19 August 2009 Evaluation of solar stimulated CDOM fluorescence and its impact on the closure of remote sensing reflectance
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Abstract
As a result of rich nutrient and terrestrial influence dissolved organic matter plays an important role in determining the optical properties of coastal water. Despite the fact that the features of its fluorescence spectroscopy depend on its complicated chemical components, which are source specific, estimation of solar stimulated CDOM fluorescence is usually based on a fixed Gaussian spectral shape or a modeled fluorescence transfer function obtained from extracted fuvic and humic acid. The excitation emission matrix (EEM) and absorption spectrum of CDOM extracted from seawater in various coastal zones are measured using Perkin Elmer fluorescence spectrometer. Unlike previous research, the obtained EEM spectroscopy data after calibration are then entered into the Hydrolight radiative transfer program together with the data of inherent optical properties such as absorption and attenuation simultaneously collected by Wetlabs in-situ instrument package to evaluate realistically the contribution of solar stimulated CDOM fluorescence to the total reflectance in the Hudson River and New York City area. In addition, the CDOM contribution to the total reflectance is evaluated with the presence of other water components based on a depth integrated fluorescence model and a semi-analytical reflectance model. The simulated remote sensing reflectance with the CDOM fluorescence on and off are compared with the field recorded spectra, through which its impact on the closure of ocean color data as well as on the accuracy of estimating backscattering ratio and chlorophyll fluorescence is also assessed.
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J. Zhou, J. Zhou, A. Tonizzo, A. Tonizzo, I. Ioannou, I. Ioannou, S. Hlaing, S. Hlaing, A. Gilerson, A. Gilerson, B. Gross, B. Gross, F. Moshary, F. Moshary, S. Ahmed, S. Ahmed, } "Evaluation of solar stimulated CDOM fluorescence and its impact on the closure of remote sensing reflectance", Proc. SPIE 7459, Ocean Remote Sensing: Methods and Applications, 74590B (19 August 2009); doi: 10.1117/12.825374; https://doi.org/10.1117/12.825374
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