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- W2022854544 abstract "Water-leaving radiances (Lw) measured from the deck of a ship or boat in oceanic and lake waters are widely and operationally used for satellite sensor vicarious calibration and validation and development of remote-sensing algorithms to understand interdisciplinary coastal ocean properties and processes. However, accurate determination of Lw remains to be a challenging issue because of the limitations of the existing methods to accurately remove the undesired signal (surface-reflected light of the sky and sun) from above-surface measurements of the total upwelling radiance leaving the water surface. In this study, a new theory is developed and applied to the above-surface radiometric data measured from clear, turbid and eutrophic waters. The new method effectively removes surface-reflected contributions from the total upwelling radiance signal under different sky (clear sky to overcast sky) and sun glint conditions. The Lw spectra obtained from the above-surface radiance data using the new method are found to match well with those extrapolated from the upwelling radiances (Lu) measured with another set of underwater radiometers (used just below the sea surface). The new method proves to be a viable alternative, especially in circumstances when the above-surface measurements of radiances are severally contaminated by the surface-reflected light fields. Since spectral radiance measurements are also sensitive to the observation angles, and to the magnitude of the radiometer׳s solid angle field of view, above-surface radiances are also measured for different viewing angles in highly eutrophic waters. Such measurements show large deviations in Lw spectra except at lower viewing angles (30°). When applied to these data, the new method eliminates the undesired signal encountered at higher viewing angles and delivers accurate water-leaving radiance data. These results suggest that the new method is capable of removing the surface-reflected light fields from both time series and discrete radiometric data in a wide range of oceanic, coastal and inland water bodies under different sky and sun glint conditions." @default.
- W2022854544 created "2016-06-24" @default.
- W2022854544 creator A5000075828 @default.
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- W2022854544 date "2014-07-01" @default.
- W2022854544 modified "2023-09-27" @default.
- W2022854544 title "A new theory and its application to remove the effect of surface-reflected light in above-surface radiance data from clear and turbid waters" @default.
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- W2022854544 doi "https://doi.org/10.1016/j.jqsrt.2014.03.021" @default.
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