Fluorescence of dissolved organic matters of Far-East seas under multifrequence excitation
P.A. Saluk, I.M. Doroshenkov, K.S. Kluger, O.A. Bukin, V.A. Krikun, A.Yu. Maior
Keywords: excitation emission matrix, dissolved organic matter
Abstract
The spatial distribution analysis of parameters characterized fluorescence of dissolved organic matters (DOM) of various types in seawater are presented. Samples were taken in the Japan (East) Sea and in the Sea of Okhotsk in the areas of different nutrient status and in the areas influenced by rivers and/or anthropogenic activity. The measurements were carried out by hyperspectral multiwavelength fluorometer Varian Cary Eclipse immediately after sampling. Spectral ranges of measurements were 230–500 nm for excitation radiation and 240–750 nm for emission radiation. The relationships between fluorescence intensities at different excitation and emission wavelengths were analyzed. The signals of phytoplankton-like, protein-like, humic-like, and anthropogenic fluorescence were identified. The correlation analysis was carried out, explanation of possible DOM origins was done, and the spectral ranges impacted by each fluorescence type were determined.
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