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1 July 2004 A Multicomponent Model of Chromophoric Dissolved Organic Matter Photobleaching
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Abstract

Light absorption by chromophoric dissolved organic matter (CDOM) plays a number of roles in natural waters, including both control of the underwater light field and the initiation of many photochemical reactions. A multicomponent analysis was used to describe the effects of UV and visible radiation on the optical absorption spectra of two natural water samples, a Suwannee River fulvic acid standard (SRFA) and a Delaware Bay water sample. This analysis used a constrained minimization technique to fit independent spectral components to the observed bleaching behavior of the water samples under monochromatic irradiation. Spectra derived from these fits were used to predict the bleaching behavior of both samples under polychromatic irradiation (λ > 320 nm). This approach reproduces the kinetics and spectral behavior of polychromatic photobleaching very well at times <48 h, but underpredicts the bleaching at longer time periods.

Jared V. Goldstone, Rossana Del Vecchio, Neil V. Blough, and Bettina M. Voelker "A Multicomponent Model of Chromophoric Dissolved Organic Matter Photobleaching," Photochemistry and Photobiology 80(1), 52-60, (1 July 2004). https://doi.org/10.1562/TM-03-17.1
Received: 17 October 2003; Accepted: 1 March 2004; Published: 1 July 2004
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