Eocene simulations with iCESM1.2 (DeepMIP and more)

The early Eocene simulations were conducted by Jiang Zhu as part of CESM1.2’s contribution to the Deep-time Model Intercomparison Project (DeepMIP), funded by the Heising-Simons Foundation (PI: Prof. Chris Poulsen, University of Michigan).

The shared simulation suite includes those published in Zhu et al. (2019, 2020) and submitted to DeepMIP, as well as new simulations incorporating an improved river virtual flux formulation, as documented in Tierney et al. (2022). Additional orbital sensitivity simulations, also described in Tierney et al. (2022), are included.

An example case folder for modeling configurations is available on GitHub: https://github.com/jiang-zhu/icesm1.2_eocene_cheyenne

Simulation restart files are available on Zenodo: https://zenodo.org/records/12702135

Additional background and methodological details are provided in the following publications:

  • Zhu, J., Poulsen, C. J., & Tierney, J. E. (2019). Simulation of Eocene extreme warmth and high climate sensitivity through cloud feedbacks. Science Advances, 5(9), eaax1874. https://doi.org/10.1126/sciadv.aax1874
  • Zhu, J., Poulsen, C. J., Otto-Bliesner, B. L., Liu, Z., Brady, E. C., & Noone, D. C. (2020). Simulation of early Eocene water isotopes using an Earth system model and its implication for past climate reconstruction. Earth and Planetary Science Letters, 537, 116164. https://doi.org/10.1016/j.epsl.2020.116164
  • Tierney, J. E., Zhu, J., Li, M., Ridgwell, A., Hakim, G. J., Poulsen, C. J., Whiteford, R. D. M., Rae, J. W. B., & Kump, L. R. (2022). Spatial patterns of climate change across the Paleocene–Eocene Thermal Maximum. Proceedings of the National Academy of Sciences, 119(42), e2205326119. https://doi.org/10.1073/pnas.2205326119

We kindly ask that you reference the appropriate paper(s) and acknowledge the PaleoclimateWG and computing resources from NSF and NCAR CISL when presenting results based on these simulations in either oral or written form. 

Project Details

  • Simulation Names:
    • PI:  b.e12.B1850C5CN.f19_g16.iPI.01 (510 years) & b.e12.B1850C5CN.f19_g16.iPI.02 (200 years)
    • PI abrupt 4xCO2: b.e12.B1850C5CN.f19_g16.iPIx4.01 (1000 years)
    • Eocene 1xCO2: b.e12.B1850C5CN.f19_g16.iPETM01x.01 (2600 years) & b.e12.B1850C5CN.f19_g16.iPETM01x.01 (200 years)
    • Eocene 3xCO2: b.e12.B1850C5CN.f19_g16.iPETM03x.01 (2000 years) & b.e12.B1850C5CN.f19_g16.iPETM03x.02 (200 years)
      • Orbital sensitivity: b.e12.B1850C5CN.f19_g16.iPETM03x.OrbMaxN.01 (500 years) & b.e12.B1850C5CN.f19_g16.iPETM03x.OrbMaxS.01 (500 years) & b.e12.B1850C5CN.f19_g16.iPETM03x.OrbMin.01 (500 years)
    • Eocene 6xCO2: b.e12.B1850C5CN.f19_g16.iPETM06x.07 (2000 years) & b.e12.B1850C5CN.f19_g16.iPETM06x.09 (200 years)
      • Orbital sensitivity: b.e12.B1850C5CN.f19_g16.iPETM06x.OrbMaxN.01 (500 years) & b.e12.B1850C5CN.f19_g16.iPETM06x.OrbMaxS.01 (500 years) & b.e12.B1850C5CN.f19_g16.iPETM06x.OrbMin.01 (500 years)
    • Eocene 9xCO2: b.e12.B1850C5CN.f19_g16.iPETM09x.01 (2000 years) & b.e12.B1850C5CN.f19_g16.iPETM09x.02 (200 years)
  • Model Version: iCESM1.2_deeptime
  • Resolution: 1.9x2.5_gx1v6 (nominal 2° atmosphere/land and 1° ocean/sea ice)
  • Ensemble Size: one
  • Time Frequencies Saved: Monthly
  • Machine: NWSC Cheyenne
  • Compsets: B1850

Data Acquisition

On the NWSC computing storage at:

/glade/campaign/cesm/community/palwg/Eocene/iCESM1.2_deeptime

The data is also accessible via the Globus Guest Collection:

https://app.globus.org/file-manager?origin_id=b83d35bc-df03-40a9-bcba-2b99aec7f4bc&origin_path=%2F

Contact

Please direct questions/comments about this page to:

Jiang Zhu

Project Scientist

email