floats deployed during Polarstern expedition PS 103. Fig. 5. Schematic of mooring array extending from Kapp Norvegia towards the Antarctic Peninsula, deployed during Polarstern expedition PS 103. Moorings [...] presence of Antarctic marine mammals. HAFOS was first implemented to its full extend in 2012/13 during Polarstern expedition ANT-XXIX/2, yet subsets of the system existed in various configurations since 2002, [...] driven instrumentation, need to be exchanged every second to third year during expeditions with RV Polarstern, which also serve to collect spatially highly resolved CTD sections and to deploy additional i