Ortiz-Rosa, Suhey

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    Optical properties and photochemical response of colored dissolved organic matter (cdom) at Jobos Bay National Estuarine Research Reserve (JOBANERR), Puerto Rico
    (2010-12) Ortiz-Rosa, Suhey; Corredor, Jorge E.; College of Arts and Sciences - Sciences; Morell, Julio; López, José M.; Aponte, Nilda; Department of Marine Sciences; Gove, Kurt
    The study evaluated the optical properties and dynamics of CDOM in JOBANERR. CDOM absorption coefficient spectrum (aCDOM), Slope (S), excitation emission matrix (EEM) fluorescence and Parallel Factor Analysis (PARAFAC) were used to characterize sources of CDOM. S values varied from 0.014–0.034 nm-1 and aCDOM ranged from 0.11m-1 to 11 m-1. Mar Negro presented a strong terrestrial source of CDOM while Mar Blanco is a transitional area combining terrestrial and marine CDOM sources. Barca presented a strong marine source and it is influenced by terrestrial sources in wet months. Spatial differences were observed between mangrove semi-enclosed areas and open areas of the bay. Significant differences were found on DOC, salinity and slope parameters seasonally between the study sites. Dissolved Organic Carbon (DOC), aCDOM and fluorescence intensity of the main fluorophores (C, M, A, H) were related to salinity, chlorophyll, and UV dose. DOC and aCDOM presented a low correlation (R2 = 0.16). UV dose correlated with aCDOM (Pearson coefficient = -0.98) in an exponential decay. Chlorophyll correlated with aCDOM (Pearson coefficient = 0.73). PARAFAC showed seven components in samples exposed to sunlight described as humic-like, protein-like, degradation or microbial substances. Two principal processes transform CDOM: photodegradation and dilution. The high variability of CDOM signatures in Jobos waters are explained by chemical transformations of CDOM.