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On the role of the stratiform cloud scheme in the inter‐model spread of cloud feedback
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On the role of the stratiform cloud scheme in the inter‐model spread of cloud feedback
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Journal Article
On the role of the stratiform cloud scheme in the inter‐model spread of cloud feedback
2017
Overview
This study explores the role of the stratiform cloud scheme in the inter‐model spread of cloud feedback. Six diagnostic cloud schemes used in various CMIP (Coupled Model Intercomparison Experiment] climate models are implemented (at low and midlevels) into two testbed climate models, and the impacts on cloud feedback are investigated. Results suggest that the choice of stratiform cloud scheme may contribute up to roughly half of the intermodel spread of cloud radiative responses in stratocumulus (Sc) regions, and may determine or favor a given sign of the feedback there. Cloud schemes assuming a probability density function for total water content consistently predict a positive feedback in Sc regions in our experiments. A large negative feedback in Sc regions is obtained only with schemes that consider variables other than relative humidity (e.g., stability). The stratiform cloud scheme also significantly affects cloud feedback at the scale of the tropics and at global scale. Results are slightly less consistent for tropical means, likely indicating coupling with other boundary layer processes such as convective mixing. Key Points The stratiform cloud scheme plays an important role in the spread of cloud feedback, both in Sc regions and globally Subgrid PDF schemes tend to impose a positive low cloud feedback and stability dependence a negative feedback Stability dependence does not fully determine the sign of the feedback, including in marine stratus regions
Publisher
John Wiley & Sons, Inc,American Geophysical Union (AGU)
Subject
