Temperature, salinity and fluorescence data of CTD (Seabird 911+) bottle files (reference to data set doi:10.1594/PANGAEA.784365). Concentrations of nutrients in discrete samples from rosette after filtration of seawater by auto-analyser. Nutrients of samples were measured with a Bran & Luebbe autoanalyzer in the home laboratory in Hamburg by applying standard methods. Nitrate isotope composition (delta15N-nitrate) referenced against air-N2 determined by mass spectrometry after conversion of nitrate to N2O by the denitrifyer method. Methods are detailed in Nagel et al. (2013).