Fluorescence quantum yield of CDOM in coastal zones of the Arctic seas

Drozdova, A. N.; Кравчишина, М. Д.; Khundzhua, Daria; Freidkin, Mihail P.; Patsaeva, Svetlana V.

doi:10.1080/01431161.2018.1506187

Cited by 15 publications

(12 citation statements)

References 71 publications

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“…Our study of the fluorescent fraction of DOM has revealed the dominant role of HS in the delta area of the Northern Dvina River and across the Laptev Sea shelf up to station 5225, which is located in the slope region. This conclusion agrees with the results on DOM absorption properties (Drozdova et al, ) and hydrochemical structure of Laptev Sea waters (Stepanova et al, ). The removal of a significant part of HS was demonstrated during field experiments performed in 2015 in the Laptev and White Seas.…”

Section: Discussionsupporting

confidence: 93%

Organic Matter and Mineral Interactions Modulate Flocculation Across Arctic River Mixing Zones

et al. 2019

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The focus of this study is organic matter changes and suspended particle and colloid behavior in riverine and marine water mixing zones. Laboratory experiments demonstrated that salinity, clay mineral type, and the nature of dissolved organic matter (DOM) have a strong influence on mineral suspension stabilities (clays, carbonates, and ferric hydroxide), which represent the main fractions of particulate and colloidal matter riverine export. Clay mineral modification by humic acids stabilizes suspensions under increasing salinity, resulting in greater export of particles to coastal zones. Simultaneously, modified particles are more efficiently aggregated by a flocculant than nonmodified particles. Field investigations were conducted in Arctic river mixing zones, providing new information about colloid matter and colloid organic carbon distributions in the mixing zones, which agreed well with laboratory studies. The ratio between colloid organic carbon and suspended matter may prove a useful criterion to distinguish effective flocculation zones. Arctic River DOM fluorescence suggests dominance of terrigenous humic substances in mixing zones as well as coprecipitation by coagulation and flocculation. Our findings may reconcile reports of nonconservative behavior of DOM previously reported in the mixing zone at salinities of less than 12. We suggest that there is a flocculation mechanism in the estuarine mixing zone, which implies the presence of natural active substances, released during microorganism viral lysis (viral shunting).

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Section: Discussionsupporting

confidence: 93%

Organic Matter and Mineral Interactions Modulate Flocculation Across Arctic River Mixing Zones

et al. 2019

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“…The value of SUVA < 1.8 is an evidence of algae and bacteria CDOM predominance, and SUVA >3 suggests the terrestrial CDOM origin. Spectroscopic indices are given in our recent studies [32,41].…”

Section: Optical Measurements and Spectroscopic Indicesmentioning

confidence: 99%

CDOM Optical Properties and DOC Content in the Largest Mixing Zones of the Siberian Shelf Seas

et al. 2021

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Notable changes in the Arctic ecosystem driven by increased atmospheric temperature and ice cover reduction were observed in the last decades. Ongoing environmental shifts affect freshwater discharge to the Arctic Ocean, and alter Arctic land-ocean fluxes. The monitoring of DOC distribution and CDOM optical properties is of great interest both from the point of view of validation of remote sensing models, and for studying organic carbon transformation and dynamics. In this study we report the DOC concentrations and CDOM optical characteristics in the mixing zones of the Ob, Yenisei, Khatanga, Lena, Kolyma, and Indigirka rivers. Water sampling was performed in August–October 2015 and 2017. The DOC was determined by high-temperature combustion, and absorption coefficients and spectroscopic indices were calculated using the seawater absorbance obtained with spectrophotometric measurements. Kara and Laptev mixing zones were characterized by conservative DOC behavior, while the East Siberian sea waters showed nonconservative DOC distribution. Dominant DOM sources are discussed. The absorption coefficient aCDOM (350) in the East Siberian Sea was two-fold lower compared to Kara and Laptev seawaters. For the first time we report the DOC content in the Khatanga River of 802.6 µM based on the DOC in the Khatanga estuary.

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“…However, the major limitation to the remote sensing of relevant environmental parameters of the coastal regions is still insufficient knowledge of the relations between remote sensing estimates of apparent optical properties and Inherent Optical Properties (IOPs) of the sea water. The paper by Drozdova et al (2018) contributes to the characterization of the spectral absorption and backscattering coefficients for marine water column constituents, focusing on coloured dissolved organic matter (CDOM) in the Arctic shelf waters affected by freshwater runoff, using optical indices calculated from absorption and fluorescence spectra, and by applying CDOM fluorescence quantum yield as a function of excitation wavelength. Optical properties of the ocean coastal waters can also be used to infer information on sea bottom vegetation.…”

Section: Prefacementioning

confidence: 99%