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Chromophoric parts of dissolved organic matter (CDOM) absorption and fluorescence and dissolved organic carbon (DOC) measurements were performed during 3 oceanographic surveys in 1994 in the southern Baltic Sea. DOC was measured both by high temperature oxidation (HTCO) and conventional persulphate (LTO) methods. CDOM fluorescence was shown to be highly correlated with absorption with absorption with the same statistical parameters despite the seasonal change with different hydrographic conditions and the quantum yield variations (1.23 +/- 0.07 in April and 0.97 +/- 0.12 in September). The results show a good correlation between the optical parameters and DOC although about 70% of the DOC does not display significant absorption in the UV-visible range (350-750 nm). Although the total non absorbing DOC seems unaffected by seasonal changes, and therefore can be predicted by optical methods using remote sensing techniques, the fraction measured by LTO (labile DOC) varies from 62% (April) to 76% (September) as a contribution of the total labile DOC, so implying the necessity to be estimated on a seasonal basis.

Additional information

Authors: FERRARI G M, JRC Ispra (IT);GROSSI S, JRC Ispra (IT);DOWELL M D, University of Southampton, Department of Oceanography (GB);TARGA C, Università di Venezia, Dipartimento di Scienze Ambientali (IT)
Bibliographic Reference: Article: Marine Chemistry (1996)
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