Controls on magnesium and strontium uptake in planktonic foraminifera determined by live culturing

Lea, David W.; Mashiotta, Tracy A.; Spero, Howard J.

doi:10.1016/s0016-7037(99)00197-0

Cited by 690 publications

(858 citation statements)

References 39 publications

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“…2A) (Nürnberg et al, 1996b;Lea et al, 1999;Elderfield and Ganssen, 2000;Anand et al, 2003;Russell et al, 2004;McConnell and Thunell, 2005;Kısakürek et al, 2008). All these calibrations show an increase in the incorporation of Mg into foraminiferal test carbonate with increasing temperatures.…”

Section: Discussionmentioning

confidence: 84%

“…3D and E and 4B). In contrast, existing calibrations by Lea et al (1999) and Kısakürek et al (2008) showed that in cultured O. universa and G. ruber (white) Sr incorporation increases more rapidly with salinity changes (Fig. 4B).…”

Section: Effect Of Salinity On Mg/ca and Sr/ca Ratiosmentioning

confidence: 79%

“…4B). Lea et al (1999) and Kısakürek et al (2008) also reported a positive correlation between Sr/Ca and salinity for the planktonic foraminifera O. universa and G. ruber (white) respectively. The 95% confidence interval from our data encompasses the previous Sr/Ca-salinity correlations of the two other species of planktonic foraminifera which means that Sr incorporation in these three planktonic species is -at least statistically -comparable and thus potentially reflects similar processes related to salinity increases.…”

Section: Effect Of Salinity On Mg/ca and Sr/ca Ratiosmentioning

confidence: 81%

“…Accurate temperature reconstructions, therefore, rely on an understanding of these additional factors that can potentially influence the incorporation of Mg and Sr in foraminiferal calcite. Through culture experiments salinity showed to exert a small but consistent influence on foraminiferal Mg/Ca ratios (Nürnberg et al, 1996a;Lea et al, 1999;Kısakürek et al, 2008). More recently, Ferguson etal.…”

Section: Introductionmentioning

confidence: 90%

“…Over the past two decades temperature reconstructions have become increasingly reliant on Mg/Ca ratios measured on planktonic and benthic foraminiferal shells (Nürnberg et al, 1996a;Lea et al, 1999;Russell et al, 2004;Rosenthal et al, 2006;Yu and Elderfield, 2008). The incorporation of Sr into foraminiferal calcite may also show temperature dependence Reichart et al, 2003;Mortyn et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Dueñas-Bohórquez

Rocha

Kuroyanagi

et al. 2009

Marine Micropaleontology

100

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Section: Discussionmentioning

confidence: 84%

Section: Effect Of Salinity On Mg/ca and Sr/ca Ratiosmentioning

confidence: 79%

Section: Effect Of Salinity On Mg/ca and Sr/ca Ratiosmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Dueñas-Bohórquez

Rocha

Kuroyanagi

et al. 2009

Marine Micropaleontology

100

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Seawater Temperature Estimates in Paleoceanography

Cortese

2004

Water Encyclopedia

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Temperature, together with salinity, determines the density of seawater, and therefore, it strongly influences its circulation and sinking characteristics. In turn, the important role oceanic circulation and deep‐water formation play in past, present, and future climatic change lend a special significance to the estimate of past seawater temperature. As the past values of this important climatic variable in the distant, geological past are impossible to measure directly, a variety of indirect methods, so‐called “proxies,” have been developed. These methods are usually based on the fossil faunal/floral composition of sediment core samples, as a close link exists between species occurrences/abundances and environmental variables. Semiquantitative (e.g., faunal provinces indexes) and quantitative (e.g., transfer functions, neural networks) techniques are therefore applied to reconstruct past sea surface water variables, including temperature. Additionally, several geochemical methods have been recently developed to estimate past ocean temperatures by measuring chemical elements (Mg/Ca, Sr/Ca) or organic compounds (alkenones), which are either incorporated in the organism shell, or produced during its life cycle.

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The late Pliocene Benguela upwelling status revisited by means of multiple temperature proxies

Leduc

Garbe‐Schönberg²,

Regenberg³

et al. 2014

Geochem Geophys Geosyst

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[1] As compared to the late Pleistocene, Alkenone-based sea surface temperature (SST) in the Benguela region revealed relatively warm and stable SST recorded between 3.5 and 2.0 Ma, and coincide with a period of increasing biological productivity as revealed by increasing deposition of biogenic opal. We assess how the hydrological patterns recorded in SST proxies are embedded in the geological record by performing a proxy-proxy comparison. We used Laser-Ablation Inductively Coupled Plasma-Mass Spectrometry to measure the Mg/Ca on the planktonic foraminifera species Globigerina bulloides, allowing in situ measurements of Mg/Ca on individual foraminiferal tests. Mg/Ca-derived temperatures provide much colder temperatures than alkenone-derived SST by up to 10 C. We build a scenario involving contrasting sensitivities of paleothermometers upon the annual cycle, namely alkenones preferentially capturing SST when the surface ocean is warmer than the mean-annual average SST, and G. bulloides capturing SST when upwelling intensifies. Multichamber analysis also suggests that G. bulloides migrates below the sea surface while calcifying its last chambers prior to gametogenesis, allowing the extraction of both surface and subsurface temperature from Mg/Ca measured on different chambers. The range of temperatures recorded between our multiple SST proxies is supported by the range of temperatures simulated with a general circulation model when different seasons, different water depth and different orbital configurations occurring during the late Pliocene are considered. A greater seasonal cycle in SST during the Pliocene can account for alkenone and Mg/Ca-derived temperature contrast, pointing to a radically different mode of upwelling activity in the Benguela region compared to today.

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Controls on magnesium and strontium uptake in planktonic foraminifera determined by live culturing

Cited by 690 publications

References 39 publications

Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera

Seawater Temperature Estimates in Paleoceanography

The late Pliocene Benguela upwelling status revisited by means of multiple temperature proxies

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