Gettelman ECS data

The Community Earth System Model Version 2 (CESM2) has a Equilibrium Climate Sensitivity (ECS) of 5.3K. 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 which 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 20th 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 to 4.5K, is plausible.

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Resource Format NetCDF
Standardized Resource Format NetCDF
Asset Size 412460.666 MB
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Distributor NSF NCAR Geoscience Data Exchange
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Author Gettelman, A.
Publisher NSF National Center for Atmospheric Research
Publication Date 2019-07-25
Digital Object Identifier (DOI) https://doi.org/10.26024/zrad-5z41
Alternate Identifier d651015
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2025-10-09T01:35:42Z
Metadata Record Identifier edu.ucar.gdex::d651015
Metadata Language eng; USA
Suggested Citation Gettelman, A.. (2019). Gettelman ECS data. NSF National Center for Atmospheric Research. https://doi.org/10.26024/zrad-5z41. Accessed 12 October 2025.

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