Submitted as: model description paper 26 Oct 2020

Submitted as: model description paper | 26 Oct 2020

Review status: this preprint is currently under review for the journal GMD.

BCC-CSM2-HR: A High-Resolution Version of the Beijing Climate Center Climate System Model

Tongwen Wu1, Rucong Yu1, Yixiong Lu1, Weihua Jie1, Yongjie Fang1, Jie Zhang1, Li Zhang1, Xiaoge Xin1, Laurent Li1,2, Zaizhi Wang1, Yiming Liu1, Fang Zhang1, Fanghua Wu1, Min Chu1, Jianglong Li1, Weiping Li1, Yanwu Zhang1, Xueli Shi1, Wenyan Zhou1, Junchen Yao1, Xiangwen Liu1, He Zhao1, Jinghui Yan1, Min Wei3, Wei Xue4, Anning Huang5, Yaocun Zhang5, Yu Zhang6, and Qi Shu7 Tongwen Wu et al.
  • 1Beijing Climate Center, China Meteorological Administration, Beijing, China
  • 2Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, Ecole Normale Supérieure, Ecole Polytechnique, Paris 75005, France
  • 3National Meteorological Information Center, China Meteorological Administration, Beijing 100081, China
  • 4Tsinghua University, Beijing 100084, China
  • 5Nanjing University, Nanjing 210023, China
  • 6Chengdu University of Information Technology, Chengdu 610225, China
  • 7The First Institute of Oceanography of the Ministry of Natural Resources, Qingdao 266061, China

Abstract. BCC-CSM2-HR is a high-resolution version of the Beijing Climate Center (BCC) Climate System Model. Its development is on the basis of the medium-resolution version BCC-CSM2-MR which is the baseline for BCC participation to the Coupled Model Intercomparison Project Phase 6 (CMIP6). This study documents the high-resolution model, highlights major improvements in the representation of atmospheric dynamic core and physical processes. BCC-CSM2-HR is evaluated for present-day climate simulations from 1971 to 2000, which are performed under CMIP6-prescribed historical forcing, in comparison with its previous medium-resolution version BCC-CSM2-MR. We focus on basic atmospheric mean states over the globe and variabilities in the tropics including the tropic cyclones (TCs), the El Niño–Southern Oscillation (ENSO), the Madden-Julian Oscillation (MJO), and the quasi-biennial oscillation (QBO) in the stratosphere. It is shown that BCC-CSM2-HR keeps well the global energy balance and can realistically reproduce main patterns of atmosphere temperature and wind, precipitation, land surface air temperature and sea surface temperature. It also improves in the spatial patterns of sea ice and associated seasonal variations in both hemispheres. The bias of double intertropical convergence zone (ITCZ), obvious in BCC-CSM2-MR, is almost disappeared in BCC-CSM2-HR. TC activity in the tropics is increased with resolution enhanced. The cycle of ENSO, the eastward propagative feature and convection intensity of MJO, the downward propagation of QBO in BCC-CSM2-HR are all in a better agreement with observation than their counterparts in BCC-CSM2-MR. We also note some weakness in BCC-CSM2-HR, such as the excessive cloudiness in the eastern basin of the tropical Pacific with cold Sea Surface Temperature (SST) biases and the insufficient number of tropical cyclones in the North Atlantic.

Tongwen Wu et al.

Status: open (extended)
Status: open (extended)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Tongwen Wu et al.

Data sets

BCC BCC-CSM2HR model output prepared for CMIP6 HighResMIP hist-1950 W. Jie et al.

Model code and software

Source code for Wu et al, "BCC-CSM2-HR: A High-Resolution Version of the Beijing Climate Center Climate System Model", GMD publication T. Wu, R. Yu, Y. Lu, W. Jie et al.

Tongwen Wu et al.


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Short summary
This paper was devoted to the presentation of the high-resolution version BCC-CSM2-HR and to the description of its climate simulation performance including the atmosphere temperature and wind, precipitation, and the tropical climate such as TC, MJO, QBO and ENSO. BCC-CSM2-HR is our model version participating to the HighResMIP. We focused on its updating and differential characteristics from its predecessor, the medium-resolution version BCC-CSM2-MR.