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https://doi.org/10.5194/bg-2020-271
https://doi.org/10.5194/bg-2020-271

  23 Sep 2020

23 Sep 2020

Review status: this preprint is currently under review for the journal BG.

Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)

Stéphanie H. M. Jacquet, Christian Tamburini, Marc Garel, Aurélie Dufour, France Van-Vambeke, Frédéric A. C. Le Moigne, Nagib Bhairy, and Sophie Guasco Stéphanie H. M. Jacquet et al.
  • Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110,13288 Marseille, France

Abstract. We report on the sub-basins variability of particulate organic carbon (POC) remineralization in the central and western Mediterranean Sea during a late spring period (PEACETIME cruise). POC remineralization rates (MR) were estimated using the excess non-lithogenic particulate barium (Baxs) inventories in mesopelagic waters (100–1000 m) and compared with prokaryotic heterotrophic production (PHP). MR range from 25 ± 2 to 306 ± 70 mg C m−2 d−1. Results reveal larger MR processes in the Algerian (ALG) basin compared to the Tyrrhenian (TYR) and Ionian (ION) basins. Baxs inventories and PHP also indicates that significant remineralization occurs over the whole mesopelagic layers in the ALG basin in contrast to the ION and TYR basins where remineralization is mainly located in the upper 500 m horizon. We propose that this may be due to particle injection pumps likely driven by strong winter convection in the Western basin of the Mediterranean Sea. This implies significant differences in the remineralization length scale of POC in the central Mediterranean Sea relative to the western region.

Stéphanie H. M. Jacquet et al.

 
Status: final response (author comments only)
Status: final response (author comments only)
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Stéphanie H. M. Jacquet et al.

Stéphanie H. M. Jacquet et al.

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