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Diurnal variation of the underwater quantum irradiance, the corresponding primary production profiles, and the integral primary production values were estimated by model calculations in three Estonian lakes (Peipsi, Võrtsjärv, and Harku) for 12 days in the summers of 2007 and 2008. In parallel, in situ measurements of primary production were carried out and the main bio-optical parameters of the water were determined. The concordance of the measured and modelled production profiles wasdoi:10.3176/eco.2009.4.05 fatcat:hsgakgrosjehppnqlreafbn3m4