While ocean colour is now more and more used for operational applications (e.g. water quality), the development lags behind other remote sensing methods. This is because it is inherently difficult to retrieve ocean variables accurately and confidently. The potential of ocean colour measurements to calibrate or improve global, regional and coastal biogeochemical models is, however, considerable. The information content is very rich. This is a scientific and technical challenge. We are just beginning to use ocean colour products in ocean models. This is a challenging subject and it should be a high priority research topic for operational oceanography.

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