Assessing Uncertainties in Satellite Ocean Color Bio-Optical Properties
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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Uncertainties in retrievals of bio-optical properties from satellite ocean color imagery are related to a variety of factors, including errors associated with sensor calibration and degradation, atmospheric correction, and the bio-optical inversion algorithms. Here we examine the impact of uncertainties in the top-of-atmosphere TOA radiances and coefficients in the quasi-analytical algorithm QAA on the satellite estimation of the normalized water-leaving radiances nLw and downstream bio-optical properties, such as the absorption and backscattering coefficients and chlorophyll. We use a Moderate Resolution Imaging Spectroradiometer MODIS image, free from clouds, covering the Gulf of Mexico, as our data set. We apply ensembles at each pixel in the image to simulate noise on the satellite TOA radiance values randomly-distributed in the range of or - 2.0 at MODIS visible and near-infrared wavelengths. We also use ensembles to analyze sensitivity of coefficients in the QAA algorithm to quantify the impact of uncertainties on absorption and backscattering coefficients.
- Physical and Dynamic Oceanography
- Optical Detection and Detectors
- Atomic and Molecular Physics and Spectroscopy