Fig. 2.

DFe and δ⁵⁶Fe depth profiles. (A−C) Depth profiles of DFe and dissolved nitrate concentration across the three stages of the annual spring phytoplankton bloom. (D−F) The δ⁵⁶Fe results for dissolved, suspended (diamonds), and sinking particulates (upside-down triangles) across the three stages of the phytoplankton bloom. Error bars represent either 2 SDs for multiple sample extraction and isotope separations or 2 SEs of instrument precision for a single sample extraction and isotope separation.