Aquatic Sciences Meeting, Albuquerque 2001

CS25 Organic Carbon Dynamics

Date: Wednesday, February 14, 2001, Time: 4:00:00 PM

Location: Acoma/Zuni/Tesuque

Boehme, J, R, College of Marine Science, University of South Florida, St. Petersburg, FL, USA, jboehme@marine.usf.edu

Coble, P, G, College of Marine Science, University of South Florida, St. Petersburg, FL, USA, pcoble@marine.usf.edu

SEASONAL- AND SOURCE-RELATED VARIABILITY IN FLUORESCENCE OF COLORED DISSOLVED ORGANIC MATTER THE TAMPA BAY ESTUARY SYSTEM

The fluorescence of colored dissolved organic matter CDOM, and hence its chemical composition, can vary over large areas, and differences have also been noted in areas influenced by the input of multiple rivers. Efforts to distinguish between various rivers and geographical locations in the Tampa Bay estuary using excitation emission spectroscopy (EEMS) demonstrated that there was statistically significant variability in chemical composition as seen via fluorescence properties of samples, even in such a relatively small region. Unconcentrated water from different sampling locations could be distinguished using the excitation and emission maxima (Exmax, Emmax) of both UV-C and UV-B peaks observed and ratios of UV-C:UV-B fluorescence. In addition, UV-C and UV-B peaks exhibited independent statistical variability in position of Exmax and Emmax by season and region, further supporting the case that the fluorescence of each peak arises from a different mixture of fluorescent components.

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Aquatic Sciences Meeting, Albuquerque 2001

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