Distribution of iodide and iodate in the Atlantic sector of the southern ocean during austral summer.

Bluhm, Katrin, Croot, Peter, Huhn, O., Rohardt, G. and Lochte, K. (2011) Distribution of iodide and iodate in the Atlantic sector of the southern ocean during austral summer. Deep-Sea Research Part II-Topical Studies in Oceanography, 58 (25-26). pp. 2733-2748. DOI 10.1016/j.dsr2.2011.02.002.

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Abstract

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(-1) from the surface to the bottom. Surface concentrations of iodide (17 to over 60 nmol L(-1)) 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. (C) 2011 Elsevier Ltd. All rights reserved.

Document Type: Article
Keywords: Biological Oceanography; Marine chemistry; Marine Biology; Iodide; Iodate; Iodine cycling; Southern Ocean; Weddell Sea; Tracer; WEDDELL SEA ANTARCTICA; EAST CHINA SEA; MARINE-PHYTOPLANKTON; IRON FERTILIZATION; CARBON-DIOXIDE; BOTTOM-WATER; REDOX REACTIONS; NATURAL-WATERS; SURFACE WATERS; DEEP-WATER
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.dsr2.2011.02.002
ISSN: 0967-0645
Projects: GEOTRACES
Expeditions/Models/Experiments:
Date Deposited: 11 Jan 2012 13:02
Last Modified: 24 Sep 2019 00:00
URI: http://oceanrep.geomar.de/id/eprint/13388

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