Relationship between the Optical Properties of Chromophoric Dissolved Organic Matter and Total Concentration of Dissolved Organic Carbon in the Southern Baltic Sea Region

CDOM absorption and fluorescence and DOC measurements were performed during three oceanographic surveys in 1994 in southern Baltic Sea (polish area of the Baltic Proper). 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 the same statistical parameters despite the seasonal change with different hidrographic 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 (DOC lab) varies from 62% (April) to 76% (September) as a contribution of the total DOClab, so implying to be estimated on seasonal basis.

FERRARI Giovanni;  GROSSI Stefania;  TARGA Cristina; 

1996-04-16

JRC13079

https://publications.jrc.ec.europa.eu/repository/handle/JRC13079,