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Photoacclimatization in the zooxanthellae of Pocillopora verrucosa and comparison with a pelagic algal community ArchiMer
Maritorena, S; Payri, C; Babin, M; Claustre, H; Bonnafous, L; Morel, A; Rodiere, M.
Photoacclimatization of zooxanthellae extracted from the coral Pocillopora verrucoso was studied through the determination of pigments, light absorption and photosynthetic parameters. for samples collected in summer and winter between 1 and 40 m on a northwestern reef of Tahiti (French Polynesia). The same measurements were also performed on phytoplanktonic samples collected at a stable oceanic site north of the island. For the zooxanthellae, the variations with depth of all the parameters were generally of small amplitude. Seasonal differences were also observed. The photosynthetic to non-photosynthetic pigments ratio was higher at depth in both seasons and was higher in winter. The intracellular concentration of chlorophyll a and photosynthetic pigments...
Tipo: Text Palavras-chave: Zooxanthelles; Photoacclimatation; Pocillopora verrucosa; Phytoplancton; Récifs coralliens; Zooxanthellae; Photoacclimatization; Pocillopora verrucosa; Phytoplankton; Coral reefs.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43313/42941.pdf
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Atmospheric corrections and interpretation of marine radiances in czcs imagery, revisited ArchiMer
Andre, Jm; Morel, A.
In a previous study (Bricaud and Morel, Oceanologica Acta, 1987), a reflectance model developed for oceanic Case 1 waters was introduced into CZCS data processing, mainly with the aim of improving the atmospheric correction scheme and permitting discrimination between Case 1 and turbid Case 2 waters. The present paper, not limited to CZCS, examines the possible extension of the use of this reflectance model. In particular, it is proposed that the relationships required in iterative computations when estimating marine radiances in the four (visible) channels be those which derive from the model rather than the empirical expressions. Also, in order to ensure an internal coherency, it is proposed to operate the modelled relationships between the reflectance...
Tipo: Text Palavras-chave: REMOTE-SENSING; OCEAN COLOR; REFLECTANCE MODEL; PHYTOPLANKTON; AEROSOL.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21260/18871.pdf
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