Articles | Volume 18, issue 22
Biogeosciences, 18, 5891–5902, 2021

Special issue: Atmospheric deposition in the low-nutrient-low-chlorophyll...

Biogeosciences, 18, 5891–5902, 2021
Research article
16 Nov 2021
Research article | 16 Nov 2021

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

Stéphanie H. M. Jacquet et al.

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Cited articles

Ayata, S.-D., Irisson, J.-O., Aubert, A., Berline, L., Dutay, J.-C., Mayot, N., Nieblas, A.-E., D'Ortenzio, F., Palmiéri, J., Reygondeau, G., Rossi, V., and Guieu, C.: Regionalisation of the Mediterranean basin, a MERMEX synthesis, Prog. Oceanogr., 163, 7–20,, 2018. 
van Beek, P., Sternberg, E., Reyss, J.-L., Souhaut, M., Robin, E., and Jeandel, C.: 228Ra/226Ra and 226Ra/Ba ratios in the Western Mediterranean Sea: Barite formation and transport in the water column, Geochim. Cosmochim. Ac., 73, 4720–4737,, 2009. 
Berline, L., Doglioli, A. M., Petrenko, A., Barrillon, S., Espinasse, B., Le Moigne, F. A. C., Simon-Bot, F., Thyssen, M., and Carlotti, F.: Long distance particle transport to the central Ionian Sea, Biogeosciences Discuss. [preprint],, in review, 2021. 
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Boyd, P., Claustre, H., Levy, M., Siegel, D., and Weber, T.: Multi-faceted particle pumps drive carbon sequestration in the ocean, Nature, 568, 327–335,, 2019. 
Short summary
We compared carbon remineralization rates (MRs) in the western and central Mediterranean Sea in late spring during the PEACETIME cruise, as assessed using the barium tracer. We reported higher and deeper (up to 1000 m depth) MRs in the western basin, potentially sustained by an additional particle export event driven by deep convection. The central basin is the site of a mosaic of blooming and non-blooming water masses and showed lower MRs that were restricted to the upper mesopelagic layer.
Final-revised paper