Abstract
A team effort to develop a Community Integrated Earth System Model (CIESM) was initiated in China in 2012. The model was based on NCAR Community Earth System Model (Version 1.2.1) with several novel developments and modifications aimed to overcome some persistent systematic biases, such as the double Intertropical Convergence Zone problem and underestimated marine boundary layer clouds. Aerosols' direct and indirect effects are prescribed using the MACv2-SP approach and data sets. The spin-up of a 500-year preindustrial simulation and three historical simulations are described and evaluated. Prominent improvements include alleviated double Intertropical Convergence Zone problem, increased marine boundary layer clouds, and better El Niño Southern Oscillation amplitude and periods. One deficiency of the model is the significantly underestimated Arctic and Antarctic sea ice in warm seasons. The historical warming is about 0.55 °C greater than observations toward 2014. CIESM has an equilibrium climate sensitivity of 5.67 K, mainly resulted from increased positive shortwave cloud feedback. Our efforts on porting and redesigning CIESM for the heterogeneous Sunway TaihuLight supercomputer are also introduced, including some ongoing developments toward a future version of the model.
| Original language | English |
|---|---|
| Article number | e2019MS002036 |
| Journal | Journal of Advances in Modeling Earth Systems |
| Volume | 12 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 1 2020 |
| Externally published | Yes |
Funding
This work would not be possible without the continuous coordination and encouragement of Professor Xu Guanghua, who has devoted himself to push forward the global change program and Earth system model development in China and particularly at Tsinghua University for more than 12 years. This work was supported by Tsinghua University Initiative Scientific Research Program. Computing and data storage resources were provided by National Supercomputing Center in Wuxi. We thank Qi Tang and Jean-Christophe Golaz for the help with Figure 10. We thank all the scientists and software engineers who contributed to the CESM1.2.1, which served as the base for the CIESM development. The development of CIESM benefited from a large number of people, both within and outside Tsinghua, beyond the list of authors of this work. This work would not be possible without the continuous coordination and encouragement of Professor Xu Guanghua, who has devoted himself to push forward the global change program and Earth system model development in China and particularly at Tsinghua University for more than 12 years. This work was supported by Tsinghua University Initiative Scientific Research Program. Computing and data storage resources were provided by National Supercomputing Center in Wuxi. We thank Qi Tang and Jean‐Christophe Golaz for the help with Figure 10 . We thank all the scientists and software engineers who contributed to the CESM1.2.1, which served as the base for the CIESM development. The development of CIESM benefited from a large number of people, both within and outside Tsinghua, beyond the list of authors of this work.
Keywords
- Community Integrated Earth System Model
- coupled model evaluation
- preindustrial and historical simulations