Ocean Colour Climate Change Initiative - Approach and initial results. - Shubha Sathyendranath; Bob Brewin; Dagmar Müller; Roland Doerffer; Hajo Krasemann; Frédéric Mélin; Carsten Brockmann; Norman Fomferra; Marco Peters; Mike Grant; François Steinmetz; Pierre-Yves Deschamps; et al. (IGARSS, 2012)