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Optical Closure of Apparent Optical Properties in Coastal Waters off Goa

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Abstract

Inherent and apparent optical properties were measured for coastal waters off Goa, a site on the west coast of India using the in-situ measuring profiling optical instruments. The optical closure was obtained using the radiative transfer model, Hydrolight (Sequoia Inc.). Hydrolight simulations were carried out at all stations using “average particle” Petzold phase function and Fournier Forand phase function with optimum b bp/b p value. The optical properties derived from Hydrolight simulations were then compared with the measured optical properties. The widely used “average particle” phase function measured by Petzold 1972 for coastal waters was found to provide poor results for most of the stations while for few others it was found to produce results comparable to Fournier Forand phase function. The mean percentage deviation for water leaving radiance (remote sensing reflectance) simulated using Petzold and Fournier Forand phase function for wavelength 488 nm varied from 3.8 to 240.7 % (3.8 to 240.8 %) and 1.0 to 48.9 % (1.0 % to 49.0 %) respectively. These closure studies are essential in strengthening the confidence in models or algorithms developed for ocean color remote sensing and also in better understanding of the marine optical properties of waters of the study area.

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Acknowledgments

We are thankful to the Director of National Institute of Oceanography. The study was carried-out under project SATCORE (Satellite Coastal and Oceanographic Research) funded by INCOIS, Hyderabad. Authors are also thankful to the colleagues who rendered their help in measurement of data and preparation of manuscript. The first author also thanks CSIR (Council of Scientific and Industrial Research) for awarding the Senior Research Fellowship (SRF).

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Authors and Affiliations

  1. National Institute of Oceanography, Dona Paula, Goa, 403004, India

    Madhubala Talaulikar, T. Suresh & Elgar Desa

  2. Indian Institute of Technology Bombay, Powai, 400076, India

    Arun Inamdar

Authors
  1. Madhubala Talaulikar
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  2. T. Suresh
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  3. Elgar Desa
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  4. Arun Inamdar
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Correspondence to Madhubala Talaulikar.

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Talaulikar, M., Suresh, T., Desa, E. et al. Optical Closure of Apparent Optical Properties in Coastal Waters off Goa. J Indian Soc Remote Sens 43, 163–171 (2015). https://doi.org/10.1007/s12524-014-0393-5

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  • DOI: https://doi.org/10.1007/s12524-014-0393-5

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