Title: Comparison of Spectral and Broad-band Models for Computing Photosynthetically Absorbed Radiation in Turbid Waters
Citation: BOREAL ENVIRONMENT RESEARCH vol. 11 no. 1 p. 55-65
Publication Year: 2006
JRC N°: JRC33187
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC33187
Type: Articles in periodicals and books
Abstract: A comparison of values of photosynthetically absorbed radiation calculated with spectral and broad-band models was performed. Special attention was paid to turbid lake waters (Secchi depth ranging from 0.3 to 3 m). Ten measurement series of bio-optical characteristics were carried out in June and August 2003 at three Estonian lakes, Peipsi, Võrtsjärv and Harku. Photosynthetically absorbed radiation was calculated from measured quantum irradiance and a radiation model. The results obtained showed that in case of moderately clear waters (Secchi depth about 3 m) it is especially important to use a correct spectral model, as the errors of the broad-band model can be more than 40%–50%. For very turbid waters these errors usually do not exceed 20%. In our measurement results there was a rather remarkable variability of the bio-optical characteristics of the lakes. The relationships between depth-averaged assimilation number and primary production and between depth-integrated primary production and chlorophyll concentration could be described by polynomial functions with intercept = 0.
JRC Directorate:Sustainable Resources

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