@misc{76038, type = "Article", year = "2021", title = "On the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralization", journal = "Biogeosciences", editor = "Copernicus GmbH", volume = "18", number = "6", pages = "2205-2212", author = "Jacquet Stéphanie Hm, Lefèvre Dominique, Tamburini Christian, Garel Marc, Le Moigne Frédéric Ac, Bhairy Nagib, Guasco Sophie", url = "https://archimer.ifremer.fr/doc/00648/76038/", organization = "", address = "FRANCE", doi = "https://doi.org/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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