On the basis of the data of optical investigations performed in the Black Sea, we develop a method for the evaluation of the spectral values of underwater quantum irradiance within the band of photosynthetically active radiation according to the depth of visibility of a Secchi disk and the intensity of illumination of the sea in luxes. The method is based on the use of the correlations between the following optical parameters: of the vertical daylight attenuation factor α with the depth of visibility of a Secchi disk and of the spectral values of α(λ) within the band of photosynthetically active radiation with α(λmin) for sea waters. This method is applicable in the winter-spring period when the seasonal thermocline is absent, the upper layers of the sea are mixed, and the vertical distribution of α is uniform.
Physical Oceanography – Springer Journals
Published: Sep 17, 2006
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