Optical algorithms at satellite wavelengths for Total Suspended Matter in tropical coastal waters
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2008-07 | ||||||||
| Language | English | ||||||||
| Author(s) | Ouillon Sylvain1, 2, Douillet Pascal1, 3, Petrenko Anne3, Neveux Jacques4, Dupouy Cecile1, 3, Froidefond Jean-Marie5, Andrefouet Serge1, Munoz-Caravaca Alain6 | ||||||||
| Affiliation(s) | 1 : IRD, Noumea 98848, New Caledonia. 2 : Univ Toulouse, UMR 5566, LEGOS OMP, F-31400 Toulouse, France. 3 : Univ Aix Marseille, Ctr Oceanol Marseille, Lab Oceanog Phys & Biogeochim, F-13288 Marseille, France. 4 : Univ Paris 06, CNRS, UMR 7621, F-66650 Banyuls Sur Mer, France. 5 : Univ Bordeaux, CNRS, UMR 5805, F-33000 Bordeaux, France. 6 : Ctr Estudios Ambientales Cienfuegos, Cienfuegos, Cuba. |
||||||||
| Source | Sensors (1424-8220) (Molecular Diversity Preservation Int), 2008-07 , Vol. 8 , N. 7 , P. 4165-4185 | ||||||||
| DOI | 10.3390/s8074165 | ||||||||
| WOS© Times Cited | 87 | ||||||||
| Keyword(s) | ocean color, remote sensing, sediment transport, suspended matter, turbidity, New Caledonia, Cuba, Fiji | ||||||||
| Abstract | Is it possible to derive accurately Total Suspended Matter concentration or its proxy, turbidity, from remote sensing data in tropical coastal lagoon waters? To investigate this question, hyperspectral remote sensing reflectance, turbidity and chlorophyll pigment concentration were measured in three coral reef lagoons. The three sites enabled us to get data over very diverse environments: oligotrophic and sediment-poor waters in the southwest lagoon of New Caledonia, eutrophic waters in the Cienfuegos Bay (Cuba), and sediment-rich waters in the Laucala Bay (Fiji). In this paper, optical algorithms for turbidity are presented per site based on 113 stations in New Caledonia, 24 stations in Cuba and 56 stations in Fiji. Empirical algorithms are tested at satellite wavebands useful to coastal applications. Global algorithms are also derived for the merged data set (193 stations). The performances of global and local regression algorithms are compared. The best one-band algorithms on all the measurements are obtained at 681 nm using either a polynomial or a power model. The best two-band algorithms are obtained with R412/R620, R443/R670 and R510/R681. Two three-band algorithms based on Rrs620. Rrs681/Rrs412 and Rrs620. Rrs681/Rrs510 also give fair regression statistics. Finally, we propose a global algorithm based on one or three bands: turbidity is first calculated from Rrs681 and then, if < 1 FTU, it is recalculated using an algorithm based on Rrs620. Rrs681/Rrs412. On our data set, this algorithm is suitable for the 0.2-25 FTU turbidity range and for the three sites sampled (mean bias: 3.6 %, rms: 35%, mean quadratic error: 1.4 FTU). This shows that defining global empirical turbidity algorithms in tropical coastal waters is at reach. | ||||||||
| Full Text |
|