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To obtain physical insights into the response and feedback of low clouds (Cl) to global warming, ensemble 4 × CO2 experiments were carried out with two climate models, the Model for Interdisciplinary Research on Climate (MIROC) versions 3.2 and 5. For quadrupling CO2, tropical-mean Cl decreases, and hence, acts as positive feedback in MIROC3, whereas it increases and serves as negative feedback...
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