Kaczmarek, K. and Langer, G. and Nehrke, G. and Horn, I. and Misra, S. and Janse, M. and Bijma, J. (2015) Boron incorporation in the foraminifer <i>Amphistegina lessonii</i> under a decoupled carbonate chemistry. Biogeosciences, 12 (6). pp. 1753-1763. ISSN 1726-4189 DOI 10.5194/bg-12-1753-2015
|
Text
bg-12-1753-2015.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview |
|
|
Text (Corrigendum)
bg-12-2469-2015.pdf - Published Version Available under License Creative Commons Attribution. Download (24kB) | Preview |
Abstract
A number of studies have shown that the boron isotopic composition (δ11B) 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 δ11B 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 δ11B 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2015AREP; IA69; |
| Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems 04 - Palaeobiology |
| Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems 04 - Palaeobiology 07 - Gold Open Access |
| Journal or Publication Title: | Biogeosciences |
| Volume: | 12 |
| Page Range: | pp. 1753-1763 |
| Identification Number: | 10.5194/bg-12-1753-2015 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 05 Jun 2015 16:07 |
| Last Modified: | 25 Aug 2015 14:32 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/3325 |
Actions (login required)
 |
View Item |
Altmetric
Altmetric