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 |
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| Authors: | V I Man'kovsky |
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| Institution: | (1) Estonian Marine Institute, University of Tartu, M?ealuse St. 10A, 12618 Tallinn, Estonia;(2) Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61101 Rannu, Tartumaa, Estonia;(3) European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy |
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| Abstract: | 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.
Translated by Peter V. Malyshev and Dmitry V. Malyshev |
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