Articles | Volume 14, issue 8
Geosci. Model Dev., 14, 5183–5204, 2021
https://doi.org/10.5194/gmd-14-5183-2021
Geosci. Model Dev., 14, 5183–5204, 2021
https://doi.org/10.5194/gmd-14-5183-2021

Development and technical paper 18 Aug 2021

Development and technical paper | 18 Aug 2021

Mitigation of the double ITCZ syndrome in BCC-CSM2-MR through improving parameterizations of boundary-layer turbulence and shallow convection

Yixiong Lu et al.

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Cited articles

Adam, O., Schneider, T., Brient, F., and Bischoff, T.: Relation of the double-ITCZ bias to the atmospheric energy budget in climate models, Geophys. Res. Lett., 43, 7670–7677, https://doi.org/10.1002/2016GL069465, 2016. 
Adam, O., Schneider, T., and Brient, F.: Regional and seasonal variations of the double-ITCZ bias in CMIP5 models, Clim. Dynam., 51, 101–117, https://doi.org/10.1007/s00382-017-3909-1, 2018. 
Adler, R. F., Huffman, G. J., Chang, A., Ferraro, R., Xie, P., Janowiak, J., Rudolf, B., Schneider, U., Curtis, S., Bolvin, D., Gruber, A., Susskind, J., and Arkin, P.: The version 2 Global Precipitation Climatology Project (GPCP) monthly precipitation analysis (1979–present), J. Hydrometeor., 4, 1147–1167, 2003. 
Back, L. E. and Bretherton, C. S.: On the relationship between SST gradients, boundary layer winds, and convergence over the tropical oceans, J. Climate, 22, 4182–4196, https://doi.org/10.1175/2009JCLI2392.1, 2009a. 
Back, L. E. and Bretherton, C. S.: A simple model of climatological rainfall and vertical motion patterns over the tropical oceans, J. Climate, 22, 6477–6497, https://doi.org/10.1175/2009JCLI2393.1, 2009b. 
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Short summary
The spurious precipitation in the tropical southeastern Pacific and southern Atlantic is one of the most prominent systematic biases in coupled atmosphere–ocean general circulation models. This study significantly promotes the marine stratus simulation and largely alleviates the excessive precipitation biases through improving parameterizations of boundary-layer turbulence and shallow convection, providing an effective solution to the long-standing bias in the tropical precipitation simulation.