Characterization of boron incorporation and speciation in calcite and aragonite from co-precipitation experiments under controlled pH, temperature and precipitation rate

Mavromatis, Vasileios; Montouillout, V.; Noireaux, Johanna; Gaillardet, Jérôme; Schott, Jacques

doi:10.1016/j.gca.2014.10.024

Cited by 117 publications

(139 citation statements)

References 44 publications

(62 reference statements)

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“…De Carlo et al (2018) (Balan et al, 2016). Allison (2017) replotted the combined datasets of Mavromatis et al (2015) and Holcomb et al (2016) for synthetic aragonites precipitated at 25°C to show that KD is highly dependent on precipitating fluid saturation state. This may reflect enhanced incorporation of B during rapid crystal extension, as in calcite (Gabitov et al, 2014).…”

Section: Calculation Of Calcification Fluid Dic Parametersmentioning

confidence: 99%

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

Allison¹

2018

Preprint

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Ocean acidification typically reduces calcification in tropical marine corals but the mechanism for this process is not understood. We use skeletal boron geochemistry (B/Ca and δ 11 B) to reconstruct the calcification fluid DIC of corals cultured over both high and low seawater pCO2 (180, 400 and 750 μatm). We observe strong positive correlations between calcification fluid pH and concentrations of the DIC species potentially implicated in aragonite precipitation (be they CO3 ). Similarly, with the exception of one outlier, the fluid concentrations of precipitating DIC species are strongly positively correlated with coral calcification rate. Corals cultured at high seawater pCO2 usually have low calcification fluid pH and low concentrations of precipitating DIC, suggesting that a reduction in DIC substrate at the calcification site is responsible for decreased calcification. The outlier coral maintained high pHCF and DICCF at high seawater pCO2 but exhibited a reduced calcification rate indicating that the coral has a limited energy budget to support proton extrusion from the calcification fluid and meet other calcification demands. We find no evidence that increasing seawater pCO2 enhances diffusion of CO2 into the calcification site. Instead the overlying [CO2] available to diffuse into the calcification site appears broadly comparable between seawater pCO2 treatments, implying that metabolic activity (respiration and photosynthesis) generates a similar [CO2] in the vicinity of the calcification site regardless of seawater pCO2.

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Section: Calculation Of Calcification Fluid Dic Parametersmentioning

confidence: 99%

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

Allison¹

2018

Preprint

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“…Given the variety of possible exchange reactions and partition coefficients that have 20 been proposed (Allen and Hönisch, 2012;Mavromatis et al, 2015;Holcomb et al, 2016;Allison, 2017;McCulloch et al, 2017), we begin with a brief review of how partition coefficients are derived. In general, the substitution of minor elements into a solid is described by an exchange reaction such that:…”

Section: Partitioning Of B/ca Between Aragonite and Seawatermentioning

confidence: 99%

“…Thus, the bulk precipitation rate data of Holcomb et al (2016) should be comparable among their experiments, allowing us to evaluate between the reactions of Eq. (10) Mavromatis et al (2015) relative to Holcomb et al (2016). Potentially as result of one or both of these differences, Mavromatis et al (2015) found much lower K D values than Holcomb et al (2016).…”

mentioning

confidence: 97%

“…Further, incorporation into the skeleton is less important for B/Ca than U/Ca because the partition coefficient between B and [CO 2− 3 ] is at least 2 orders of magnitude smaller than that of U/CO 2− 3 (DeCarlo et al, 2015;Mavromatis et al, 2015;Holcomb et al, 2016) ] cf is elevated relative to seawater and is modified by CO 2 diffusion and pH up-regulation (i.e. it is not in a closed system) (Adkins et al, 2003;Cai et al, 2016), meaning that [B]/[CO 2− 3 ] cf is likely not changed substantially due to skeletal aragonite precipitation.…”

mentioning

confidence: 99%

“…(10) Mavromatis et al (2015) relative to Holcomb et al (2016). Potentially as result of one or both of these differences, Mavromatis et al (2015) found much lower K D values than Holcomb et al (2016). Here, we consider four possible K D dependencies based on these two experimental datasets (Figure 2).…”

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confidence: 99%

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Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification

DeCarlo¹,

Holcomb²,

McCulloch³

2018

Preprint

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has not yet been a comprehensive analysis that considers both experimental datasets and explores the implications for interpreting coral skeletons. Here, we evaluate four potential K D formulations: three previously presented in the literature and one newly developed. We assess how well each formulation reconstructs the known fluid carbonate chemistry from the abiogenic experiments, and we evaluate the implications for deriving the carbonate chemistry of coral calcifying fluid. Three of the K D formulations performed similarly when applied to abiogenic aragonites precipitated from 10 seawater and to coral skeletons. Critically, we find that some uncertainty remains in understanding the mechanism of boron elemental partitioning between aragonite and seawater, and addressing this question should be a target of additional abiogenic precipitation experiments. Despite this, boron systematics can already be applied to quantify the coral calcifying fluid carbonate system, although uncertainties associated with the proxy system should be carefully considered for each application. Finally, we present a user-friendly computer code that calculates coral calcifying fluid carbonate chemistry, including propagation of 15 uncertainties, given inputs of boron systematics measured in coral skeleton.

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Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions

et al. 2017

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The B/Ca ratio of planktic foraminiferal calcite, a proxy for the surface ocean carbonate system, displays large negative excursions during the Paleocene‐Eocene Thermal Maximum (PETM, 55.9 Ma), consistent with rapid ocean acidification at that time. However, the B/Ca excursion measured at the PETM exceeds a magnitude that modern pH calibrations can explain. Numerous other controls on the proxy have been suggested, including foraminiferal growth rate and the total concentration of dissolved inorganic carbon (DIC). Here we present new calibrations for B/Ca versus the combined effects of pH and DIC in the symbiont‐bearing planktic foraminifer Orbulina universa, grown in culture solutions with simulated Paleocene seawater elemental composition (high [Ca], low [Mg], and low total boron concentration ([B]T). We also investigate the isolated effects of low seawater [B]T, high [Ca], reduced symbiont photosynthetic activity, and average shell growth rate on O. universa B/Ca in order to further understand the proxy systematics and to determine other possible influences on the PETM records. We find that average shell growth rate does not appear to determine B/Ca in high calcite saturation experiments. In addition, our “Paleocene” calibration shows higher sensitivity than the modern calibration at low [B(OH)4−]/DIC. Given a large DIC pulse at the PETM, this amplification of the B/Ca response can more fully explain the PETM B/Ca excursion. However, further calibrations with other foraminifer species are needed to determine the range of foraminifer species‐specific proxy sensitivities under these conditions for quantitative reconstruction of large carbon cycle perturbations.

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Characterization of boron incorporation and speciation in calcite and aragonite from co-precipitation experiments under controlled pH, temperature and precipitation rate

Cited by 117 publications

References 44 publications

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification

Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions

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