We present an experimental model of CDOM solar-stimulated fluorescence. Three-dimensional fluorescence spectra of natural waters were use to determine the solar-stimulated emission as a function of depth in the water column. Inclusion of the wavelength-dependent fluorescence quantum yield provides emission values in absolute units of photons s^-1 cm^-2 5nm^-1. Attenuation of light in the water column was also modeled, allowing determination of total upwelled emission. The upwelled fluorescence is compared to irradiance reflectance calculated from a semianalytical model. The fluorescence contribution to reflectance in the blue-green region can be as high as 70% for blackwater, but is rapidly reduced by the introduction of scattering particles. Except for blackwaters. CDOM fluorescence does not significantly affect irradiance reflectance ratios commonly used in remote-sensing applications. In water with moderate amounts of CDOM (absorption coefficient at 355 nm >/= 0.5 m^-1), fluorescence will dominate water Raman scattering as a secondary influence on the light field in the green spectral region.

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This article may be accessed from the publisher's website (additional fees may apply) at: http://aslo.org/lo/toc/vol_39/issue_1/0001.pdf We thank Frank Hoge for supporting this work and Edward Sheppard for collecting the sample from the Georgia coast. This work was done while A.V. held a National Research Council-NASA resident research associateship. Contribution 8300 from the Woods Hole Oceanographic Institution. Work at Woods Hole was supported by NASA/EOS interdisciplinary investigation (NAGW-243 1) and by the Office of Naval Research (NO00 14-89-J- 1260).ISSN:0024-3590 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

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Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


RIT – Main Campus