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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, V. 22, No. 5, pp. 38-50

Bio-optical algorithms for restoring chlorophyll a concentration in the Volgograd Reservoir using Sentinel-3 OLCI images

S.V. Fedorov 1, 2 , A.A. Molkov 1, 3, 4 , I.A. Kapustin 1, 3, 4 , A.V. Ermoshkin 1, 3 , G.V. Leshev 1, 3 , D.V. Dobrokhotova 1, 3 , E.S. Koltsova 1 , B.V. Konovalov 1, 5 , A.M. Chushnyakova 1, 5 
1 Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
2 Marine Hydrophysical Institute RAS, Sevastopol, Russia
3 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
4 Volga State University of Water Transport, Nizhny Novgorod, Russia
5 Shirshov Institute of Oceanology RAS, Moscow, Russia
Accepted: 29.07.2025
DOI: 10.21046/2070-7401-2025-22-5-38-50
Inland water bodies, including reservoirs, are optically complex environments for which standard satellite algorithms for estimating chlorophyll a concentrations are of little use without adaptation and validation. In this work, a full cycle of analysis is implemented: from field measurements and validation of various algorithms of atmospheric correction to calibration of bio-optical algorithms adapted to the Volgograd Reservoir. In 2024, two expeditions were carried out at this reservoir to collect field data, including measurements of water reflectance, chlorophyll a concentration and atmospheric transparency. Significant spatial and temporal variability of optical properties of waters was found, which was reflected in the spectra of remote sensing reflectance and concentrations of optically active components of water. Validation of atmospheric correction of Sentinel-3 OLCI images showed a fairly high accuracy of satellite remote sensing reflectance. The correlation coefficient was 0.9–1 for most spectral bands. Some deterioration in accuracy was observed in the blue region of the spectrum. The correlation coefficient was approximately 0.7. A comparison of estimates of chlorophyll a concentration according to the NASA OC4 algorithm with measurements of this parameter showed their low accuracy. Two-band red-edge algorithms are proposed for restoring chlorophyll a concentration with a coefficient of determination of 0.7–0.8.
Keywords: Volgograd Reservoir, field measurements, atmospheric correction, Sentinel-3 OLCI, bio-optical algorithms, chlorophyll a concentration
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