EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Transient Climate Simulations of Orbital Effects on Mesozoic Climates

Jan Landwehrs1,2, Georg Feulner2, Matteo Willeit2, Benjamin Sames1, and Michael Wagreich1
Jan Landwehrs et al.
  • 1Department of Geology, University of Vienna, Vienna, Austria (
  • 2Earth System Analysis, Potsdam Institute for Climate Impact Research, Potsdam, Germany

The Mesozoic era (~252—66 Ma) is traditionally considered as a prolonged greenhouse period, witnessing the breakup of the Pangaean supercontinent. Orbital cycles have, for example, been invoked as drivers of e.g. Pangaean „Megamonsoon“ variability and eustatic sea level cycles in the Mesozoic.

We aim to contribute to a more comprehensive understanding of orbital effects on Mesozoic climates by employing the newly developed CLIMBER-X Earth System Model. Here, we primarily use its coupled atmosphere, ocean, sea ice and vegetation modules, but also include preliminary tests with dynamic carbon cycle and ice-sheets. We present first results from a set of transient climate simulations of four Mesozoic timeslices representative for Triassic, Jurassic, Early Cretaceous and Late Cretaceous boundary conditions (e.g. paleogeography and solar luminosity). The simulations each cover ~100,000 years and are driven by changing precession, obliquity, and eccentricity.

We would like to use the opportunity to discuss this approach and associated questions with the community. For example: Would changing paleogeography and climate background state have modified the response to orbital forcings? Could eustatic sea level cycles have been caused by orbitally-driven redistribution of water between the ocean and land water storages or should orbitally-forced ice sheets also have played a role in the alleged Mesozoic greenhouse? Which connections can be established to proxy records?

How to cite: Landwehrs, J., Feulner, G., Willeit, M., Sames, B., and Wagreich, M.: Transient Climate Simulations of Orbital Effects on Mesozoic Climates, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-4093,, 2021.


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