Brewer-Dobson（BD）环流是全球尺度的质量环流，影响大气成分分布、调节大气辐射收支和化学过程。但是目前关于人类排放对BD环流影响的研究主要聚焦于温室气体的辐射气候效应，而没有考虑大气辐射和化学活性成分的化学-辐射-动力反馈过程，且没有考虑热带海温（SST）的耦合作用。研究大气化学-辐射-动力反馈过程，特别是平流层内的这种反馈过程，对于深入理解人类排放对BD环流的影响具有重要意义。东亚地区作为人类排放和气候变化的敏感区域之一，其排放变化对BD环流会产生多大的影响目前并不清楚。针对以上问题，本项目拟使用耦合的大气化学气候模式进行模拟，诊断人类排放温室气体增加与热带SST耦合的化学-辐射-动力反馈作用，特别是N2O、CH4等重要化学活性温室气体排放增加对BD环流的影响，着重分析东亚地区人类排放的化学-辐射-动力反馈过程对BD环流的影响，揭示其中的影响机制。项目研究内容具有特色和创新。

The Brewer-Dobson (BD) circulation is a global-scale mass circulation, which plays an important role in the atmospheric tracers distribution, modulation of radiation and chemical processes. However most study about the BD circulation change effects of anthropogenic emission focus on the irradiation effect of greenhouse gases (GHG), the chemical-radiative-dynamical feedbacks in the atmosphere of the chemically active gases are not well resolved, and the effect of coupled tropical sea surface temperature (SST) is not addressed. Study of chemical-radiative-dynamical feedbacks in the atmosphere, particularly in the stratosphere, is important for better understanding the BD circulation change effects of anthropogenic emission. As a sensitive area of anthropogenic emission and climate change, the influence of emission change over East Asia area on the BD circulation have not been well resolved. The project will use a coupled atmospheric chemistry-climate model to study the chemical-radiative-dynamical feedbacks on the BD circulation of the chemically active gases and tropical SST, particularly the important chemically active gases such as N2O and CH4. Furthermore we will study the BD circulation change effecting by the emission over the East Asia area. Overall, this project is unique and innovative.