponents. The light attenuation coefficient determines efficiency of transport of radiation in water, under-water visibility conditions and also serves as an indicator of contaminations. The spectrum of light attenuation coefficient characterizes and differentiates waters in different areas.