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Discussion papers | Copyright
https://doi.org/10.5194/os-2017-97
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Dec 2017

Research article | 22 Dec 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Ocean Science (OS). The revised manuscript was not accepted.

Seasonal variability of upwelling radiance polarization over the Southern Baltic surface

Włodzimierz Freda Włodzimierz Freda
  • Department of Physics, Gdynia Maritime University, Gdynia, 81-225, Poland

Abstract. Polarization of light may be used to improve the remote colour sensing of sea water. This can be done in a number of ways, such as limiting of sun glints, obtaining information about atmospheric aerosol properties for atmospheric correction as well as improving the interpretation of the water-leaving signal results. However polarization signals at the top of atmosphere (ToA), that include the waterleaving signal, is strongly influenced by atmospheric molecular scattering and by direct sun and sky reflections from sea surface. For these reasons, it is necessary to better understand the factors that change the polarization of light in the atmosphere-ocean system. In this paper, the influence of seasonal variability of inherent optical properties (IOPs), wind speed and solar zenith angle (SZA) on the polarization of upwelling radiance over the sea surface is discussed. The presented results come from Monte Carlo simulations, which used averaged measurements of IOPs, collected for several years, as input data. The effects of simulations are presented in the form of polar plots of the upwelling radiance degree of polarization (DoP). The results indicate that regardless of the wavelength and type of water, the highest value of the above water DoP is strongly correlated with the absorptionto-attenuation ratio. The correlation is a power function and it depends on both the SZA and the wind speed. The correlation versatility for different wavelengths is very unusual in optics of the sea and is therefore worth emphasizing.

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Włodzimierz Freda
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Włodzimierz Freda
Włodzimierz Freda
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The paper presents the results of Monte Carlo simulations of polarization of light over sea surface. These results are presented in form of polar plots that depicts the degree of polarization coming from the bottom hemisphere. The most important conclusion of my paper is that the value of maximum of degree of polarization is corelated with relative absorption coefficient of seawater. Such a correlation do not depend on wavelength or type of water. It depends on wind speed and sun position.
The paper presents the results of Monte Carlo simulations of polarization of light over sea...
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