Abstract
To achieve a smooth transition between algorithms for “clear” water and “turbid” water, we propose a single formula to calculate the input parameter () used for empirical retrieval of absorption coefficients () or chlorophyll concentration ([Chl]) from remote-sensing reflectance (). This formula for takes the ratio of the maximum in the blue-green bands to the sum of (green) and the scaled in the red and infrared bands (termed as ). We found that, compared to the widely used OC4-type formula for , can improve the coefficient of determination from to 0.99 for absorption coefficient at 440 nm [] in ([Chl] ). Especially, the sensitivity of to the change in is about five times greater than that of OC4-type for (). These results indicate an advantage of for generating robust and seamless or [Chl] from clear to highly turbid waters. The inclusion of such a scheme in a quasi-analytical algorithm is also presented.
© 2019 Optical Society of America
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