Cited by 128Geology and Paleoclimatology ResearchPaleontology and Stratigraphy of FossilsClimate variability and models

Simulation of modern and middle Cretaceous marine δ18O with an ocean‐atmosphere general circulation model

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Zhou, J., Poulsen, C. J., Pollard, D., White, T. S.·2008·Paleoceanography

Abstract

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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  1. Wilson, P. A., R. D. Norris, and M. J. Cooper (2002), Testing the Cretaceous greenhouse hypothesis using glassy foraminiferal calcite from the core of the Turonian tropics on Demerara Rise, Geology, 30, 607 -610, doi:10.1130/0091-7613(2002)030<0607: TTCGHU>2.0.CO;2. · DOI

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Authors
Zhou, J., Poulsen, C. J., Pollard, D., & White, T. S.
Affiliations
  • University of Michigan (US)
  • Pennsylvania State University (US)
Venue
Paleoceanography
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
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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