Algorithm deriving chlorophyll in an extremely clear atmosphere using SeaWiFS data

An atmospheric correction algorithm over the ocean in an extremely clear atmospheric condition is proposed. The up-welling radiation from a model atmosphere-ocean was calculated at whole wavelengths of SeaWiFS bands as a function of aerosol optical thickness, instead of two near-infrared bands. First, a best-fit optical thickness is grossly determined using the generated look-up-table of the upwelling radiation. Second, a ratio of radiance at 443 nm to that at 560 nm taken by SeaWiFS was compared with the ratio derived using the LUT, to derive a suitable chlorophyll density