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|Title:||Comparison of Spectral and Broad-band Models for Computing Photosynthetically Absorbed Radiation in Turbid Waters|
|Authors:||ARST Helgi; ERM Ants; KANGRO Kersti; NOGES Tiina; NOGES PEETER|
|Citation:||BOREAL ENVIRONMENT RESEARCH vol. 11 no. 1 p. 55-65|
|Publisher:||FINNISH ENVIRONMENT INST|
|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 Institute:||Sustainable Resources|
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