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Accurate estimation of sea surface temperatures using dissolution‐corrected calibrations for Mg/Ca paleothermometry
Abstract
Paired δ 18 O and Mg/Ca measurements on the same foraminiferal shells offer the ability to independently estimate sea surface temperature (SST) changes and assess their temporal relationship to the growth and decay of continental ice sheets. The accuracy of this method is confounded, however, by the absence of a quantitative method to correct Mg/Ca records for alteration by dissolution. Here we describe dissolution‐corrected calibrations for Mg/Ca‐paleothermometry in which the preexponent constant is a function of size‐normalized shell weight: (1) for G. ruber (212–300 μm) (Mg/Ca)ruber = (0.025 wt + 0.11) e0.095 T and (b) for G. sacculifer (355–425 μm) (Mg/Ca)sacc = (0.0032 wt + 0.181) e0.095 T. The new calibrations improve the accuracy of SST estimates and are globally applicable. With this correction, eastern equatorial Atlantic SST during the Last Glacial Maximum is estimated to be 2.9° ± 0.4°C colder than today.
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Citations
Cites
Biological Controls on Coral Sr/Ca and δ 18 O Reconstructions of Sea Surface Temperatures
de Villiers, S., Nelson, B. K., & Chivas, A. R. (1995) · Science · doi:10.1126/science.269.5228.1247 · Cited by 291
Cited by
Erez, J. (2003) · Reviews in Mineralogy and Geochemistry · doi:10.2113/0540115 · Cited by 555
Koutavas, A., deMenocal, P. B., Olive, G. C., & Lynch-Stieglitz, J. (2006) · Geology · doi:10.1130/g22810a.1 · Cited by 307
Fallet, U., Boer, W., van Assen, C., Greaves, M., & Brummer, G. A. (2009) · Geochemistry, Geophysics, Geosystems · doi:10.1029/2009gc002573 · Cited by 25
Metadata
- Authors
- Rosenthal, Y., & Lohmann, G. P.
- Venue
- Paleoceanography
- Publisher
- American Geophysical Union (AGU)
- Published
- 2002-09
- Volume
- 17
- Issue
- 3
- ISSN
- 0883-8305 (ISSN-L)
- 1944-9186
- OpenAlex
- W1754578189
- Cited by
- 187
- References
- 1
- FWCI
- 5.92
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rosenthal, Y., & Lohmann, G. P. (2002). Accurate estimation of sea surface temperatures using dissolution‐corrected calibrations for Mg/Ca paleothermometry. Paleoceanography. https://doi.org/10.1029/2001pa000749
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