Articles | Volume 18, issue 6
https://doi.org/10.5194/bg-18-2205-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-2205-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Mar 2021
Research article |
| 26 Mar 2021
| 26 Mar 2021
On the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralization
Stéphanie H. M. Jacquet
CORRESPONDING AUTHOR
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Dominique Lefèvre
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Christian Tamburini
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Marc Garel
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Frédéric A. C. Le Moigne
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Nagib Bhairy
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
Sophie Guasco
Aix Marseille Université, CNRS/INSU, Université de Toulon,
IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille,
France
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Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But few studies stress the relevance of oceanic advection and diffusion on the downward 234Th fluxes in nearshore environments. Our study in offshore Peru showed strong temporal variations in both the importance of physical processes on 234Th flux estimates and the oceanic residence time of 234Th, whereas salinity-derived seawater 238U activities accounted for up to 40 % errors in 234Th flux estimates.
Alexandra N. Loginova, Andrew W. Dale, Frédéric A. C. Le Moigne, Sören Thomsen, Stefan Sommer, David Clemens, Klaus Wallmann, and Anja Engel
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We measured dissolved organic carbon (DOC), nitrogen (DON) and matter (DOM) optical properties in pore waters and near-bottom waters of the eastern tropical South Pacific off Peru. The difference between diffusion-driven and net fluxes of DOC and DON and qualitative changes in DOM optical properties suggested active microbial utilisation of the released DOM at the sediment–water interface. Our results suggest that the sediment release of DOM contributes to microbial processes in the area.
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Short summary
We present new data concerning the relation between biogenic barium (Baxs, a tracer of carbon remineralization at mesopelagic depths), O2 consumption and prokaryotic heterotrophic production (PHP) in the Mediterranean Sea. The purpose of this paper is to improve our understanding of the relation between Baxs, PHP and O2 and to test the validity of the Dehairs transfer function in the Mediterranean Sea. This relation has never been tested in the Mediterranean Sea.
We present new data concerning the relation between biogenic barium (Baxs, a tracer of carbon...
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