Changes in the concentration of iron in different size fractions during an iron enrichment experiment in the open Southern Ocean

An in situ iron enrichment experiment was carried out in the Southern Ocean Polar Frontal Zone and fertilized a patch of water within an eddy of the Antarctic Circumpolar Current (EisenEx, Nov. 2000). During the experiment, a physical speciation technique was used for iron analysis in order to understand the changes in iron distribution and size-fractionations, including soluble Fe (0.2 µm), throughout the development of the phytoplankton bloom. Prior to the first infusion of iron, dissolved