Buffering of Aerosol‐Cloud Adjustments by Coupling Between Radiative Susceptibility and Precipitation Efficiency

Song, Ci; McCoy, Daniel T.; Eidhammer, Trude; Gettelman, Andrew; McCoy, Isabel L.; Watson‐Parris, Duncan; Wall, Casey J.; Elsaesser, Gregory; Wood, Robert

doi:10.1029/2024GL108663

Title: Buffering of Aerosol‐Cloud Adjustments by Coupling Between Radiative Susceptibility and Precipitation Efficiency

Journal Article · 05 June 2024 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2024GL108663 · OSTI ID:2371049

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Department of Atmospheric Science University of Wyoming Laramie WY USA
NSF National Center for Atmospheric Research Boulder CO USA
Pacific Northwest National Laboratory Richland WA USA
Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA, Chemical Sciences Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
Scripps Institution of Oceanography and Halicioğlu Data Science Institute University of California San Diego La Jolla CA USA
Department of Geosciences University of Oslo Oslo Norway
Columbia University New York NY USA, NASA Goddard Institute for Space Studies New York NY USA
Department of Atmospheric Sciences University of Washington Seattle WA USA

Abstract 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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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0024161

OSTI ID:: 2371049

Alternate ID(s):: OSTI ID: 2371564; OSTI ID: 2396979; OSTI ID: 2475167

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 11 Vol. 51; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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