Tropical Precipitation Woes in the Community Earth System Model Version 2
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Tropical_Precipitation_System_ ...
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Final Published Version
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Department of Geosciences, University of ArizonaIssue Date
2023-10-31
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John Wiley and Sons IncCitation
Lofverstrom, M., & Zhu, J. (2023). Tropical precipitation woes in the Community Earth System Model version 2. Geophysical Research Letters, 50(21), e2023GL104416. https://doi.org/10.1029/2023GL104416Journal
Geophysical Research LettersRights
© 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The newly developed paleo-climate calibrated Community Earth System Model, version 2 (pCESM2) simulates a more realistic global temperature response to external forcing compared to the standard CESM2. Here we show that the code modifications in pCESM2 result in increased atmospheric convection and a northward shift of the Atlantic and eastern Pacific Intertropical Convergence Zones. These changes are exacerbated under Last Glacial Maximum forcing, resulting in tropical precipitation changes that are inconsistent with both proxy data evidence and simulations with other contemporary models. Similar model-data disagreements are also present in the standard CESM2. Thus, more work is needed to improve the simulated Last Glacial Maximum hydroclimate response in CESM2. We further suggest that well-constrained paleo climates should be given a larger emphasis in model development more broadly, as these climates can help identify issues with model parameterizations under altered forcing and thus improve the fidelity of simulations of past, present, and future climates. © 2023. The Authors.Note
Open access journalISSN
0094-8276Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1029/2023GL104416
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Except where otherwise noted, this item's license is described as © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License.