Benthic foraminiferal Mg/Ca-paleothermometry: a revised core-top calibration

Lear, C. H.; Rosenthal, Yair; Slowey, Niall C.

doi:10.1016/s0016-7037(02)00941-9

Cited by 333 publications

(518 citation statements)

References 31 publications

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“…Calibrations for Mg/Ca in benthic foraminifera also suggest a similar temperature sensitivity to planktonic species (e.g. Rosenthal et al, 1997;Lear et al, 2002, Table 1). The point has been made that empirically based calibrations are important since biological differences between species may cause significant offsets in Mg/Ca for a given temperature.…”

Section: Calibration Of Planktonic Foraminiferal Mg/ca Versus Temperamentioning

confidence: 76%

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Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Barker

Cacho

Benway

et al. 2005

Quaternary Science Reviews

236

163

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As part of the Multi-proxy Approach for the Reconstruction of the Glacial Ocean (MARGO) incentive, published and unpublished temperature reconstructions for the Last Glacial Maximum (LGM) based on planktonic foraminiferal Mg/Ca ratios have been synthesised and made available in an online database. Development and applications of Mg/Ca thermometry are described in order to illustrate the current state of the method. Various attempts to calibrate foraminiferal Mg/Ca ratios with temperature, including culture, trap and core-top approaches have given very consistent results although differences in methodological techniques can produce offsets between laboratories which need to be assessed and accounted for where possible. Dissolution of foraminiferal calcite at the sea-floor generally causes a lowering of Mg/Ca ratios. This effect requires further study in order to account and potentially correct for it if dissolution has occurred. Mg/Ca thermometry has advantages over other paleotemperature proxies including its use to investigate changes in the oxygen isotopic composition of seawater and the ability to reconstruct changes in the thermal structure of the water column by use of multiple species from different depth and or seasonal habitats. Presently available data are somewhat limited to low latitudes where they give fairly consistent values for the temperature difference between Late Holocene and the LGM (2-3.5 1C). Data from higher latitudes are more sparse, and suggest there may be complicating factors when comparing between multi-proxy reconstructions. r

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Section: Calibration Of Planktonic Foraminiferal Mg/ca Versus Temperamentioning

confidence: 76%

“…G. ruber (w) is the white variety picked from the 250-350 mm size fraction. The benthic calibration of Lear et al (2002) is given for comparison. SST=sea surface temperature, BWT=bottom water temperature.…”

Section: Calibration Of Planktonic Foraminiferal Mg/ca Versus Temperamentioning

confidence: 99%

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Barker

Cacho

Benway

et al. 2005

Quaternary Science Reviews

236

163

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“…Benthic and planktonic foraminifera, for instance have a Mg/Ca ratio sensitivity of~10% per°C (Elderfield and Ganssen, 2000;Lear et al, 2002). The sensitivity of Mg/Ca ratios in biogenic carbonate is, in general, significantly higher than that found in inorganic carbonates and its origin remains rather enigmatic.…”

Section: Mg/ca Ratios As An Independent Palaeothermometer In Patella mentioning

confidence: 99%

Increased seasonality in the Western Mediterranean during the last glacial from limpet shell geochemistry

Ferguson

Henderson

et al. 2011

Earth and Planetary Science Letters

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Editor: P. DeMenocalKeywords: mollusc seasonality Gibraltar palaeoclimate oxygen isotopesThe seasonal cycle is a fundamental aspect of climate, with a significant influence on mean climate and on human societies. Assessing seasonality in different climate states is therefore important but, outside the tropics, very few palaeoclimate records with seasonal resolution exist and there are currently no glacial-age seasonal-resolution sea-surface-temperature (SST) records at mid to high latitudes. Here we show that both Mg/Ca and oxygen isotope (δ 18 O) ratios in modern limpet (Patella) shells record the seasonal range of SST in the western Mediterranean -a region particularly susceptible to seasonal change. Analysis of a suite of fossil limpet shells from Gibraltar shows that SST seasonality was greater during the last glacial by~2°C as a result of greater winter cooling. These extra-tropical seasonal-resolution SST records for the last glacial suggest that the presence of large ice-sheets in the northern hemisphere enhances winter cooling. This result also indicates that seasonality in the Mediterranean is not well-represented in most palaeoclimate models, which typically show little change in seasonal amplitude, and provides a new test for the accuracy of climate models.

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“…More ex plic itly, the plank tonic foraminiferal fos sil re cord is of great im por tance to our un der stand ing palaeoceanography and re gional or global cli ma tic change through time, as they are sen si tive in di ca tors of sur face and near-sur face wa ter con di tions. On the other hand, Mg/Ca in ben thic foraminiferal spe cies has been used for ex am ple to rec og nize deep-sea temper a ture (T) changes (Mar tin et al, 2002;Marchitto et al, 2007) and Ce no zoic evo lu tion of global ice vol ume (Lear et al, 2002). Un for tu nately, data in ter pre ta tion and palaeoenvironmental recon struc tions still re main very chal leng ing, re flect ing the in complete knowl edge of the ecol ogy, phys i ol ogy and life cy cles in mod ern foraminifers, which can only be ob tained through field and lab o ra tory ob ser va tions (e.g., Bijma et al, 1990;Spero et al, 1997Spero et al, , 2015Rus sell et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Assessing the reliability of foraminiferal Mg/Ca thermometry by comparing field-samples and culture experiments: a review

Kontakiotis

Mortyn

Antonarakou

et al. 2016

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Benthic foraminiferal Mg/Ca-paleothermometry: a revised core-top calibration

Cited by 333 publications

References 31 publications

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Increased seasonality in the Western Mediterranean during the last glacial from limpet shell geochemistry

Assessing the reliability of foraminiferal Mg/Ca thermometry by comparing field-samples and culture experiments: a review

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