Unveiling the Si cycle using isotopes in an iron-fertilized zone of the
Southern Ocean: from mixed-layer supply to export

Closset, Ivia; Cardinal, Damien; Rembauville, Mathieu; Thil, François; Blain, Stéphane

doi:https://doi.org/10.5194/bg-13-6049-2016

Articles | Volume 13, issue 21

https://doi.org/10.5194/bg-13-6049-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/bg-13-6049-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 13, issue 21

Research article

|

03 Nov 2016

Research article |

| 03 Nov 2016

Unveiling the Si cycle using isotopes in an iron-fertilized zone of the Southern Ocean: from mixed-layer supply to export

Ivia Closset, Damien Cardinal, Mathieu Rembauville, François Thil, and Stéphane Blain

Supplement

https://doi.org/10.5194/bg-13-6049-2016-supplement

Data sets

Si isotopes data GEOTRACES International Data Assembly Centre http://www.bodc.ac.uk/geotraces/

Moreover all KEOPS-2 data French CYBER Data Centre http://keops2.obs-vlfr.fr/

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Short summary

Isotopic measurements were used to investigate the seasonal evolution of the silicon (Si) biogeochemical cycle in a naturally iron-fertilized area of the Southern Ocean. When comparing data from early spring and summer periods, the relationship between Si depletion, biogenic silica production, and their isotopic composition appears decoupled in this region. Considering these results, we refined the seasonal net Si production that was mainly sustained by surface phytoplankton populations.