Articles | Volume 18, issue 3
https://doi.org/10.5194/cp-18-435-2022
https://doi.org/10.5194/cp-18-435-2022
Research article
 | 
04 Mar 2022
Research article |  | 04 Mar 2022

Clumped isotope evidence for Early Jurassic extreme polar warmth and high climate sensitivity

Thomas Letulle, Guillaume Suan, Mathieu Daëron, Mikhail Rogov, Christophe Lécuyer, Arnauld Vinçon-Laugier, Bruno Reynard, Gilles Montagnac, Oleg Lutikov, and Jan Schlögl

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Multi-proxy assessment of brachiopod shell calcite as a potential archive of seawater temperature and oxygen isotope composition
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Cited articles

Anderson, N. T., Kelson, J. R., Kele, S., Daëron, M., Bonifacie, M., Horita, J., Mackey, T. J., John, C. M., Kluge, T., Petschnig, P., Jost, A. B., Huntington, K. W., Bernasconi, S. M., and Bergmann, K. D.: A unified clumped isotope thermometer calibration (0.5–1100 C) using carbonate-based standardization, Geophys. Res. Lett., 38, e2020GL092069, https://doi.org/10.1029/2020GL092069, 2021. 
Baghli, H., Mattioli, E., Spangenberg, J. E., Bensalah, M., Arnaud-Godet, F., Pittet, B., and Suan, G.: Early Jurassic climatic trends in the south-Tethyan margin, Gondwana Res., 77, 67–81, https://doi.org/10.1016/j.gr.2019.06.016, 2020. 
Barrick, R. E., Fischer, A. G., and Showers, W. J.: Oxygen isotopes from turtle bone; applications for terrestrial paleoclimates?, PALAIOS, 14, 186–191, https://doi.org/10.2307/3515374, 1999. 
Bernasconi, S. M., Müller, I. A., Bergmann, K. D., Breitenbach, S. F. M., Fernandez, A., Hodell, D. A., Jaggi, M., Meckler, A. N., Millan, I., and Ziegler, M.: Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate-Based Standardization, Geochem. Geophy. Geosy., 19, 2895–2914, https://doi.org/10.1029/2017GC007385, 2018. 
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In this study, we applied geochemical tools to well-preserved ∼180-million-year-old marine mollusc shells from polar and mid-latitude seas. These results indicate that polar shells grew at temperatures of 8–18°C, while mid-latitude shells grew at temperatures of 24–28°C. These results, together with previously published data, raise concerns about the ability of climate models to predict accurate polar temperatures under reasonably high atmospheric CO2 levels.
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