On the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralization

Type Article
Date 2021
Language English
Author(s) Jacquet Stéphanie Hm1, Lefèvre Dominique1, Tamburini Christian1, Garel Marc1, Le Moigne Frédéric Ac1, Bhairy Nagib1, Guasco Sophie1
Affiliation(s) 1 : Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille, France
Source Biogeosciences (1726-4189) (Copernicus GmbH), 2021 , Vol. 18 , N. 6 , P. 2205-2212
DOI 10.5194/bg-18-2205-2021
Abstract

n the ocean, remineralization rate associated with sinking particles is a crucial variable. Since the 1990s, particulate biogenic barium (Baxs) has been used as an indicator of carbon remineralization by applying a transfer function relating Baxs to O2 consumption (Dehairs's transfer function, Southern Ocean-based). Here, we tested its validity in the Mediterranean Sea (ANTARES/EMSO-LO) for the first time by investigating connections between Baxs, prokaryotic heterotrophic production (PHP) and oxygen consumption (JO2-Opt; optodes measurement). We show that (1) higher Baxs (409 pM; 100–500 m) occurs in situations where integrated PHP (PHP100/500=0.90) is located deeper, (2) higher Baxs occurs with increasing JO2-Opt, and (3) there is similar magnitude between JO2-Opt (3.14 mmol m−2 d−1; 175–450 m) and JO2-Ba (4.59 mmol m−2 d−1; transfer function). Overall, Baxs, PHP and JO2 relationships follow trends observed earlier in the Southern Ocean. We conclude that such a transfer function could apply in the Mediterranean Sea.

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Jacquet Stéphanie Hm, Lefèvre Dominique, Tamburini Christian, Garel Marc, Le Moigne Frédéric Ac, Bhairy Nagib, Guasco Sophie (2021). On the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralization. Biogeosciences, 18(6), 2205-2212. Publisher's official version : https://doi.org/10.5194/bg-18-2205-2021 , Open Access version : https://archimer.ifremer.fr/doc/00648/76038/