Development and Evaluation of the Online Aerosol and Atmospheric Chemistry Model for the Chinese Academy of Sciences Earth System Model

The earth system model (ESM) is an important tool for analyzing global climate and ecological environment changes. The Aerosol and Atmospheric Chemistry Model (AACM) enables the simulation of gases and aerosols associated with the effects of climate change for further processing using the Atmospheric General Circulation Model (AGCM). On the basis of the Global Nested Grid Air Quality Prediction Model System, a simplified version of the AACM of the Institute of Atmospheric Physics (IAP-AACM) suitable for the ESM of the Chinese Academy of Sciences (CAS-ESM) is developed using a simplified gas-phase chemical mechanism. Not only anthropogenic aerosols but also natural aerosols and its precursors (e.g., sea salt, dust, and dimethyl sulfide) are considered. The evaluation showed that the IAP-AACM with simplified gas-phase chemical mechanism can reasonably simulate the spatial distribution of aerosols and precursor gases. The difference between the simplified version and the standard version with CBM-Z mechanism is small. The comparison of the obtained values with the observations shows that the simplified version captured the spatial distribution of aerosols and its precursors well and provided a reliable aerosol simulation for the IAP-AGCM in favor of two-way feedback. Furthermore, the simplified version can significantly improve the calculation efficiency and well satisfy the need for long-range integration of the CAS-ESM. To provide a more comprehensive aerosol simulation in the research on global climate change, the mechanism of nitrogen chemistry and the stratospheric chemistry of ozone will be considered in the IAP-AACM in the future.