Preliminary results of an algorithm to determine the total absorption coefficient of water
DRS at CSIR-National Institute of Oceanography
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Title |
Preliminary results of an algorithm to determine the total absorption coefficient of water
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Creator |
Suresh, T.
Talaulikar, M. Desa, E.J. Lotlikar, A. |
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Subject |
CHEMISTRY AND BIOGEOCHEMISTRY
OCEANOGRAPHY AND LIMNOLOGY OCEANOGRAPHIC SUPPORT SERVICES OCEANOGRAPHY AND LIMNOLOGY |
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Description |
An algorithm to determine the spectral total absorption coefficient of water is presented. The algorithm is based on the Gershun’s equation of alfa = micro KE. The spectral underwater average cosine, micro and vertical attenuation coefficient of net irradiance, KE were obtained from radiative transfer simulations using Hydrolight with large in-situ measured data from the coastal and estuarine waters of Goa. A refined algorithm of spectral micro as in Ref. [1] is used to determine the spectral underwater average cosine. The spectral KE was related to the diffuse attenuation coefficient, Kd. The algorithms to derive absorption were validated using an independent NOMAD optical data at wavelengths 412, 440, 488, 510, 532, 555, 650 and 676 nm. The performance of the algorithm was evident from the high R2, low bias and low RMSE. The values of R2 at wavelengths 412, 440, 488, 510, 532, 555, 650 and 676 nm were 0.95, 0.95, 0.93, 0.93, 0.88, 0.82, 0.62, and 0.65 respectively. The corresponding bias were -0.0064, 0.0076, 0.0038, 0.0044, 0.0122, 0.0124, 0.0362, and 0.0093 respectively. The algorithms for micro and KE provide the spectral weighted average within Z90 and have the advantage of deriving the absorption coefficients from the satellite data
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Date |
2016-07-11T11:43:04Z
2016-07-11T11:43:04Z 2016 |
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Type |
Conference Article
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Identifier |
Proceedings of SPIE, vol. 9878, Remote Sensing of the Oceans and Inland Waters: Techniques, Applications, and Challengeses, 98780E; 2016; 8pp doi.: 10.1117/12.2235777
http://drs.nio.org/drs/handle/2264/4994 |
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Language |
en
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Rights |
Copyright [2016]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
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Publisher |
Society of Photo-Optical Instrumentation Engineers
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