Depth profiles of iodide and iodate during POLARSTERN cruise ANT-XXIV/3 to the Atlantic sector of the Southern Ocean ...

• Main Authors: Bluhm, Katrin, Croot, Peter L, Huhn, Oliver, Rohardt, Gerd, Lochte, Karin
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: AWI; Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES; International Polar Year 2007-2008 IPY; Physical Oceanography @ AWI AWI_PhyOce; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Drake Passage; International Polar Year; IPY; Phytoplankton; Sea ice; Southern Ocean; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.847052; https://doi.pangaea.de/10.1594/PANGAEA.847052

The biogeochemistry of iodine in the waters of the Atlantic sector of the Southern Ocean was investigated during the Polarstern cruise ANTXXIV-3 ZERO&DRAKE. The speciation and distribution of iodine (iodate and iodide) in seawater was examined across gradients of iron concentrations and phytoplankton abundance, ranging from an open ocean region along the Zero Meridian to the Weddell Sea and Drake Passage. Iodine cycling in high latitudes differs from that in low latitudes due to differences in the plankton community composition and the physicochemical characteristics. Iodate concentrations ranged between 400 and 450 nmol/L from the surface to the bottom. Surface concentrations of iodide (17 to over 60 nmol/L) were about an order of magnitude higher than below the pycnocline. The peak values of iodide lay nearly always within the euphotic zone and showed a weak, positive correlation with nitrite concentrations in the upper 200 m. In all vertical profiles a pronounced sub-surface maximum in iodide appears ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...