Buffering of aerosol-cloud adjustments by coupling between radiative susceptibility and precipitation efficiency

Aerosol-cloud interactions (ACI) in warm clouds are the primary source of uncertainty in effective radiative forcing (ERF) during the historical period and, by extension, inferred climate sensitivity. The ERF due to ACI (ERFaci) is composed of the radiative forcing due to changes in cloud microphysics and cloud adjustments to microphysics. Here, we examine the processes that drive ERFaci using a perturbed parameter ensemble (PPE) hosted in CAM6. Observational constraints on the PPE result in substantial constraints in the response of cloud microphysics and macrophysics to anthropogenic aerosol, but only minimal constraint on ERFaci. Examination of cloud and radiation processes in the PPE reveal buffering of ERFaci by the interaction of precipitation efficiency and radiative susceptibility.

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Author Song, C.
McCoy, D. T.
Eidhammer, Trude
Gettelman, A.
McCoy, I. L.
Watson-Parris, D.
Wall, C. J.
Elsaesser, G.
Wood, R.
Publisher UCAR/NCAR - Library
Publication Date 2024-06-16T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-10T20:01:11.399365
Metadata Record Identifier edu.ucar.opensky::articles:27284
Metadata Language eng; USA
Suggested Citation Song, C., McCoy, D. T., Eidhammer, Trude, Gettelman, A., McCoy, I. L., Watson-Parris, D., Wall, C. J., Elsaesser, G., Wood, R.. (2024). Buffering of aerosol-cloud adjustments by coupling between radiative susceptibility and precipitation efficiency. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7vh5t2s. Accessed 09 August 2025.

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