Dissolved iron measured along surface transects of the CARUSO-EISENEX experiment ...

• Main Authors: Croot, Peter L, Laan, Patrick, Nishioka, Jun, Strass, Volker H, Cisewski, Boris, Boyé, Marie, Timmermans, Klaas R, Bellerby, Richard G J, Goldson, Laura, Nightingale, Philip D, de Baar, Hein J W
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: Underway cruise track measurements; ANT-XVIII/2; Polarstern; European Iron Enrichment Experiment in the Southern Ocean EisenEx; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Arctic; Antarctic; Southern Ocean; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.701303; https://doi.pangaea.de/10.1594/PANGAEA.701303

Measurements of Fe(II) and H2O2 were carried out in the Atlantic sector of the Southern Ocean during EisenEx, an iron enrichment experiment. Iron was added on three separate occasions, approximately every 8 days, as a ferrous sulfate (FeSO4) solution. Vertical profiles of Fe(II) showed maxima consistent with the plume of the iron infusion. While H2O2 profiles revealed a corresponding minima showing the effect of oxidation of Fe(II) by H2O2, observations showed detectable Fe(II) concentrations existed for up to 8 days after an iron infusion. H2O2 concentrations increased at the depth of the chlorophyll maximum when iron concentrations returned to pre-infusion concentrations (<80 pM) possibly due to biological production related to iron reductase activity.In this work, Fe(II) and dissolved iron were used as tracers themselves for subsequent iron infusions when no further SF6 was added. EisenEx was subject to periods of weak and strong mixing. Slow mixing after the second infusion allowed significant ... : Supplement to: Croot, Peter L; Laan, Patrick; Nishioka, Jun; Strass, Volker H; Cisewski, Boris; Boyé, Marie; Timmermans, Klaas R; Bellerby, Richard G J; Goldson, Laura; Nightingale, Philip D; de Baar, Hein J W (2005): Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mescoscale iron enrichment. Marine Chemistry, 95(1-2), 65-88 ...