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- W4310558268 abstract "Cloud Layers Unified By Binormals (CLUBB) adopts the joint probability density function (PDF) to close higher-order turbulence and diagnose the cloud fraction. CLUBB assumes the equal PDF width of vertical velocity () as the default closure scheme, called Analytic Double Gaussian 1 (ADG1). In this study, a new unequal width PDF closure scheme is adopted in CLUBB, in which the PDF width of is assumed to be associated with skewness and kurtosis of vertical velocity. Offline calculation shows that the updated closure scheme improves the tail in the joint PDF and produces the saturation area from the joint PDF of the total water and liquid water potential temperature closer to that derived from large-eddy simulations than ADG1. The new PDF scheme implemented in Community Atmosphere Model Version 6 is shown to increase low cloud fraction by 20%–30% in most stratocumulus-to-cumulus transition regions. The updated closure scheme is found to improve the low cloud simulation by simulating more symmetric turbulence in stratocumulus and stronger turbulent transport in shallow cumulus. Furthermore, the updated closure scheme enhances the cloud fraction near the cloud base by interacting with the microphysical scheme. Our work indicates the importance of continuous improvement in the PDF closures for higher-order turbulence schemes." @default.
- W4310558268 created "2022-12-12" @default.
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- W4310558268 date "2022-12-01" @default.
- W4310558268 modified "2023-09-26" @default.
- W4310558268 title "An Updated CLUBB PDF Closure Scheme to Improve Low Cloud Simulation in CAM6" @default.
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- W4310558268 doi "https://doi.org/10.1029/2022ms003127" @default.
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