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Measurement and estimation of the extinction coefficient in turbid estuarine waters
Authors:DA Pilgrim
Abstract:Measurement of the depth-mean PAR (photosynthetically active radiation) extinction coefficient, ° Ko, is important in the study of estuarine productivity. Measurements of ° Ko, beam attenuation coefficient and Secchi disc depth are presented for the turbid waters of the Tamar Estuary. Equations are formulated which allow good estimates of ° Ko to be determined both from the beam attenuation coefficient (at 660 nm) and from the Secchi disc depth. For comparison, similar data are presented for the clearer waters of the northeast Atlantic.
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