Articles | Volume 15, issue 14
https://doi.org/10.5194/bg-15-4647-2018
https://doi.org/10.5194/bg-15-4647-2018
Research article
 | 
30 Jul 2018
Research article |  | 30 Jul 2018

Seasonal development of iron limitation in the sub-Antarctic zone

Thomas J. Ryan-Keogh, Sandy J. Thomalla, Thato N. Mtshali, Natasha R. van Horsten, and Hazel J. Little

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Cited articles

Behrenfeld, M. J., Worthington, K., Sherrell, R. M., Chavez, F. P., Strutton, P., McPhaden, M., and Shea, D. M.: Controls on tropical Pacific Ocean productivity revealed through nutrient stress diagnostics, Nature, 442, 1025–1028, https://doi.org/10.1038/nature05083, 2006. 
Behrenfeld, M. J., O'Malley, R. T., Boss, E. S., Westberry, T. K., Graff, J. R., Halsey, K. H., Milligan, A. J., Siegel, D. A., and Brown, M. B.: Reevaluating ocean warming impacts on global phytoplankton, Nat. Clim. Change, 6, 323–330, https://doi.org/10.1038/nclimate2838, 2016. 
Bellacicco, M., Volpe, G., Colella, S., Pitarch, J., and Santoleri, R.: Influence of photoacclimation on the phytoplankton seasonal cycle in the Mediterranean Sea as seen by satellite, Remote Sens. Environ., 184, 595–604, https://doi.org/10.1016/j.rse.2016.08.004, 2016. 
Bopp, L., Aumont, O., Cadule, P., Alvain, S., and Gehlen, M.: Response of diatoms distribution to global warming and potential implications: A global model study, Geophys. Res. Lett., 32, L19606, https://doi.org/10.1029/2005GL023653, 2005. 
Boyd, P. W.: Environmental factors controlling phytoplankton processes in the Southern Ocean, J. Phycol., 38, 844–861, https://doi.org/10.1046/j.1529-8817.2002.t01-1-01203.x, 2002. 
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Short summary
The availability of iron in the Southern Ocean constrains the overall extent and magnitude of the phytoplankton bloom. Uncertainty remains over the dominant supply mechanisms, which are expected to be altered by climate change. Nutrient addition experiments confirm that iron limitation is seasonal in nature, with increased responses to iron addition in late summer. This is driven by variability in the supply mechanisms across the growing season, which fail to meet the phytoplankton demand.
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