ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 4, pp. 31-41

Satellite estimation of the coefficients of CDOM absorption and diffuse attenuation in the White and Kara Seas

S.V. Vazyulya1 , O.V. Kopelevich1 , S.V. Sheberstov1 , V.A. Artemiev1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow 117997, Russia
The CDOM absorption coefficient ag is an important optical parameter characterizing seawater light absorption and content of colored organic matter. For most waters, its value makes significant contribution to the diffuse attenuation coefficient Kd, which determines the penetration of solar radiation in the water column. The CDOM absorption significantly affects the spectral values of the remote sensing reflectance Rrs, which determines the possibility of assessment of ag from satellite ocean color data. But a correct satellite estimate of the ag still remains a problem in the first place due to errors of the atmospheric correction in the spectral bands of 412 and 443 nm, where the CDOM absorption is most pronounced.
This paper proposes a modification of the semi-analytical algorithm for solving the inverse problem, which uses the wavelength range ≥488 nm and then the extrapolation of the spectral values of Kd to the short-wave part of the spectrum by using the previously derived system of the basis functions. Development and validation of the algorithm was primarily carried out with data from ship measurements which do not contain errors of the atmospheric correction; the algorithm testing on both the ship and satellite data showed acceptable results.
Keywords: satellite algorithm, colored dissolved organic matter, diffuse attenuation coefficient, White and Kara Seas, validation
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