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On the barium-oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralisation
Biogeosciences ( IF 3.9 ) Pub Date : 2020-09-07 , DOI: 10.5194/bg-2020-241
Stéphanie H. M. Jacquet , Dominique Lefèvre , Christian Tamburini , Marc Garel , Frédéric A. C. Le Moigne , Nagib Bhairy , Marie Roumagnac , Sophie Guasco

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.

中文翻译:

关于地中海中钡氧气消耗的关系:对中古海洋雪再矿化的影响

摘要。在海洋中,与沉没颗粒有关的再矿化率是一个关键变量。从90年代开始,通过应用将Ba xs与O 2消耗相关的传递函数(Dehairs的传递函数,基于南大洋洲),将颗粒状生物钡(Ba xs)用作碳再矿化的指标。在这里,我们通过研究Ba xs,原核异养产物(PHP)和耗氧量(JO 2 -Opt;光电二极管测量)之间的联系,首次在地中海(ANTARES / EMSO-LO)中测试了其有效性。我们证明:(1)Ba xs更高(409 PM; 100-500米)在集成PHP(PHP100 / 500 = 0.90)位于更深的情况下,(2)较高的Ba XS随JO 2 -OPT,和(3)之间JO相似的幅度2 -OPT( 3.14 mmol m -2  d -1; 175-450 m)和JO 2 -Ba(4.59 mmol m -2  d -1;传递函数)。总体而言,Ba xs,PHP和JO 2关系遵循在南大洋观察到的趋势。我们认为,这种转移功能可以不受限制地适用于地中海。
更新日期:2020-09-08
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