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Development and validation of a MODIS colored dissolved organic matter (CDOM) algorithm in northwest Florida estuaries
Citation:
Duffy, A., B. Schaeffer, R. Conmy, J. Aukamp, G. Craven, AND D. Yates. Development and validation of a MODIS colored dissolved organic matter (CDOM) algorithm in northwest Florida estuaries. Presented at Gulf Estuarine Research Society Conference, November 08 - 09, 2012.
Impact/Purpose:
The objective of the study being presented was to develop and validate a MODIS CDOM algorithm for northwest Florida estuaries
Description:
Satellite remote sensing provides synoptic and frequent monitoring of water quality parameters that aids in determining the health of aquatic ecosystems and the development of effective management strategies. Northwest Florida estuaries are classified as optically-complex, or waters influenced by chlorophyll-a, colored dissolved organic matter (CDOM), suspended solids, and bottom reflectance. A CDOM algorithm for the Moderate-Resolution Imaging Spectroradiometer (MODIS) satellite was first developed for northwest Florida estuaries using above-water measures of remote sensing reflectance [Rrs()0+] from a Hyperspectral Surface Acquisition System (HyperSAS). The algorithm was then calibrated and validated with discrete surface water samples from four estuaries. Match-ups between in situ measurements of CDOM absorption coefficients at 412 nm (aCDOM(412)) with that derived from atmospherically corrected MODIS data were examined using the band ratio Rrs(488)/Rrs(667). Derived CDOM absorption values could further be used as a proxy to estimate surface salinity and dissolved organic carbon (DOC).