Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa
| العنوان: | Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa |
|---|---|
| المؤلفون: | Howes, Ella L., Kaczmarek, Karina, Raitzsch, Markus, Mewes, Antje, Bijma, Nienke, Horn, Ingo, Misra, Sambuddha, Gattuso, Jean-Pierre, Bijma, Jelle |
| المساهمون: | Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Center for Marine Environmental Sciences [Bremen] (MARUM), Universität Bremen, Christian-Albrechts-Universität zu Kiel (CAU), Leibniz Universität Hannover=Leibniz University Hannover, University of Cambridge [UK] (CAM), Laboratoire d'océanographie de Villefranche (LOV), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Sciences Po (Sciences Po), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Leibniz Universität Hannover [Hannover] (LUH), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Biogeosciences 14 (2017), Nr. 2 Biogeosciences Biogeosciences, 2017, 14 (2), pp.415-430. ⟨10.5194/bg-14-415-2017⟩ Biogeosciences, European Geosciences Union, 2017, 14 (2), pp.415-430. ⟨10.5194/bg-14-415-2017⟩ EPIC3Biogeosciences, COPERNICUS GESELLSCHAFT MBH, 14, pp. 415-430, ISSN: 1726-4170 Biogeosciences, Vol 14, Iss 2, Pp 415-430 (2017) |
| بيانات النشر: | Göttingen : Copernicus GmbH, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | lcsh:Geology, lcsh:QH501-531, sub-01, lcsh:QH540-549.5, Orbulina universa, lcsh:QE1-996.5, lcsh:Life, ddc:550, lcsh:Ecology, Foraminifera, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
| الوصف: | In order to fully constrain paleo-carbonate systems, proxies for two out of seven parameters, plus temperature and salinity, are required. The boron isotopic composition (δ11B) of planktonic foraminifera shells is a powerful tool for reconstructing changes in past surface ocean pH. As B(OH)4− is substituted into the biogenic calcite lattice in place of CO32−, and both borate and carbonate ions are more abundant at higher pH, it was suggested early on that B ∕ Ca ratios in biogenic calcite may serve as a proxy for [CO32−]. Although several recent studies have shown that a direct connection of B ∕ Ca to carbonate system parameters may be masked by other environmental factors in the field, there is ample evidence for a mechanistic relationship between B ∕ Ca and carbonate system parameters. Here, we focus on investigating the primary relationship to develop a mechanistic understanding of boron uptake. Differentiating between the effects of pH and [CO32−] is problematic, as they co-vary closely in natural systems, so the major control on boron incorporation remains unclear. To deconvolve the effects of pH and [CO32−] and to investigate their impact on the B ∕ Ca ratio and δ11B, we conducted culture experiments with the planktonic foraminifer Orbulina universa in manipulated culture media: constant pH (8.05), but changing [CO32−] (238, 286 and 534 µmol kg−1 CO32−) and at constant [CO32−] (276 ± 19.5 µmol kg−1) and varying pH (7.7, 7.9 and 8.05). Measurements of the isotopic composition of boron and the B ∕ Ca ratio were performed simultaneously using a femtosecond laser ablation system coupled to a MC-ICP-MS (multiple-collector inductively coupled plasma mass spectrometer). Our results show that, as expected, δ11B is controlled by pH but it is also modulated by [CO32−]. On the other hand, the B ∕ Ca ratio is driven by [HCO3−], independently of pH. This suggests that B ∕ Ca ratios in foraminiferal calcite can possibly be used as a second, independent, proxy for complete paleo-carbonate system reconstructions. This is discussed in light of recent literature demonstrating that the primary relationship between B ∕ Ca and [HCO3−] can be obscured by other environmental parameters. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1726-4170 1726-4189 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::5976bd6595e7c7e98f885b2b29149cd0 http://www.repo.uni-hannover.de/handle/123456789/1249 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.dedup.wf.001..5976bd6595e7c7e98f885b2b29149cd0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17264170 17264189 |
|---|