Element partitioning during precipitation of aragonite from seawater: A framework for understanding paleoproxies

Gaetani, G. A.; Cohen, Anne L.

doi:10.1016/j.gca.2006.07.008

Cited by 353 publications

(409 citation statements)

References 65 publications

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“…In contrast, precipitation experiments have shown that Ba/Ca ratios are strongly anti-correlated with temperature in synthetic and scleractinian coral aragonite (Gaetani and Cohen, 2006). Gaetani and Cohen (2006) noted that the temperature correlation is not an equilibrium process and attributed their observation to surface entrapment of Ba during aragonite growth and coralline vital effects (active Ba discrimination into the calcifying fluid and temperature and/ or light dependent enzymatic ion pumping).…”

Section: Discussionmentioning

confidence: 99%

“…Gaetani and Cohen (2006) noted that the temperature correlation is not an equilibrium process and attributed their observation to surface entrapment of Ba during aragonite growth and coralline vital effects (active Ba discrimination into the calcifying fluid and temperature and/ or light dependent enzymatic ion pumping). Ba 2+ has an ion radius much larger than Ca 2+ and does not substitute as easily into calcite as into aragonite.…”

Section: Discussionmentioning

confidence: 99%

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Planktic foraminifers as recorders of seawater Ba/Ca

Hönisch

Allen

Russell

et al. 2011

Marine Micropaleontology

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Recent studies have used the Ba/Ca ratio of planktic foraminifer shells as a proxy for river run-off at oceanic sites near estuaries. Such studies assume that the Ba/Ca ratio in planktic foraminifer shells is primarily controlled by the Ba/Ca concentration of seawater and that other parameters such as salinity, temperature and pH do not compromise the primary Ba concentration relationship. Here we provide new insights from culture experiments and review published studies to confirm that environmental parameters including pH, temperature, salinity, and symbiont photosynthesis do not affect Ba substitution into planktic foraminiferal calcite. The partition coefficient for Ba in spinose planktic foraminifers is estimated as D Ba = 0.15 ± 0.05 (95% confidence limits). The same factor also seems applicable to the non-spinose genus Neogloboquadrina but not to specimens of the non-spinose genus Globorotalia.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Planktic foraminifers as recorders of seawater Ba/Ca

Hönisch

Allen

Russell

et al. 2011

Marine Micropaleontology

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“…One other process in the second step, inorganic precipitation of aragonite, can cause kinetic fractionation without changing EPF compositions. It is expected to cause positive correlation between Sr/Ca and precipitation rate 23 , so that the shell Sr/Ca is predicted to increase as aragonite is preferentially precipitated from EPF during daytime. This is not supported by observations.…”

Section: Discussionmentioning

confidence: 99%

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

et al. 2012

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The historical record of daily light cycle in tropical and subtropical regions is short. moreover, it remains difficult to extract this cycle in the past from natural archives such as biogenic marine carbonates. Here we describe the precise analysis of sr/Ca, mg/Ca, and Ba/Ca ratios in a cultivated giant clam shell, using a laterally high-resolution secondary ion mass spectrometer with 2 µm resolution. The sr/Ca ratio exhibits striking diurnal variations, reflecting the daily light cycle. A clear seasonal variation in sr/Ca is also observed in another longer set of measurements with 50 µm resolution. Light-enhanced calcification and elemental transportation processes, in giant clam and symbiotic algae, may explain these diurnal and annual variations. This opens the possibility to develop the sr/Ca ratio from a giant clam shell as an effective proxy for parameters of the daily light cycle.

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“…There are two ways to produce such samples. The first is to grow samples in the laboratory with either inorganic crystals [92] or marine organisms [89]. The advantage to this approach is that the system can be carefully controlled and varied over a range of appropriate settings.…”

Section: (Iv) Suggested Ways Forwardmentioning

confidence: 99%

Palaeoceanography: motivations and challenges for the future

Robinson

Siddall

2012

Phil. Trans. R. Soc. A.

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The ocean interacts with the atmosphere, biosphere and cryosphere in a complex way, modulating climate through the storage and transport of heat, nutrients and carbon. As such, it is important that we understand the ways in which the ocean behaves and the factors that can lead to change. In order to gain this understanding, we need to look back into the past, on time scales from recent decadal-scale change, through the abrupt changes of the Pleistocene and back to times when the Earth's climate was significantly different than the Holocene. A key challenge facing the field of palaeoceanography is to combine data and modelling in a common framework. Coupling palaeo-data and models should improve our knowledge of how the Earth works, and perhaps of more direct societal relevance, might enable us to provide better predictive capabilities in climate modelling. In this discussion paper, we examine the motivations, past successes and challenges facing palaeoceanographic studies. We then suggest a number of areas and approaches that we believe will allow palaeoceanography to continue to provide new insights into processes that affect future climate change.

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Element partitioning during precipitation of aragonite from seawater: A framework for understanding paleoproxies

Cited by 353 publications

References 65 publications

Planktic foraminifers as recorders of seawater Ba/Ca

Planktic foraminifers as recorders of seawater Ba/Ca

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

Palaeoceanography: motivations and challenges for the future

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