Articles | Volume 13, issue 20
https://doi.org/10.5194/bg-13-5697-2016
https://doi.org/10.5194/bg-13-5697-2016
Research article
 | 
17 Oct 2016
Research article |  | 17 Oct 2016

A dissolved cobalt plume in the oxygen minimum zone of the eastern tropical South Pacific

Nicholas J. Hawco, Daniel C. Ohnemus, Joseph A. Resing, Benjamin S. Twining, and Mak A. Saito

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Cited articles

Ahlgren, N. A., Noble, A. E., Patton, A. P., Roache-Johnson, K., Jackson, L., Robinson, D., McKay, C., Moore, L. R., Saito, M. A., and Rocap, G.: The unique trace metal and mixed layer conditions of the Costa Rica upwelling dome support a distinct and dense community of Synechococcus, Limnol. Oceanogr., 59, 2166–2184, https://doi.org/10.4319/lo.2014.59.6.2166, 2014.
Alongi, D. M., Boyle, S. G., Tirendi, F., and Payn, C.: Composition and Behaviour of Trace Metals in Post-oxic Sediments of the Gulf of Papua, Papua New Guinea, Estuar. Coast. Shelf S., 42, 197–211, https://doi.org/10.1006/ecss.1996.0015, 1996.
Baars, O. and Croot, P. L.: Dissolved cobalt speciation and reactivity in the eastern tropical North Atlantic, Mar. Chem., https://doi.org/10.1016/j.marchem.2014.10.006, 2015.
Baxter, L. A., Bobrowski, A., Bond, A. M., Heath, G. A, Paul, R. L., Mrzljak, R., and Zarebski, J.: Electrochemical and spectroscopic investigation of the reduction of dimethylglyoxime at mercury electrodes in the presence of cobalt and nickel, Anal. Chem., 70, 1312–1323, https://doi.org/10.1021/ac9703616, 1998.
Biller, D. V. and Bruland, K. W.: Sources and distributions of Mn, Fe, Co, Ni, Cu, Zn, and Cd relative to macronutrients along the central California coast during the spring and summer upwelling season, Mar. Chem., 155, 50–70, https://doi.org/10.1016/j.marchem.2013.06.003, 2013.
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Short summary
Cobalt is a scarce nutrient required by phytoplankton. We report more than 800 measurements of dissolved cobalt in the South Pacific Ocean, which show high cobalt concentrations in anoxic subsurface waters offshore of Peru. Coastal cobalt sources may be stronger under low oxygen and could fluctuate as climate change is expected to alter the extent of these low-oxygen regions.
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