Calculation of Hue Angle and Inherent Optical Properties of Black Sea and Sea of Azov Water Based on Satellite Color Scanners Data

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Resumo

The study calculates the hue angles of the Black Sea and Sea of Azov water based on satellite and in situ measurements of the reflectance coefficient for 20192023. The correlation coefficient for the satellite and in situ hue angles is 0.92. Division of the reflectance spectra into subgroups according to the values of the hue angle is proposed for the study area. Satellite-derived values of absorption by dissolved organic matter(including detritus absorption) and backscattering by suspended particles have been compared in three ways: by empirical formulas for the hue angle, by a semianalytical algorithm for the spectral reflectance coefficient,and by the standard satellite algorithm (GIOP model). The empirical relationship is better at retrieving the absorption by dissolved organic matter than the standard satellite or semianalytical algorithms whereas for backscattering by suspended particles all three methods show similar quality of retrieving.

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Sobre autores

E. Korchemkina

Marine Hydrophysical Institute of RAS

Autor responsável pela correspondência
Email: korchemkina@mhi-ras.ru
Rússia, Sevastopol

E. Mankovskaya

Marine Hydrophysical Institute of RAS

Email: korchemkina@mhi-ras.ru
Rússia, Sevastopol

Bibliografia

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2. Fig. 1. The layout of the optical stations where measurements were carried out during the flights of the NIS “Professor Vodianitsky" in 2019-2023.

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3. Fig. 2. Chromaticity diagram showing the correspondence of the chromaticity angle α relative to the white (xw, yw) point of the FU (Trout-Ole) scale colors [18, p. 25667].

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4. Fig. 3. Comparison of the values of the chromaticity angle calculated from the data of full–scale measurements of AE (in situ) and from satellite data of Rrs (asatellite); red dots are data from MODIS/Aqua, MODIS/Terra, blue – OLCI/Sentinel-3A, OLCI/Sentinel-3B. Ovals and Roman numerals indicate the subgroups of the QN spectra (a possible intermediate subgroup is indicated by a dashed line). Straight lines are regression lines.

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5. Fig. 4. The average spectra of CR and their standard deviations (shown by shading) for the three subgroups, identified by the angle of chromaticity of the waters.

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6. Fig. 5. Distribution of the values of the chromaticity angle. The sizes of the symbols correspond to the angle range from 80° to 220°, the larger size corresponds to the smaller angle. For example, some values of the chromaticity angles are indicated.

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7. Fig. 6. Comparison of the backscattering indices by suspended particles calculated from field measurements of QW and from satellite Rrs data in three ways: a – according to MODIS/Aqua, MODIS/Terra; b – according to OLCI/Sentinel-3A, OLCI/Sentinel-3B.

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8. Fig. 7. Comparison of absorption rates by dissolved organic matter calculated from field measurements of QW and from satellite Rrs data in three ways: a – according to MODIS/Aqua, MODIS/Terra; b – according to OLCI/Sentinel-3A, OLCI/Sentinel-3B.

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