Open AccessDescription and Climate Simulation Performance of CAS‐ESM Version 2
Author(s) -
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,
Kong Xianghui,
Li Shigang,
Li Yangchun,
Lin Pengfei,
Lin Zhaohui,
Liu Hailong,
Liu Xiaohong,
Shi Ying,
Song Mirong,
Wang Huijun,
Wang Tianyi,
Wang Xiaocong,
Wang Zifa,
Wei Ying,
Wu Baodong,
Xie Zhenghui,
Xu Yongfu,
Yu Yongqiang,
Yuan Liang,
Zeng Qingcun,
Zeng Xiaodong,
Zhao Shuwen,
Zhou Guangqing,
Zhu Jiang
Publication year - 2020
Publication title -
journal of advances in modeling earth systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.03
H-Index - 58
ISSN - 1942-2466
DOI - 10.1029/2020ms002210
Subject(s) - intertropical convergence zone , climatology , climate model , environmental science , atmospheric model , atmosphere (unit) , precipitation , climate sensitivity , atmospheric sciences , global warming , coupled model intercomparison project , climate change , meteorology , geology , geography , oceanography
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.