............................................................................. 48 3.1 The Alfred Wegener Institute and the PHYTOOPTICS group.................................. 48 3.2 Polymer and OC-PFT [...] data used as y and the OLCI data used as xb originate. 48 3. Methods and instruments 3.1 The Alfred Wegener Institute and the PHYTOOPTICS group The entire process aimed at acquiring the necessary knowledge [...] took place in Bremerhaven, Germany, at the offices owned by the PHYTOOPTICS group of the Alfred-Wegener-Institut Helmholtz-Zentrum für polar und meeresforschung. The institute, whose name is commonly shortened