Research Papers

Bio-optical properties of the marine cyanobacteria Trichodesmium spp.

[+] Author Affiliations
Ce´cile Dupouy

UR 103 Camelia, Institut de Recherche pour le De´veloppement, Centre d'Oce´anographie de Marseille, Marseille, F-13007 France

Jacques Neveux

Universite´ Pierre et Marie Curie-Paris 06-CNRS (UMR7621), Observatoire Oce´anologique de Banyuls, Banyuls sur mer, 66651 France

Guillaume Dirberg

UR 103 Camelia, Institut de Recherche pour le De´veloppement, BP A5, Noumea, 98848 New Caledonia

Ru¨diger Ro¨ttgers

Institute for Coastal Research, GKSS Research Center, Max-Planck-Str. 1, Geesthacht, D-21502 Germany

Ma´rcio M. Barboza Teno´rio

Laborato´rio de Fitoplaˆncton Marinho, Universidade Santa U´rsula, Rio de Janeiro, RJ 22231-010 Brazil

Sylvain Ouillon

UR 103 Camelia, Institut de Recherche pour le De´veloppement, BP A5, Noumea, 98848 New Caledonia

J. Appl. Remote Sens. 2(1), 023503 (January 10, 2008). doi:10.1117/1.2839036
History: Received July 27, 2007; Revised January 4, 2008; Accepted January 7, 2008; January 10, 2008; Online January 10, 2008
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Abstract

Bio-optical spectral properties were determined on fresh suspensions of Trichodesmium spp. collected in a tropical lagoon and put in seawater tanks (total chlorophyll concentrations range between 0.1 and 3.8 mg m-3>). The spectrum of the backscattering coefficient was a hyperbolic function with a slope of 1.2, often showing troughs at 440, 550 and 676 nm, due to absorption peaks of chlorophyll and phycoerythrin. The absorption spectrum computed with a specific beta correction for Trichodesmium, showed a blue to red ratio (B/R) equivalent to the one of a single colony (B/R=2), and also showed the double peak of mycosporine-like amino acids (MAA's, 330 and 360 nm). The CDOM absorption spectrum showed minor MAA peaks when cyanobacterial concentrations were above 1 mg Chl a m-3>. The chlorophyll a-specific backscattering and absorption coefficients at 442 nm were respectively 0.0126 m2> (mg.chl a)-1> and 0.027 m2> (mg chl a)-1>. Suspensions in tanks exhibited a high backscattering ratio at 660 nm (b˜b>=bbp>/bp>). The above-water reflectance spectrum clearly showed troughs at the wavelength of the pigment absorption peaks. Datasets of Trichodesmium normalized absorption, backscattering and reflectance spectra will allow its detection with future hyperspectral ocean colour sensors.

© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Ce´cile Dupouy ; Jacques Neveux ; Guillaume Dirberg ; Ru¨diger Ro¨ttgers ; Ma´rcio M. Barboza Teno´rio, et al.
"Bio-optical properties of the marine cyanobacteria Trichodesmium spp.", J. Appl. Remote Sens. 2(1), 023503 (January 10, 2008). ; http://dx.doi.org/10.1117/1.2839036


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