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Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event

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Abstract

The distributions of iodate and total inorganic iodine concentrations in the waters on the Texas–Louisiana shelf in April, June, and August 2004 are described. Iodine–salinity graphs show three-end-member mixing involving onshore and offshore surface waters and deep offshore water. The April survey showed simple mixing on the surface, but in the later surveys, iodate concentrations were often much lower than predicted by the mixing curve while those for total inorganic iodine were higher. This demonstrated both iodate reduction in the water and iodide addition, although individual samples did not show equivalent speciation changes. Hydrographically, the system consists of the estuaries of the Mississippi and Atchafalaya rivers as they spill onto the shelf. The waters are stratified seasonally by a robust halocline, leading to hypoxia in the bottom waters from the combined effect of restricted downward diffusion of oxygen and the sinking of the luxuriant growth of phytoplankton induced by riverine nutrient supply. The distributions of iodate and total inorganic iodine are, therefore, interpreted in terms of water–sediment interaction as the shelf shoals to the north.

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Acknowledgments

The data used in this study were collected as part of the National Oceanic and Atmospheric Administration-funded NGOMEX program Mechanisms Controlling Hypoxia. We are grateful to Steven DiMarco (co-chief scientist with PC on these cruises) for the hydrographic data, and to the Captain and crew of the R.V. Gyre and our many students and colleagues who made up the cruise parties. Further information on the data sets may be obtained from the authors. We also thank our two reviewers for their comments on an earlier version of this manuscript; these have helped improve the discussion. This is NGOMEX contribution #134.

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  1. Department of Oceanography, Texas A&M University, College Station, TX, 77843, USA

    Piers Chapman

  2. School of Life Sciences, Oxford-Brookes University, Headington, Oxford, OX3 0BP, UK

    Victor W. Truesdale

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Chapman, P., Truesdale, V.W. Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event. Aquat Geochem 17, 671–695 (2011). https://doi.org/10.1007/s10498-011-9123-6

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