23 Sep 2020
23 Sep 2020
Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110,13288 Marseille, France
- 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.


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RC1: 'Review on MR fluxes in the Med Sea', Anonymous Referee #1, 29 Sep 2020
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AC1: 'Reply on RC1', Stéphanie Jacquet, 30 Mar 2021
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AC1: 'Reply on RC1', Stéphanie Jacquet, 30 Mar 2021
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RC2: 'Review of manuscript #bg-2020-271 by Jacquet et al.', Anonymous Referee #2, 11 Nov 2020
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AC2: 'Reply on RC2', Stéphanie Jacquet, 30 Mar 2021
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AC2: 'Reply on RC2', Stéphanie Jacquet, 30 Mar 2021
Stéphanie H. M. Jacquet et al.
Stéphanie H. M. Jacquet et al.
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