Patterns and Mechanisms of Northeast Pacific Temperature Response to Pliocene Boundary Conditions
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Paleoceanog_and_Paleoclimatol_ ...
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Final Published Version
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Department of Geosciences, University of ArizonaIssue Date
2022
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John Wiley and Sons IncCitation
Brennan, P. R., Bhattacharya, T., Feng, R., Tierney, J. E., & Jorgensen, E. (2022). Patterns and Mechanisms of Northeast Pacific Temperature Response to Pliocene Boundary Conditions. Paleoceanography and Paleoclimatology, 37(7).Rights
Copyright © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 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
Ocean-atmosphere dynamics in the north Pacific play an important role in the global climate system and influence hydroclimate in western North America. However, changes to this region's mean climate under increased atmospheric greenhouse gas concentrations are not well understood. Here we present new alkenone-based records of sea surface temperature (SST) from the northeast Pacific from the mid-Piacenzian warm period (approximately 3.3–3.0 Ma), an interval considered to be an analog for near-future climate under middle-of-the-road anthropogenic emissions. We compare these and other alkenone-based SST records from the north Pacific to fully-coupled climate model simulations to examine the impact of mid-Pliocene CO2 and other boundary conditions on regional climate dynamics and to explore factors governing model disagreement about regional temperature patterns. Model performance varies regionally, with Community Earth System Model 1.2 (CESM 1.2) and CESM2 performing best in regions with greater warming like the California Margin, though these models underestimate the warming evidenced in our new proxy record and others from the region. Single forcing simulations reveal a strong influence for prescribed land surface changes and higher CO2 levels on coastal warming patterns along the California Margin in CESM2. Furthermore, differences in shortwave and longwave radiation and circulation between the models, likely related to changes in the atmospheric component of the model, may play a key role in the ability of models to capture regionally-varying patterns of Pliocene warmth. Regional patterns of temperature change inferred from geochemical records could therefore help to understand the impacts of different model parameterization schemes on regional climate patterns. © 2022. The Authors.Note
Open access articleISSN
2572-4517Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1029/2021PA004370
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Except where otherwise noted, this item's license is described as Copyright © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License.