FN Archimer Export Format PT J TI Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project) BT AF Jacquet, Stéphanie HM Tamburini, Christian Garel, Marc Dufour, Aurélie Van Vambeke, France Le Moigne, Frédéric AC BHAIRY, Nagib Guasco, Sophie AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;8:1; FF 1:;2:;3:;4:;5:;6:;7:;8:; C1 Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille, France C2 UNIV AIX MARSEILLE, FRANCE SI TOULON SE CNRS IN DOAJ TC 0 UR https://archimer.ifremer.fr/doc/00652/76399/77438.pdf https://archimer.ifremer.fr/doc/00652/76399/89864.pdf LA English DT Article CR PEACETIME BO Pourquoi pas ? AB 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. PY 2021 SO Biogeosciences SN 1726-4189 PU Copernicus GmbH VL 18 IS 22 BP 5891 EP 5902 DI 10.5194/bg-2020-271 ID 76399 ER EF