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Simulation of modern and middle Cretaceous marine δ18O with an ocean‐atmosphere general circulation model
Open accessAbstract
We have developed a coupled ocean‐atmosphere general circulation model, the GENESIS‐MOM model, with the ability to transport and fractionate water isotopes in the ocean and atmosphere. The model is used to predict modern and Cretaceous precipitation and seawater δ18 O. The model reproduces the large‐scale modern‐day isotopic distribution. In the zonal mean, the difference between simulated and observed seawater δ18 O is within 0.2‰ in the low and middle latitudes and within 1‰ at high latitudes. In comparison to modern, simulated Cretaceous surface seawater δ18 O is systematically depleted by 0.3‰ at low and middle latitudes. These differences are attributed to equilibrium fractionation during surface evaporation at low latitudes and an increased partitioning of 18 O from the surface into the deep ocean due to intermediate and deep water formation in subtropical basins in the Cretaceous. We also find that regional seawater δ18 O is significantly influenced by the paleobathymetry and the resolution of oceanic gateways, boundary conditions that are not well known for the past. Our simulation of Cretaceous seawater δ18 O has major implications for oxygen isotope paleothermometry. We conclude that conventional assumptions of past seawater δ18 O may lead to an overestimate of Cretaceous sea‐surface temperatures, especially at middle and high latitudes.
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“GCM models for the Mesozoic return a large spread from very light values (e.g. as low as -7 ‰) for the semi-enclosed Boreal Ocean, and relatively heavy values (e.g. 0 to 0.5 ‰) for the Tethys ocean in an ice-free world (Zhou et al., 2008, Cretaceous simulation).”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Zhou et al., 2008
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“and ancient oceans are likely to have exhibited the same heterogeneity (e.g. Zhou et al., 2008).”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Zhou et al., 2008
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“For a greenhouse Earth, with global average δ 18 Osw of -1 ‰ (Shackleton and Kennett, 1975), this high value is even more unlikely in any ocean-connected basin (e.g. Zhou et al., 2008)”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Zhou et al., 2008
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Metadata
- Authors
- Zhou, J., Poulsen, C. J., Pollard, D., & White, T. S.
- Affiliations
- University of Michigan (US)
- Pennsylvania State University (US)
- Venue
- Paleoceanography
- Publisher
- American Geophysical Union (AGU)
- Published
- 2008-09
- Volume
- 23
- Issue
- 3
- ISSN
- 0883-8305 (ISSN-L)
- 1944-9186
- OpenAlex
- W1487236323
- Cited by
- 128
- References
- 51
- Citations by year
- 2026: 3 · 2025: 6 · 2024: 5 · 2023: 13 · 2022: 8 · 2021: 12 · 2020: 15 · 2019: 3 · 2018: 4 · 2017: 4 · 2016: 3 · 2015: 8 · 2014: 3 · 2013: 10 · 2012: 13
- FWCI
- 3.80
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Paleoceanography (publishedVersion)
- Deep Blue (University of Michigan) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Keywords
- seawater oxygen isotopes, Cretaceous climate, mid-Cretaceous, precipitation isotopes, deep water formation, paleobathymetry, ocean gateways, sea surface temperature, surface evaporation
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