This data set was acquired with a Sea-Bird Electronics SBE-911+ CTD during R/V Nathaniel B. Palmer expedition NBP1608 conducted in 2016 (Chief Scientist: Dr. Bethany Jenkins, Investigator: Dr. Bethany Jenkins). These data files are of Sea-Bird CTD format and include Conductivity, Pressure and Temperature data that were processed. Data were acquired as part of the project(s): Collaborative Research: Investigating Iron-inding Ligands in Southern Ocean Diatom Communities: The Role of Diatom-Bacteria Associations. Funding was provided by NSF award(s): OPP14-43474.