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Relationship between sub-surface diffused reflectance and inherent optical properties in coastal waters

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The optical properties of coastal (case 2) waters off Paradip and off Visakhapatnam, Bay of Bengal, east coast of India are studied. The relationship of diffused reflectance R(0-) with the ratio of backscattering to absorption coefficient (bb/a) and bb/(a+bb) are investigated. Analysis of the bulk data shows that R(0-) varies linearly with bb/a[i.e. R(0-)= f1(bb /a)] with a proportionality constant f1=0.22. Similarly, R(0-) varies linearly with bb/(a+bb) [i.e. R (0-)= f2(bb/(a+bb))] with a proportionality constant f2=0.27. The result indicates that the present empirical relationships can be used for prediction of reflectance spectra in case 2 waters with standard error of estimation ranging from 0.01 to 0.02. The empirical relationship between R(0-) and bb/a obtained in the case 2 waters off Paradip is examined in case 2 waters off Visakhapatnam, Back River and Appomattox River readings. The relationship between solar zentih angle and f1 has been investigated. The results do not show any significant variation of f1 with respect to cosine of solar zenith angle.
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Document Type: Research Article

Publication date: February 20, 2002

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