Variability of Bio-Optical Characteristics of Surface Water Layer during Transatlantic Transect in 2019–2020

Areas with different values of the bio-optical characteristics of the surface water layer and different temperature and salinity distributions obtained during a Transatlantic transect in winter 2019/2020 are studied. In the region of Canary Upwelling and the equator, the temperature decrease zones c...

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Bibliographic Details
Published in:Oceanology (Washington. 1965) 2021-11, Vol.61 (6), p.872-880
Main Authors: Glukhovets, D. I., Salyuk, P. A., Artemiev, V. A., Shtraikhert, E. A., Zakharkov, S. P.
Format: Article
Language:English
Subjects:
Absorptivity
Attenuation
Chlorophyll
Chlorophyll a
Coefficients
Colour
Correlation
Dissolved organic matter
Earth and Environmental Science
Earth Sciences
Equator
Equatorial regions
Fluorescence
Fronts
Light intensity
Marine Physics
Ocean circulation
Oceanography
Oligotrophic waters
Optical properties
Photodegradation
River discharge
River flow
Runoff
Salinity
Salinity effects
Surface water
Temperature effects
Tropical climate
Upwelling
Web services
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Summary:Areas with different values of the bio-optical characteristics of the surface water layer and different temperature and salinity distributions obtained during a Transatlantic transect in winter 2019/2020 are studied. In the region of Canary Upwelling and the equator, the temperature decrease zones correspond to peaks of fluorescence intensity of chlorophyll and colored dissolved organic matter (CDOM). The fluorescence intensities concurrently varied in the both channels. In the surface water of the tropical and subtropical Atlantic, low values of the chlorophyll and CDOM fluorescence intensities and the attenuation and absorption coefficients, which are characteristic of oligotrophic waters, were recorded. These distributions mostly agree well with the NOAA web service, created in late 2019 and providing interpolated satellite maps of chlorophyll a concentration. En route to La Plata Bay, a series of fronts were recorded, as well as a strong negative correlation between the CDOM fluorescence intensity and salinity (ρ = –0.97), caused by river runoff. In contrast to a similar negative correlation studied earlier in the Kara Sea, CDOM photodegradation under the action of high-intensity sunlight was observed.
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437021060229