Articles | Volume 15, issue 1
https://doi.org/10.5194/bg-15-31-2018
https://doi.org/10.5194/bg-15-31-2018
Research article
 | 
03 Jan 2018
Research article |  | 03 Jan 2018

Distribution of planktonic biogenic carbonate organisms in the Southern Ocean south of Australia: a baseline for ocean acidification impact assessment

Thomas W. Trull, Abraham Passmore, Diana M. Davies, Tim Smit, Kate Berry, and Bronte Tilbrook

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Cited articles

Anthony, K., Kleypas, J. A., and Gattuso, J. P.: Coral reefs modify their seawater carbon chemistry – implications for impacts of ocean acidification, Global Change Biol., 17, 3655–3666, 2011.
Assmy, P., Smetacek, V., Montresor, M., Klaas, C., Henjes, J., Strass, V. H., Arrieta, J. M., Bathmann, U., Berg, G. M., and Breitbarth, E.: Thick-shelled, grazer-protected diatoms decouple ocean carbon and silicon cycles in the iron-limited Antarctic Circumpolar Current, P. Natl. Acad. Sci. USA, 110, 20633–20638, 2013.
Bach, L. T., Riebesell, U., Gutowska, M., Federwisch, L., and Schulz, K. G.: A unifying concept of coccolithophore sensitivity to changing carbonate chemistry embedded in an ecological framework, Prog. Oceanogr., 135, 125–138, 2015.
Balch, W. M. and Utgoff, P. E.: Potential interactions among ocean acidification, coccolithophores, and the optical properties of seawater, Oceanography, 22, 146–159, 2009.
Balch, W. M., Gordon, H. R., Bowler, B. C., Drapeau, D. T., and Booth, E. S.: Calcium carbonate measurements in the surface global ocean based on Moderate-Resolution Imaging Spectroradiometer data, J. Geophys. Res., 110, C07001, https://doi.org/10.1029/2004JC002560, 2005.
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Short summary
We present the first large-scale survey of planktonic biogenic carbonate concentrations south of Australia, accompanied by biogenic silica and particulate organic carbon. These suggest that coccolithophores are largely restricted to subantarctic waters and are present in much lower abundance than in Northern Hemisphere polar waters. Comparison to upper ocean properties suggests that thermal tolerance and competition with diatoms for limiting iron may be as influential as ocean acidification.
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