Decoupled carbonate chemistry controls on the incorporation of boron into <i>Orbulina universa</i>

Howes, Ella L.; Kaczmarek, Karina; Raitzsch, Markus; Mewes, Antje; Bijma, Nienke; Horn, Ingo; Misra, Sambuddha; Gattuso, Jean-Pierre; Bijma, Jelle

doi:10.5194/bg-14-415-2017

Articles | Volume 14, issue 2

https://doi.org/10.5194/bg-14-415-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/bg-14-415-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 14, issue 2

Research article

|

26 Jan 2017

Research article |

| 26 Jan 2017

Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa

Ella L. Howes, Karina Kaczmarek, Markus Raitzsch, Antje Mewes, Nienke Bijma, Ingo Horn, Sambuddha Misra, Jean-Pierre Gattuso, and Jelle Bijma

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Sep 2016	9	2	0	11
Oct 2016	14	4	1	19
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Dec 2016	7	3	0	10
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Feb 2017	59	21	12	92
Mar 2017	32	18	2	52
Apr 2017	34	16	0	50
May 2017	30	19	1	50
Jun 2017	36	10	0	46
Jul 2017	26	20	4	50
Aug 2017	41	21	1	63
Sep 2017	35	13	0	48
Oct 2017	14	6	0	20
Nov 2017	32	11	2	45
Dec 2017	18	4	0	22
Jan 2018	10	13	1	24
Feb 2018	7	8	0	15
Mar 2018	14	14	2	30
Apr 2018	11	9	0	20
May 2018	9	15	2	26
Jun 2018	17	17	5	39
Jul 2018	14	7	3	24
Aug 2018	15	11	6	32
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May 2024	33	10	3	46
Jun 2024	54	9	2	65
Jul 2024	38	14	3	55
Aug 2024	46	14	3	63
Sep 2024	21	11	0	32
Oct 2024	30	14	2	46
Nov 2024	22	6	1	29
Dec 2024	24	4	1	29
Jan 2025	29	7	0	36
Feb 2025	42	7	2	51
Mar 2025	31	11	1	43
Apr 2025	32	20	1	53
May 2025	36	11	0	47
Jun 2025	53	19	0	72
Jul 2025	42	23	2	67
Aug 2025	49	17	3	69
Sep 2025	42	26	4	72
Oct 2025	38	19	1	58
Nov 2025	45	31	5	81
Dec 2025	2	3	0	5

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Short summary

To calculate the seawater carbonate system, proxies for 2 out of 7 parameters are required. The boron isotopic composition of foraminifera shells can be used as a proxy for pH and it has been suggested that B / Ca ratios may act as a proxy for carbonate ion concentration. However, differentiating between the effects of pH and [CO₃²⁻] is problematic, as they co-vary in natural systems. To deconvolve the effects, we conducted culture experiments with the planktonic foraminifer Orbulina universa.