Boron incorporation in the foraminifer amphistegina lessonii under a decoupled carbonate chemistry

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dc.identifier.uri Kaczmarek, Karina Langer, G. Nehrke, Gernot Horn, Ingo Misra, Sambuddha Janse, M. Bijma, Jelle 2017-02-02T13:57:11Z 2017-02-02T13:57:11Z 2015
dc.identifier.citation Kaczmarek, K.; Langer, G.; Nehrke, G.; Horn, I.; Misra, S. et al.: Boron incorporation in the foraminifer amphistegina lessonii under a decoupled carbonate chemistry. In: Biogeosciences 12 (2015), Nr. 6, S. 1753-1763. DOI:
dc.description.abstract A number of studies have shown that the boron isotopic composition (delta B-11) and the B / Ca ratio of biogenic carbonates (mostly foraminifers) can serve as proxies for two parameters of the ocean's carbonate chemistry, rendering it possible to calculate the entire carbonate system. However, the B incorporation mechanism into marine carbonates is still not fully understood and analyses of field samples show species-specific and hydrographic effects on the B proxies complicating their application. Identifying the carbonate system parameter influencing boron incorporation is difficult due to the co-variation of pH, CO32- and B(OH)(4)(-). To shed light on the question which parameter of the carbonate system is related to the boron incorporation, we performed culture experiments with the benthic symbiont-bearing foraminifer Amphistegina lessonii using a decoupled pH-CO32- chemistry. The determination of the delta B-11 and B / Ca ratios was performed simultaneously by means of a new in situ technique combining optical emission spectroscopy and laser ablation MC-ICP-MS. The boron isotopic composition in the tests gets heavier with increasing pH and B / Ca increases with increasing B(OH)(4)(-) / HCO3- of the culture media. The latter indicates that boron uptake of A. lessonii features a competition between B(OH)(4)(-) and HCO3-. Furthermore, the simultaneous determination of B / Ca and delta B-11 on single specimens allows for assessing the relative variability of these parameters. Among different treatments the B / Ca shows an increasing variability with increasing boron concentration in the test whereas the variability in the isotope distribution is constant. eng
dc.description.sponsorship DFG/BI 432/7-1
dc.language.iso eng
dc.publisher Göttingen : Copernicus GmbH
dc.relation.ispartofseries Biogeosciences 12 (2015), Nr. 6
dc.rights CC BY 3.0 Unported
dc.subject isotopic composition eng
dc.subject globigerinoides-sacculifer eng
dc.subject nanogram level eng
dc.subject icp-ms eng
dc.subject delta-b-11 eng
dc.subject b/ca eng
dc.subject ph eng
dc.subject seawater eng
dc.subject proxy eng
dc.subject photosynthesis eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Boron incorporation in the foraminifer amphistegina lessonii under a decoupled carbonate chemistry eng
dc.type article
dc.type Text
dc.relation.essn 1726-4189
dc.relation.issn 1726-4170
dc.bibliographicCitation.issue 6
dc.bibliographicCitation.volume 12
dc.bibliographicCitation.firstPage 1753
dc.bibliographicCitation.lastPage 1763
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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