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Correlation Between Cloud Adjustments and Cloud Feedbacks Responsible for Larger Range of Climate Sensitivities in CMIP6
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2022
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Source: Journal of Geophysical Research: Atmospheres, 127(23)
[PDF-3.03 MB]
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Journal Title:Journal of Geophysical Research: Atmospheres
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Description:While the higher mean Equilibrium Climate Sensitivity (ECS) in CMIP6 has been attributed to more positive cloud feedbacks, it is unclear what causes the greater range of ECS values across CMIP6 models compared to CMIP5. Here, we investigate the relationship between radiative forcing and cloud feedbacks across the two model generations to explain the very high ECS values in some CMIP6 models. The relationship is sensitive to the definition of the forcing, particularly in CMIP6, but fixed-sea surface temperature simulations suggest the shortwave cloud feedback ( λSW,CL) is anticorrelated with the forcing in CMIP5 and either uncorrelated or weakly positively correlated with the forcing in CMIP6. These relationships reflect
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Source:Journal of Geophysical Research: Atmospheres, 127(23)
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ISSN:2169-897X;2169-8996;
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