Fig. 3: Dissolved copper and ligand data for the North Atlantic and South Pacific Oceans.

A Averaged dissolved Cu data for the Pacific and North Atlantic oceans. B Averaged Cu-binding ligand data for the Pacific and North Atlantic oceans collected from available datasets. C Averaged free Cu, log[Cu²⁺], from available datasets for the Pacific and North Atlantic oceans^{5,7,8,12,16,247}.