An experimental model of the solar-stimulated fluorescence of chromophoric dissolved organic matter

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Title: An experimental model of the solar-stimulated fluorescence of chromophoric dissolved organic matter
Author: Vodacek, Anthony; Green, Sarah; Blough, Neil
Abstract: 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.
Description: 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.pdfRIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
Record URI: http://hdl.handle.net/1850/4252
Date: 1994-01

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