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Discussion papers
https://doi.org/10.5194/os-2018-127
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2018-127
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Nov 2018

Research article | 28 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

On the role of the seawater absorption to attenuation ratio in the radiance polarization above the Southern Baltic surface

Włodzimierz Freda1, Kamila Haule1, and Sławomir Sagan2 Włodzimierz Freda et al.
  • 1Department of Physics, Gdynia Maritime University, Gdynia, 81-225, Poland
  • 2Institute of Oceanology, Polish Academy of Sciences, Sopot, 81-712, Poland

Abstract. Information about polarization of light leaving the ocean surface has the potential to improve the quality of the bio-optical parameters retrieval from ocean color remote sensing (OCRS). This improvement can be applied in numerous ways such as limiting of sun glints and obtaining information about atmospheric aerosol properties for atmospheric correction as well as increasing the accuracy of the algorithms based on the water-leaving signal. Polarization signals at the top of the atmosphere (ToA) that include the water-leaving signal are strongly influenced by atmospheric molecular scattering and by direct sun and sky reflections from the sea surface. For these reasons, it is necessary to better understand the factors that change the polarization of light in the atmosphere-ocean system, especially in coastal zones affected by dynamic changes. In this paper, the influence of seasonal variability of light absorption and scattering coefficients (inherent optical properties, IOPs) of seawater, wind speed and solar zenith angle (SZA) on the polarization of upwelling radiance over the sea surface in the visible light bands is discussed. The results come from a polarized radiative transfer model based on the Monte Carlo code and applied to the atmosphere-ocean system using averaged IOPs as input data. The results, presented in the form of polar plots of the total upwelling radiance degree of polarization (DoP), indicate that regardless of the wavelength of light and type of water, the highest value of the above water DoP is strongly correlated with the absorption-to-attenuation ratio. The correlation is a power function that depends on both the SZA and the wind speed. The correlation versatility for different wavelengths of light is very unusual in optics of the sea and is therefore worth emphasizing.

Włodzimierz Freda et al.
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Short summary
The paper presents a correlation that can potentially improve the signal obtained from ocean color remote sensing. Results come from a modelling applied to the atmosphere-ocean system in different regions of the southern Baltic, two seasons, and two wind speeds, each for nine visible spectral bands. The results show that the variability of the maximum of DoP depends more on seasonal than regional changes and can be explained to a large degree by the seawater absorption-to-attenuation ratio.
The paper presents a correlation that can potentially improve the signal obtained from ocean...
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