Figure 3
Fram Strait sections (79°N) of (a) salinity, (b) fluorescence (arb. units), (c) fixed N (µM), (d) Si (µM), (e) dFe (nM) and (f) dissolved manganese (nM), (g,h) derived primary and secondary nutrient deficiency (see Eq. (2)). Fixed N (purple), dFe (red), Si (green) and dCo (orange). Black arrows (top panel) indicate the longitudinal positions of the nutrient addition bioassay experiments. The location of the presented section is shown in Fig. 1a. Isohalines (contours) indicate the presence of Polar Surface Waters (S < 31.4, bold) as part of the East Greenland Current (S = 34.8, bold), Intermediate Water (34.8 < S < 35.1) and core Atlantic Water (S > 35.1). Black dots in b-f indicate the sample depths. Figure made using Ocean Data View software based on DIVA gridding calculations (Schlitzer, R., Ocean Data View, version 5.2.1, https://odv.awi.de, 2020) and RTopo-2.0.1 bedrock topography106.
