Seasonal variation of CDOM in the Middle Atlantic Bight: terrestrial inputs and photooxidation

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Title: Seasonal variation of CDOM in the Middle Atlantic Bight: terrestrial inputs and photooxidation
Author: Vodacek, Anthony; Blough, Neil
Abstract: Surveys of the fluorescence and absorption of chromophore-containing dissolved organic matter (CDOM) were made along a cruise line extending from the mouth of Delaware Bay southeast to the Sargasso Sea. With shallow stratification in August, photobleaching dramatically altered the optical properties ofthe surface waters, with ~70% ofthe CDOM absorption and fluorescence lost through photooxidation in the waters at the outer shelf. S, the slope ofthe log-linearized absorption spectrum of CDOM, increased offshore and appeared to increase with photodegradation. The increase in S underscores the difficulty in developing ocean color algorithms to predict Chl concentrations in highly absorbing coastal waters. The seasonal variation in the CDOM fluorescence-absorption relationship and fluorescence quantum yields was less than 15%, making the airborne lidar approach for remote determination of CDOM absorption coefficients a robust technique. The photooxidation of CDOM in August also affected the relationship between CDOM and DOC, which can be described by a simple model.
Description: RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
Record URI: http://hdl.handle.net/1850/4240
Publishers URL: http://dx.doi.org/10.1117/12.266432
Date: 1997-02

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