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

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 phytopla...

Full description

Bibliographic Details
Main Authors: Bluhm, Katrin, Croot, Peter L, Huhn, Oliver, Rohardt, Gerd, Lochte, Karin
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
AWI
AWI_PhyOce
GEOTRACES
Global marine biogeochemical cycles of trace elements and their isotopes
International Polar Year (2007-2008)
IPY
Physical Oceanography @ AWI
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
SPP1158
Arctic
Antarctic
Southern Ocean
Weddell Sea
Drake Passage
Weddell
Antarc*
International Polar Year
Phytoplankton
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.847052
https://doi.org/10.1594/PANGAEA.847052
Description
Summary: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 between 50 and 200 m depth indicating an iodide drawdown at the near surface. Iodide distribution in the Weddell Sea showed elevated levels in Weddell Sea Bottom Water (WSBW) indicating slow oxidation kinetics and the potential for iodide as a tracer of WSBW formation.

Similar Items