Models - Atmospheric Model

BCC_AGCM2.0 originates from the community atmospheric model version 3 (CAM3) developed by the National Center for Atmospheric Research(NCAR). The dynamics in BCC_AGCM2.0 is substantially different from the Eulerian spectral formulation of the dynamical equations in CAM3. The dynamical core of BCC_AGCM2.0 is reference atmosphere described in Wu et al.(2008), which demonstrated that the use of a reference atmosphere can substantially improve the calculation of pressure gradient force and thus model performance at regional and global scales, especially for the tropospheric temperature and winds. Several new physical parameterizations (Wu,2010) have been applied to replace the corresponding original ones.

The major modifications of the model physics in BCC_AGCM2.0 include
(1) A new convection scheme, which is generated from the Zhang and McFarlane’s scheme but modified (Zhang and Mu, 2005),
(2) A dry adiabatic adjustment scheme (Yan H. 1987) in which potential temperature is conserved,
(3) A modified scheme to calculate the sensible heat and moisture fluxes over the open ocean which takes into account the effect of ocean waves on the latent and sensible heat fluxes,
(4) An empirical equation to compute the snow cover fraction (Wu T. and Wu G. 2004).
The model equations are formulated in a horizontal T42 spectral resolution (approximately 2.8°latitude ×2.8°longitude grid) and a terrain-following hybrid vertical coordinate with 26 levels and a rigid lid at 2.914mb.


Wu T, Wu G (2004) An empirical formula to compute snow cover fraction in GCMs. Adv.Atmos.Sci., 21:529–535. doi:10.1007/BF02915720.
Wu T, Yu R, Zhang F (2008) A modified dynamic framework for atmospheric spectral model and its application. J.Atmos.Sci., 65:2235–2253. doi:10.1175/2007JAS2514.1. (full text)
Wu T, Yu R, Zhang F, Wang Z, Dong M, Wang L, Jin X, Chen D, LiL (2010) The Beijing Climate Center atmospheric general circulation model: description and its performance for the present-day climate. Clim.Dyn., 34:123–147. doi:10.1007/s00382-008-0487-2. (PDF; full text)
Yan H (1987) Design of a nested fine-mesh model over the complex topograph, Part two: parameterization of the subgrid physical processes. Plateau Meteorol, 6(suppl):64–139.
Zhang GJ, Mu M (2005) Effects of modifications to the Zhang-McFarlane convection parameterization on the simulation of the tropical precipitation in the National Center for Atmospheric Research Community Climate Model, version 3. J.Geophys.Res.,110:D09109. doi:10.1029/2004JD005617.
Guo Zhun, Wu Chunqiang, Zhou Tianjun et al. (2011) A comparison of cloud ratiative forcings simulated by LASG/IAP and BCC atmospheric General Circulation models. Chinese Journal of Atmospheric Sciences (in Chinese),35(4):739-752. (full text)
Chen Haoming, Rucong Yu, Jian Li, XiaogeXin, Zaizhi Wang, Tongwen Wu, 2011: The coherent interdecadal changes of East Asia climate in mid-summer simulated by BCC_AGCM 2.0.1, Clim.Dyn., DOI 10.1007/s00382-011-1154-6(published online first). (full text)
DONG Min, WU Tongwen, WANG Zaizhi, ZHANG Fang, 2010: Simulations of the tropical intraseasonal oscillation by the atmospheric general circulation model of the Beijing Climate Center, Acta Meteor. Sinica, 24(5), 1-23. (full text)
Jie Weihua, Wu Tongwen, 2010: Hindcast for the 1998 summer heavy precipitation in the Yangtze and Huaihe River Valley using BCC_AGCM2.0.1 model. Chinese Journal of Atmospheric Science (in Chinese), 34(5):962-978. (full text)
Dong Min, Wu Tongwen, Wangzaizhi, Zhang Fang.2009: Simulations of the tropical intraseasonal oscillations by the AGCM of the Beijing Climate Center, Acta Meteorologica Sinica (in Chinese), 67(6):912-922. (full text)
Wang Lu, Zhou Tianjun, Wu Tongwen, Wu Bo, 2009: Simulation of the leading mode of Asian-Australian monsoon interannual cariablility with the Beijing Climate Center atmospheric general circulation model. Acta Meteorologica Sinica (in Chinese), 67(6):973-982. (full text)