Surface nutrient concentrations and potential limiting nutrients. Concentrations of surface nitrate (a), orthosilicic acid (b), and phosphate (c) in µmol L^–1. Molar ratios of Si:N (d), Si:P (e), and N:P (f) at the surface. The black dashed lines correspond to the approximate location of the ice edge. The white circles correspond to the stations where the silicon cycle was studied. DOI: https://doi.org/10.1525/elementa.382.f3