Forel-Ule indices from optical measurements collected during the North Sea Coast Harmful Algal Bloom (NORCOHAB II) HEINCKE cruise HE302

Remote sensing reflectance information was validated using the automated using Garaba et al. (2011, doi:10.5194/osd-8-613-2011) meteorological and sunglint quality control method. A renewed colourimetric calculation technique (Wernand and van der Woerd, 2010, doi:10.2971/jeos.2010.10014s) based on the contemporary Forel-Ule Scale was then used to convert this remote sensing reflectance information into numerical values. The resulting Forel-Ule Index determined classifies sea water on a scale 1 (indigo-blue, oligotrophic) to 21 (cola brown, hypertrophic).