Glacial–interglacial changes in Subantarctic sea surface temperature and δ18O-water using foraminiferal Mg

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

doi:10.1016/s0012-821x(99)00116-8

Cited by 357 publications

(369 citation statements)

References 54 publications

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“…Reproducibility of the standard and replicate samples in this study is ±0.06 and ±0.08 mmol/mol, respectively. The Mg/Ca for G. bulloides measured for this study vary between 3.82 and 5.86 mmol/mol, well within the range of other reported G. bulloides Mg/Ca Mashiotta et al, 1999;Elderfield and Ganssen, 2000;.…”

Section: Methodssupporting

confidence: 88%

An 8‐century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth‐century warming, and Atlantic hurricane frequency

et al. 2007

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[1] We present the first direct comparison and calibration of a downcore foraminiferal Mg/Ca record to historical instrumental sea surface temperature (SST). Mg/Ca measured on the planktic foraminifer Globigerina bulloides from a Cariaco Basin sediment core strongly correlate with spring (March-May) instrumental SSTs between A.D. 1870 and 1990. A Mg/Ca SST equation is derived and a paleo-SST record is presented spanning the last 8 centuries, an interval that includes the end of the Medieval Warm Period and the Little Ice Age. The long-term record displays a surprising amount of variability. The temperature swings are not necessarily related to local upwelling variability but instead represent wider conditions in the Caribbean and western tropical Atlantic. The Mg/Ca SST record also captures the decadal and multidecadal variability observed in records of global land and sea surface temperature anomalies and Atlantic tropical storm and hurricane frequency over the late nineteenth and twentieth centuries. A divergence between the SST proxy record and Atlantic storm frequency around 1970 appears to reflect a fundamental change in Atlantic hurricane behavior noted in historical data. On average, twentieth-century temperatures are not the warmest in the entire record, but they do show the largest increase in magnitude and fastest rate of SST change over the last 800 a.

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Section: Methodssupporting

confidence: 88%

An 8‐century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth‐century warming, and Atlantic hurricane frequency

et al. 2007

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“…the development and calibration of this proxy have come from laboratory culture, sediment traps, plankton tows and core-tops, and nearly all regions of the world's oceans. Consistent throughout all of these calibration studies is an exponential Mg/Ca ratio:temperature sensitivity of 8-10% change in ratio per • C (Anand et al, 2003;Bolton et al, 2011;Dekens et al, 2002;Lea et al, 1999;Martínez-Botí et al, 2011;Mashiotta et al, 1999;McConnell and Thunell, 2005;Regenberg et al, 2009). The influences of secondary factors such as salinity and carbonate chemistry are still being evaluated, and in many cases appear to be species -and/or regionspecific (Arbuszewski et al, 2010;Dekens et al, 2002;Evans et al, 2016;Hertzberg and Schmidt, 2013;Hönisch et al, 2013;Kısakürek et al, 2008;Russell et al, 2004).…”

Section: Introductionmentioning

confidence: 93%

Evaluating controls on planktonic foraminiferal geochemistry in the Eastern Tropical North Pacific

Gibson

Thunell

Fehrenbacher

et al. 2016

Earth and Planetary Science Letters

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between mixed-layer species G. ruber and G. bulloides and thermocline-dweller G. menardii track seasonal changes in upwelling. The records suggest an increase in upwelling during the peak positive phase of El Niño, and an overall reduction in stratification over the six-year period. For all three species, Mg/Ca ratios are higher than what has been reported in previous studies, and show poor correlations to calcification temperature. We suggest that low pH (7.6-8.0) and [CO 3 2− ] values (∼70-120 μmol/kg) in the mixed layer contribute to an overall trend of higher Mg/Ca ratios in this region. Laser Ablation Inductively Coupled Mass Spectrometry analyses of G. bulloides with high Mg/Ca ratios (>9 mmol/mol) reveal the presence of a secondary coating of inorganic calcite that has Mg/Ca and Mn/Ca ratios up to an order of magnitude higher than these elemental ratios in the primary calcite, along with elevated Sr/Ca and Ba/Ca ratios. Some of the samples with abnormally high Mg/Ca are found during periods of high primary productivity, suggesting the alteration may be related to changes in carbonate saturation resulting from remineralization of organic matter in oxygen-poor waters in the water column. Although similar shell layering has been observed on fossil foraminifera, this is the first time such alteration has been studied in shells collected from the water column. Our results suggest a role for seawater carbonate chemistry in influencing foraminiferal calcite trace element:calcium ratios prior to deposition on the seafloor, particularly in high-productivity, low-oxygen environments.

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“…The Mg/Ca ratio in foraminiferal calcite is widely used to reconstruct seawater temperatures (Barker et al, 2005;Jonkers et al, 2010b;Lea et al, 2000;Mashiotta et al, 1999). However, Mg/Catemperature relationships are species specific and remain (largely) empirical and many studies have shown a tight biological control on Mg incorporation in foraminiferal calcite (Anand et al, 2003;Bentov and Erez, 2006;de Nooijer et al, 2014;Jonkers et al, 2012;Jonkers et al, 2013a;Lea et al, 1999;Spero et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Chamber formation leads to Mg/Ca banding in the planktonic foraminifer Neogloboquadrina pachyderma

Jonkers

Buse

Brummer

et al. 2016

Earth and Planetary Science Letters

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Additionally, all specimens are covered with an outer crust consisting of large euhedral crystals. The composition of the crust is similar to the low Mg/Ca bands in the laminar calcite in winter and summer specimens, indicating a tight biological control on crust formation and composition.Nevertheless, despite high intratest variability, the median Mg/Ca of summertime tests is higher than that of wintertime tests. This provides support for Mg/Ca paleothermometry, but to improve the accuracy of paleotemperature estimates biological effects on Mg incorporation need to be better accounted for.

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Glacial–interglacial changes in Subantarctic sea surface temperature and δ18O-water using foraminiferal Mg

Cited by 357 publications

References 54 publications

An 8‐century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth‐century warming, and Atlantic hurricane frequency

An 8‐century tropical Atlantic SST record from the Cariaco Basin: Baseline variability, twentieth‐century warming, and Atlantic hurricane frequency

Evaluating controls on planktonic foraminiferal geochemistry in the Eastern Tropical North Pacific

Chamber formation leads to Mg/Ca banding in the planktonic foraminifer Neogloboquadrina pachyderma

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