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Spectral attenuation and irradiance in the laurentian great lakes usa canada

, : Spectral attenuation and irradiance in the laurentian great lakes usa canada. Journal of Great Lakes Research 9(1): 60-68

Optical data collected in 1973-1979 are utilized to study spectral attenuation and irradiance in the midlake waters of 4 Laurentian Great Lakes. Particular attention is given to the photosynthetic available radiation (PAR), its incident spectral distribution, its spectral attenuation, and its qualitative change with depth. Curves are shown illustrating these spectral properties as well as the relationships between PAR and the photosynthetic usable radiation (PUR) for each of the lakes. These curves, along with the included mathematical relationships, enable quantitative estimates of incident PAR, subsurface PAR, and subsurface PUR, and qualitative information to be obtained on subsurface irradiance levels for the Laurentian Great Lakes.

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