报告题目：The differences between “1=1” and “3=3”: Nature’s feedback circuit within Earth’s climate system

报告专家：蔡鸣教授

报告时间：2024年05月11日（周六）10:00

报告地点：气象楼713会议室

主 持 人：虞越越 教授

专家简介：美国佛罗里达州立大学地球、海洋和大气科学系终身教授。1982年南京气象学院毕业，1990年获美国伊利诺伊大学博士学位。蔡鸣教授已发表SCI高影响因子论文100余篇，研究领域涵盖大气动力学和气候学。

报告摘要：

We here introduce a climate feedback kernel, referred to as the “energy gain kernel” (EGK). Elements of EGK are all positive, representing amplified energy perturbations at a layer where forcing is imposed and energy gained at other layers, both of which are achieved through radiative thermal coupling within an atmosphere-surface column. EGK functions as Nature’s climate feedback “circuit” for any energy input to the climate system, akin to H. S. Black’s pioneering electronic feedback circuit. EGK amplifies input energy perturbations at individual layers at an equal rate regardless of their origins, strength, and polarity. As the strength of EGK depends exclusively on climate mean states, it offers a solution for effectively and objectively separating control climate state information from climate perturbations for climate feedback studies. Given that an EGK comprises critical climate mean state information on mean temperature, water vapor, clouds, and surface pressure, we envision that the diversity of EGK across different climate models could provide insight into the inquiry of why, under the same anthropogenic greenhouse gas increase scenario, different models yield varying degrees of global mean surface warming.

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2024.04.28