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On the barium-oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralisation

Résumé : Abstract. In the ocean, remineralisation rate associated with sinking particles is a crucial variable. Since the 90's, 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) in situations where integrated PHP (PHP100/500 = 0.90) is located deeper, (2) higher Baxs with increasing JO2-Opt, and (3) 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 in the Southern Ocean. We believe that such transfer function could apply in the Mediterranean Sea with no restriction.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-02960676
Contributor : Frederic Le Moigne <>
Submitted on : Wednesday, October 7, 2020 - 8:55:12 PM
Last modification on : Tuesday, September 14, 2021 - 8:24:01 AM

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Stéphanie Jacquet, Dominique Lefèvre, Christian Tamburini, Marc Garel, Frédéric A.C. Le Moigne, et al.. On the barium-oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralisation. 2020. ⟨hal-02960676⟩

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