Optical properties of humic substances in the coastal waters of the White Sea based on the results of 2020 expeditions

Zhiltsova, A.A.; Krasnova, E.D.; Voronov, D.A.; Trubetskaya, O.E.; Trubetskoj, O.A.; Khundzhua, D.A.; Patsaeva, S.V.

Авторы: Zhiltsova Anna A., Krasnova Elena D., Voronov D.A., Trubetskaya Olga E., Trubetskoj Oleg A., Khundzhua Daria A., Patsaeva Svetlana V.
Журнал: Proceedings of SPIE - The International Society for Optical Engineering
Том: 11845
Год издания: 2021
Издательство: SPIE, the International Society for Optical Engineering
Местоположение издательства: Bellingham, WA, United States
Номер статьи: 118450G
DOI: 10.1117/12.2590917
Аннотация: Aquatic humic substances, or chromophoric fraction of dissolved organic matter (СDOM) in natural water have characteristic optical properties. Considerable effort has been devoted to investigate CDOM optical properties and to improve understanding of biogeochemical carbon cycles in the northern regions. However, due to rare observations up to date there is a limited amount of data available on CDOM research in the sub-Arctic zones. This work summarizes the spectral-optical properties of CDOM from several locations along two coasts of the White Sea. The absorption and fluorescence emission spectra with different excitation wavelength were measured for water sampled in August- September 2020 in the expeditions to several locations of the Karelian and Tersky Coasts, differing in geomorphology, hydrology and anthropogenic influence. The fluorescence was found excitation-dependent; we observed the “blue shift” of emission maximum along with rising the excitation wavelength for all studied CDOM samples (surface and deep coastal water). The absorption spectra are similar in shape for all studied CDOM samples, however, absorbance values reflect concentration of humic substances in some samples. In the Lobanikha Bay we did not find the significant difference in deep and surface CDOM, but in the relict lagoon in Eastern Porya Bay the CDOM was concentrated towards bottom. Those findings are important for understanding the mechanisms of the formation of optical properties of natural water with CDOM of various origins.
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Optical properties of humic substances in the coastal waters of the White Sea based on the results of 2020 expeditionsстатья

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