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Impact of Turbulence on the Relationship between Cloud Feedback and Aerosol-Cloud Interaction in an E3SMv2 Perturbed Parameter Ensemble
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  • Yi Qin,
  • Po-Lun Ma,
  • Mark D. Zelinka,
  • Stephen A. Klein,
  • Tao Zhang,
  • Xue Zheng,
  • Vincent E Larson,
  • Meng Huang
Yi Qin
Pacific Northwest National Laboratory

Corresponding Author:[email protected]

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Po-Lun Ma
Pacific Northwest National Laboratory (DOE)
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Mark D. Zelinka
Lawrence Livermore National Laboratory (DOE)
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Stephen A. Klein
Lawrence Livermore National Laboratory (DOE)
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Tao Zhang
Brookhaven National Laboratory
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Xue Zheng
Lawrence Livermore National Laboratory (DOE)
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Vincent E Larson
University of Wisconsin-Milwaukee
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Meng Huang
Pacific Northwest National Laboratory
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Abstract

Recent studies reveal an anti-correlation between global cloud feedback (CF) and effective radiative forcing due to aerosol-cloud interaction (ERFaci) in climate models, but its physical plausibility remains uncertain. Here we investigate whether different turbulence representations, specifically through perturbing turbulence parameters, contribute to this relationship over the global ocean using an E3SMv2 perturbed parameter ensemble. The anti-correlation appears only in the tropical ascent regime. In the Northern Hemisphere midlatitude and high latitude regimes, there is no significant correlation, and in the tropical marine low cloud and Southern Ocean regimes, the correlation is positive. These opposite correlations are primarily driven by opposing CF responses to perturbed parameters. We find that the mean-state turbulent mixing strength affects both CF and ERFaci, enabling strong correlations in certain regimes. This study highlights the complex linkages between CF and ERFaci through turbulent processes across diverse cloud regimes.
08 Oct 2024Submitted to ESS Open Archive
10 Oct 2024Published in ESS Open Archive