Proceedings PaperEffects Of Water Reflectance At 670 Nm On Coastal Zone Color Scanner (CZCS) Aerosol Radiance Estimates Off The Coast Of Central California
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An algorithm is presented and evaluated for estimating water radiance at 670 nm in CZCS images of highly reflective eddies and other oceanic features in the upwelling region of the California Current System. Such an estimate is necessary for proper atmospheric correction of CZCS images over such water masses. In the present algorithm, the measured signal at 670 nm (less the Rayleigh component) is partitioned between L(670) and L,(670) by iterative adjustment until phytoplankton pigment concentrations calculated with The ratios of water radiances at 443 and 550 nm agree reasonably well with those calculated using the ratio of water radiances at 520 and 550 nm. Optical depths estimated using this algorithm with CZCS data agree well with nearly concurrent in situ measurements, and in an example where apparent aerosol radiance patterns correlate with obviously oceanic features, the algorithm performs well but appears to overestimate Lw(670) slightly .