Signal of single scattering albedo in water leaving polarization

Piskozub, Jacek; Freda, Włodzimierz

doi:10.2971/jeos.2013.13055

Cited by 6 publications

(10 citation statements)

References 25 publications

(26 reference statements)

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“…Moreover, polarization may be used to separate the inorganic and biogenic parts of suspended matter (see Gilerson et al [8], Chami [9] and Tonizzo et al [10]). It has been shown by Piskozub and Freda [11], that degree of polarization over sea surface strongly depends on single scattering albedo changes caused by various concentrations of bubbles. It is also well known that reflected light is partly polarized, that is why polarization can significantly improve the quality of signal coming from below surface when measured above the seawater.…”

Section: Introductionmentioning

confidence: 99%

Polarization imaging over sea surface - a method for measurements of Stokes components angular distribution

Freda

Piskozub

Toczek

2015

J. Eur. Opt. Soc.-Rapid Publ.

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This article describes a method for determining the angular distribution of light polarization over a roughened surface of the sea. Our method relies on measurements of the Stokes vector elements using a polarization imaging camera that operates using the Division of Focal Plane (DoFP) method. It uses special monochrome CCD array in which the neighbouring cells, instead of recording different colours (red green and blue), are equipped with micropolarizers of four directions (0, 45, 90 and 135 degrees).We combined the camera with a fish-eye lens of Field of View (FoV) > 180 deg. Such a large FoV allowed us to crop out the fragment of the frame along the circular horizon, showing a view covering all directions of the hemisphere. Because of complicated optical design of the fish-eye lens (light refraction on surfaces of parts of the lens) connected to the sensor we checked the accuracy of the measurement system. A method to determine the accuracy of measured polarization is based on comparison of the experimentally obtained rotation matrix with its theoretical form. Such a comparison showed that the maximum error of Stokes vector elements depended on zenith angle and reached as much as 24% for light coming from just above the horizon, but decreased rapidly with decreasing zenith angle to the value of 12% for the angles 10 • off the edge of FoV.Moreover we present the preliminary results prepared over rough sea surface. These results include total intensity of light, Degree of Linear Polarization (DoLP) and their standard deviations. The results have been averaged over one thousand frames of a movie. These results indicate that the maximum polarization is observed near the reflection of the sun, and the signal coming from below the surface may be observed at zenith angles far from the vertical direction.

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Section: Introductionmentioning

confidence: 99%

Polarization imaging over sea surface - a method for measurements of Stokes components angular distribution

Freda

Piskozub

Toczek

2015

J. Eur. Opt. Soc.-Rapid Publ.

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“…CC BY 4.0 License. ongoing numerical radiative transfer models, very few of them include light polarization (Piskozub and Freda, 2013;Chami et al, 2001). Most current methods of radiative transfer treat light as a scalar to hasten the computations.…”

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confidence: 99%

“…Their analysis revealed that the application of the polarization of light in ocean color algorithms might significantly improve the retrieval of hydrosol properties, especially in coastal waters. Piskozub and Freda (2013) applied their polarized radiative transfer model to the Baltic Sea. They examined how scattering properties of seawater represented by a single scattering albedo affected the polarization of water-leaving radiance.…”

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

Freda¹,

Haule²,

Sagan³

2018

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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.

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“…Scattering properties of seawater represented by single scattering albedo that affects the polarization of water-leaving radiance was examined by Piskozub and Freda (2013). They used bubble layers of various concentration to simulate its impact 35 2 Ocean Sci.…”

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confidence: 99%

“…A simulation has been made with Monte Carlo algorithm created by Jacek Piskozub and described in Piskozub and Freda (2013). This version of algorithm not only collects information about various events, in which virtual photons are involved, like reflection, refraction, scattering, absorption or leaving the atmosphere.…”

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Seasonal variability of upwelling radiance polarization over the Southern Baltic surface

Freda

2017

Preprint

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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 water-leaving 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 5 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 10 strongly correlated with the absorption-to-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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Signal of single scattering albedo in water leaving polarization

Cited by 6 publications

References 25 publications

Polarization imaging over sea surface - a method for measurements of Stokes components angular distribution

Polarization imaging over sea surface - a method for measurements of Stokes components angular distribution

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

Seasonal variability of upwelling radiance polarization over the Southern Baltic surface

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