Southern high-latitude warmth during the Jurassic–Cretaceous: New evidence from clumped isotope thermometry
Open accessAbstract
In order to understand the climate dynamics of the Mesozoic greenhouse world, it is vital to determine paleotemperatures from higher latitudes. For the Jurassic and Cretaceous climate, there are significant discrepancies between different proxies and between proxy data and climate models. We determined paleotemperatures from Late Jurassic and Early Cretaceous belemnites using the carbonate clumped isotope paleothermometer and compared these values to temperatures derived from TEX86 and other proxies. From our analyses, we infer an average temperature of ∼25 °C for the upper part of the water column of the southern Atlantic Ocean. Our data imply that for mid- to high latitudes, climate models underestimate marine temperatures by >5 °C and, therefore, the amount of warming that would accompany an increase in atmospheric CO2 of more than 4× pre-industrial levels, as is projected for the near future.
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Middle-Late Jurassic belemnite habitats, at least for Cylindroteuthis and Pachyteuthis, were pelagic, within the upper 200 m of the water column.
“These clumped isotope temperatures therefore support the interpretation that Middle-Late Jurassic belemnite habitats, at least for the two genera examined here, were pelagic, i.e. within the upper 200 m of the water column (e.g. in the photic zone, Klug et al., 2016; Vickers et al., 2019; Hoffmann and Stevens, 2019).”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Vickers et al., 2019
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Calibration of the dual clumped isotope thermometer for carbonates
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- Authors
- Vickers, M. L., Bajnai, D., Price, G. D., Linckens, J., & Fiebig, J.
- Affiliations
- University of Copenhagen (DK)
- Goethe University Frankfurt (DE)
- University of Plymouth (GB)
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2019-05-31
- Volume
- 47
- Issue
- 8
- Pages
- 724-728
- ISSN
- 0091-7613 (ISSN-L)
- OpenAlex
- W2948830269
- Cited by
- 46
- References
- 8
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 6 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 10
- FWCI
- 5.91
- Type
- journal article
- Language
- en
- Open access
- Licence
- other-oa
- Locations
- Geology (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, other-oa)
- PEARL (University of Plymouth) (submittedVersion)
- Funders
- Imperial College London
- University of Oxford
- European Commission (643084)
- Durham University
- Senckenberg Biodiversität und Klima Forschungszentrum
- Natural Environment Research Council (NE/J020842/1)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Keywords
- clumped isotope thermometry, belemnites, TEX86, Southern Atlantic Ocean, climate model bias, atmospheric CO2 increase, paleoclimate proxies
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