Concentrations of dissolved iron (dFe; nmol kg⁻¹) are shown for each station grouped as (A) Trough stations, (B) Shallow Bank stations, (C) Iceberg stations and (D) Ice Shelf stations. The analytical run-to-run precision (± 1 S.D.) of an in-house standard for Ross Sea water is shown as an inset error bar (encircled by dotted line) and is adjusted to the scale of the x-axis of each plot. Vertical dashed line is a visual reference for the approximate concentration of dFe in Winter Water. Enlarged profiles of the upper 100 m (E) are shown to provide details and visual comparison of upper water column profile shapes.