[A-CG32] Climate Variability and Predictability on Subseasonal to Centennial Timescales

[ACG32-09] Intermodel comparison in relationships between externally and internally forced radiative feedbacks for CMIP6 simulations

*土田 耕¹、望月 崇¹、川村 隆一¹、川野 哲也¹ (1.九州大学)

キーワード：気候感度、放射フィードバック、雲フィードバック

We have investigated the radiative feedbacks based on the simulations forced by an abrupt quadrupling of CO₂ and the pre-industrial control (piControl) simulations for the coupled model intercomparison project phase 6, and clarified their relationships among the models. Considering the lead-lag relationships inherent in models between global means of surface temperature and net radiation at the top of the atmosphere in piControl simulations, the radiative feedbacks estimated by two simulations are highly correlated in a group of the models with small lags. It can be attributed to the rate of equatorial sea surface temperature rise and related equatorial negative cloud feedback strength. In contrast, models with large lags mostly have positive cloud feedback on the east Pacific as well as the central equatorial Pacific, leading to less correlated radiative feedbacks among the models.