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- Title
Description and Climate Simulation Performance of CAS‐ESM Version 2.
- Authors
Zhang, He; Zhang, Minghua; Jin, Jiangbo; Fei, Kece; Ji, Duoying; Wu, Chenglai; Zhu, Jiawen; He, Juanxiong; Chai, Zhaoyang; Xie, Jinbo; Dong, Xiao; Zhang, Dongling; Bi, Xunqiang; Cao, Hang; Chen, Huansheng; Chen, Kangjun; Chen, Xueshun; Gao, Xin; Hao, Huiqun; Jiang, Jinrong
- Abstract
The second version of Chinese Academy of Sciences Earth System Model (CAS‐ESM 2) is described with emphasis on the development process, strength and weakness, and climate sensitivities in simulations of the Coupled Model Intercomparison Project (CMIP6) DECK experiments. CAS‐ESM 2 was built as a numerical model to simulate both the physical climate system as well as atmospheric chemistry and carbon cycle. It is a newcomer in the international modeling community to provide sufficiently independent solutions of climate simulations from those of other models. Performances of the model in simulating the basic states of the radiation budget of the atmosphere and ocean, precipitation, circulations, variabilities, and the twentieth century warming are presented. Model biases and their possible causes are discussed. Strength includes horizontal heat transport in the atmosphere and oceans, vertical profile of the Atlantic Meridional Overturning Circulation; weakness includes the double intertropical convergence zone (ITCZ) and stronger amplitude of the El Niño–Southern Oscillation (ENSO) that are also common in many other models. The simulated the twentieth century warming shares a similar discrepancy with observations as in several other models—less warming in the 1920s and stronger cooling in the 1960s than in observation—at the time when there was a steep increase of anthropogenic aerosols. As a result, the twentieth century warming is about 60% of the observed warming despite that the model simulated a similar slope of warming trend after 1980 to observation. The model has an equilibrium climate sensitivity of 3.4 K with a positive cloud feedback from the shortwave radiation. Plain Language Summary: This paper describes the second version of Chinese Academy of Sciences Earth System Model (CAS‐ESM 2) along with simulation results from the Coupled Model Intercomparison Project (CMIP6) DECK experiments. Performances of the model in simulating the radiation budget of the atmosphere and ocean, precipitation, circulations, variabilities, and the twentieth century warming are presented. The simulated the twentieth century warming shares a similar discrepancy with observations as in several other models—less warming in the 1920s and stronger cooling in the 1960s than in observation—at the time when there was a steep increase of anthropogenic aerosols. As a result, the twentieth century warming is about 60% of the observed warming despite that the model simulated a similar slope of warming trend after 1980 to observation. Key Points: The second version of Chinese Academy of Sciences Earth System Model (CAS‐ESM 2) is describedStrength and weakness of the model simulations from the CMIP6 DECK experiments are described along possible causesThe model has an equilibrium climate sensitivity of 3.4 K with a positive cloud feedback from the shortwave radiation
- Subjects
CHINESE Academy of Sciences (Beijing, China); EARTH system science; CLIMATE sensitivity; INTERTROPICAL convergence zone; EL Nino; MERIDIONAL overturning circulation
- Publication
Journal of Advances in Modeling Earth Systems, 2020, Vol 12, Issue 12, p1
- ISSN
1942-2466
- Publication type
Article
- DOI
10.1029/2020MS002210