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High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2)

Open access
Gettelman, A., Hannay, C., Bacmeister, J. T., Neale, R. B., Pendergrass, A. G., Danabasoglu, G., Lamarque, J.‐F., Fasullo, J. T., Bailey, D. A., Lawrence, D. M., Mills, M. J.·2019·Geophysical Research Letters

Abstract

The Community Earth System Model Version 2 (CESM2) has an equilibrium climate sensitivity (ECS) of 5.3 K. ECS is an emergent property of both climate feedbacks and aerosol forcing. The increase in ECS over the previous version (CESM1) is the result of cloud feedbacks. Interim versions of CESM2 had a land model that damped ECS. Part of the ECS change results from evolving the model configuration to reproduce the long‐term trend of global and regional surface temperature over the twentieth century in response to climate forcings. Changes made to reduce sensitivity to aerosols also impacted cloud feedbacks, which significantly influence ECS. CESM2 simulations compare very well to observations of present climate. It is critical to understand whether the high ECS, outside the best estimate range of 1.5–4.5 K, is plausible.

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Metadata

Authors
Gettelman, A., Hannay, C., Bacmeister, J. T., Neale, R. B., Pendergrass, A. G., Danabasoglu, G., Lamarque, J. ‐., Fasullo, J. T., Bailey, D. A., Lawrence, D. M., & Mills, M. J.
Venue
Geophysical Research Letters
Published
2019-07-22
Volume
46
Issue
14
Pages
8329-8337
ISSN
  • 0094-8276 (ISSN-L)
  • 1944-8007
OpenAlex
W2960797162
Cited by
481
References
50
FWCI
29.66
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2). https://app.cochat.ai/papers/10.1029/2019gl083978
The paper
Gettelman, A., Hannay, C., Bacmeister, J. T., Neale, R. B., Pendergrass, A. G., Danabasoglu, G., Lamarque, J. ‐., Fasullo, J. T., Bailey, D. A., Lawrence, D. M., & Mills, M. J. (2019). High Climate Sensitivity in the Community Earth System Model Version 2 (CESM2). Geophysical Research Letters. https://doi.org/10.1029/2019gl083978

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.