Larger cloud liquid water enhances both aerosol indirect forcing and cloud radiative feedback in two Earth System Models

Previous studies have noticed that the Coupled Model Intercomparison Project Phase 6 (CMIP6) models with a stronger cooling from aerosol-cloud interactions (ACI) also have an enhanced warming from positive cloud feedback, and these two opposing effects are counter-balanced in simulations of the historical period. However, reasons for this anti-correlation are less explored. In this study, we perturb the cloud ice microphysical processes to obtain cloud liquid of varying amounts in two Earth System Models (ESMs). We find that the model simulations with a larger liquid water path (LWP) tend to have a stronger cooling from ACI and a stronger positive cloud feedback. More liquid clouds in the mean-state present more opportunities for anthropogenic aerosol perturbations and also weaken the negative cloud feedback at middle to high latitudes. This work, from a cloud state perspective, emphasizes the influence of the mean-state LWP on effective radiative forcing due to ACI (ERFACI).

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Related Dataset #1 : GEWEX NASA Water Vapor Project (NVAP)

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Author Zhao, X.
Liu, X.
Lin, L.
Qin, Y.
Zelinka, M. D.
Klein, S. A.
Zhang, M.
Zhang, K.
Ma, P.
Zhu, Jiang
Lu, Z.
Saravanan, R.
Publisher UCAR/NCAR - Library
Publication Date 2024-01-28T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-10T20:04:44.835905
Metadata Record Identifier edu.ucar.opensky::articles:26940
Metadata Language eng; USA
Suggested Citation Zhao, X., Liu, X., Lin, L., Qin, Y., Zelinka, M. D., Klein, S. A., Zhang, M., Zhang, K., Ma, P., Zhu, Jiang, Lu, Z., Saravanan, R.. (2024). Larger cloud liquid water enhances both aerosol indirect forcing and cloud radiative feedback in two Earth System Models. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7bc43pr. Accessed 01 August 2025.

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