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Ocean Science An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/os-2017-4
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
13 Mar 2017
Review status
This discussion paper is under review for the journal Ocean Science (OS).
Study on organic matter fractions in the surface micro layer in the Baltic Sea by spectrophotometric and spectrofluorometric methods
Violetta Drozdowska1, Iwona Wróbel1, Piotr Markuszewski1, Przemyslaw Makuch1, Anna Raczkowska2, and Piotr Kowalczuk2 1Physical Oceanography Department, Institute of Oceanology Polish Academy of Science, Sopot, 81-712, Poland
2Marine Physics Department, Institute of Oceanology Polish Academy of Science, Sopot, 81-712, Poland
Abstract. The fluorescence and absorption measurements of the samples collected from a surface microlayer (SML) and a subsurface layer (SS), a depth of 1 m were studied during three research cruises in the Baltic Sea along with hydrophysical studies and meteorological observations. Several absorption (E2 : E3, S, SR) and fluorescence (fluorescence intensities at peaks: A, C, M, T, the ratio (M + T) / (A + C), HIX) indices of colored and fluorescent organic matter (CDOM and FDOM) helped to describe the changes in molecular size and weight as well as in composition of organic matter. The investigation allow to assess a decrease in the contribution of two terrestrial components (A and C) with increasing salinity (~ 1.64 % and ~ 1.89 % in SML and ~ 0.78 % and ~ 0.71 % in SS, respectively) and an increase of in-situ produced components (M and T) with salinity (~ 0.52 % and ~ 2.83 % in SML and ~ 0.98 % and ~ 1.87 % in SS, respectively). Hence, a component T reveals the biggest relative changes along the transect from the Vistula River outlet to Gdansk Deep, both in SML and SS, however an increase was higher in SML than in SS (~ 18.5 % and ~ 12.3 %, respectively). The ratio E2 : E3

Citation: Drozdowska, V., Wróbel, I., Markuszewski, P., Makuch, P., Raczkowska, A., and Kowalczuk, P.: Study on organic matter fractions in the surface micro layer in the Baltic Sea by spectrophotometric and spectrofluorometric methods, Ocean Sci. Discuss., https://doi.org/10.5194/os-2017-4, in review, 2017.
Violetta Drozdowska et al.
Violetta Drozdowska et al.
Violetta Drozdowska et al.

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Short summary
The studies on the absorption and fluorescence properties of the organic molecules included in a surface microlayer (SML) and subsurface (SS) waters confirm that (i) the process of the structural changes in molecules of HMW to LMW, due to effects of photo- and biodegradation, occurs faster in SML than in SS; (ii) the organic molecules contained in SML, have a smaller molecular mass than in SS. Hence, SML can specifically modify the physical processes associated with the sea surface.
The studies on the absorption and fluorescence properties of the organic molecules included in a...
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