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the analytical development and underlying hypothesis of a three-band algorithm for estimating chlorophyll-a concentration ([chla]) in turbid productive waters are presented. the sensitivity of the algorithm to the spectral location of the bands used is analyzed. a large set of experimental observations ([chla] varied between 4 and 217 mg m 3 and turbidity between 2 and 78 nephelometric turbidity units) was used to calibrate and validate the algorithm. it was found that the variability of the chlorophyll-a fluorescence quantum yield and of the chlorophyll-a specific absorption coefficient can reduce considerably the accuracy of remote predictions of [chla]. instead of parameterizing these interferences, their effects were minimized by tuning the spectral regions used in the algorithm. this allowed us to predict [chla] with a relative root-mean-square error of less than 30%.