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

Anthony Vodacek; Neil V. Blough

doi:10.1117/12.266432

6 February 1997 Seasonal variation of CDOM in the Middle Atlantic Bight: terrestrial inputs and photooxidation

Anthony Vodacek, Neil V. Blough

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266432
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Surveys of the fluorescence and absorption of chromophore- containing dissolved organic matter (CDOM) were made along a cruise line extending from the mount of Delaware Bay southeast to the Sargasso Sea. With shallow stratification in August, photobleaching dramatically altered the optical properties of the surface waters, with approximately 70 percent of the CDOM absorption and fluorescence lost through photo-oxidation in the waters at the outer shelf. S, the slope of the 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 percent, making the airborne lidar approach for remote determination of CDOM absorption coefficients a robust technique. The photo-oxidation of CDOM in August also affected the relationship between CDOM and DOC, which can be described by a simple model.

Citation Download Citation

Anthony Vodacek and Neil V. Blough "Seasonal variation of CDOM in the Middle Atlantic Bight: terrestrial inputs and photooxidation", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266432

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