Retrieval of water optical properties using polarization of light underwater: case I and II waters

Alexander Gilerson; Amir Ibrahim; Robert Foster; Carlos Carrizo; Ahmed El-Habashi; Samir Ahmed

doi:10.1117/12.2067963

14 October 2014 Retrieval of water optical properties using polarization of light underwater: case I and II waters

Alexander Gilerson, Amir Ibrahim, Robert Foster, Carlos Carrizo, Ahmed El-Habashi, Samir Ahmed

Proceedings Volume 9240, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014; 92400R (2014) https://doi.org/10.1117/12.2067963
Event: SPIE Remote Sensing, 2014, Amsterdam, Netherlands

Abstract

The relationship between the degree of linear polarization (DoLP) and attenuation-to-absorption coefficients ratio (c/a) of the water from which the scattering coefficient is readily computed (b = c-a) for two main types of oceanic waters (Case I and II) was investigated using the vector radiative transfer simulation. It is found the for Case I waters that only the green channels of the spectrum can be used to retrieve the scattering coefficient of the water whereas blue and red channels are dominated by the pure water effects of either Rayleigh scattering or high water absorption showing no variability between DoLP and c/a. On the other hand, Case II waters showed a strong relationship between DoLP and c/a for all wavelength of light under study (440, 550, 665 nm). Those relationships have been parameterized for all possible viewing geometries (sensor zenith and azimuth relative to the Sun’s principle plane) and for varying Sun zenith angles. That relationship has been tested and validated against a dataset of in-situ measurements using a custom developed underwater polarimeter that measures the DoLP and an in-water package of instruments (WetLabs ac-s) that measure the absorption and the attenuation coefficients. Another polarimeter fixed on a platform in Long Island Sound at the LISCO station measures the DoLP of the light above water while a moored instrument package (WQM and C-star) that measures in-water optical properties have been used for a time serious validation.

Citation Download Citation

Alexander Gilerson, Amir Ibrahim, Robert Foster, Carlos Carrizo, Ahmed El-Habashi, and Samir Ahmed "Retrieval of water optical properties using polarization of light underwater: case I and II waters", Proc. SPIE 9240, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014, 92400R (14 October 2014); https://doi.org/10.1117/12.2067963

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