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Retrieval of the penetration of light, horizontal and vertical visibility in coastal waters from ocean color remote sensing data

MaƩva Doron(1) , Marcel BABIN(2) , Antoine MANGIN(3) , and Odile FANTON D'ANDON(3)

(1) ACRI-ST/LOV, 260 route du Pin Montard BP 234, 06904 Sophia Antipolis, France
(2) LOV, Quai de la Darse BP 8, 06238 Villefranche sur mer, France
(3) ACRI-ST, 260 route du Pin Montard BP 234, 06904 Sophia Antipolis cedex, France


We present two algorithms for the retrieval of 1) vertical penetration of light and 2) horizontal visibility in coastal waters using ocean color data. The Secchi depth, a proxy to vertical visibility or water transparency, is related to the two former quantities and can be retrieved from the irradiance reflectances. The algorithm development includes the use of classical approximations in marine optics, sensitivity analyses based on radiative transfer calculations, and the use of an extensive in situ optical data set. Finally, match-ups between in situ measurements of the Secchi depth and ocean color data were used for the parameterization of the operational algorithm. Maps of Secchi depths are presented over different coastal regions.


Workshop presentation