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Medium and long term observation of the coastal environment in New Caledonia. Climatic variability in tropical zones. Evolution of the monthly, seasonal and interannual variability of the hydrological and biogeochemical characteristics of marine waters at a point located off the Bay of Dumbéa (N-NW of Noumea, New Caledonia) on a depth of 10m. Measurement of the impact of natural and anthropogenic forcings on the environment, study/quantification of the consequences of this variability, both natural and anthropogenic, on the structuring and functioning of the pelagic ecosystem, and in particular on the appearance of diazotrophic blooms. Validation of the images obtained by different ocean color sensors by monitoring the variations of the "water color" for an adjustment of the algorithms of calculation of the chlorophyll obtained from satellite reflectance. Possible measurements of the impact of the atmospheric plume of the SLN (Société Le Nickel = nickel treatment by pyrometallurgy) following preliminary work.