Abstract
This paper presents an evaluation of climate simulations produced by the Brazilian Global Atmospheric Model version 1.2 (BAM-1.2) of the Center for Weather Forecast and Climate Studies (CPTEC). The model was run over the 1975–2017 period at two spatial resolutions, corresponding to ~ 180 and ~ 100 km, both with 42 vertical levels, following most of the Atmospheric Model Intercomparison Project (AMIP) protocol. In this protocol, observed sea surface temperatures (SSTs) are used as boundary conditions for the atmospheric model. Four ensemble members were run for each of the two resolutions. A series of diagnostics was computed for assessing the model’s ability to represent the top of the atmosphere (TOA) radiation, atmospheric temperature, circulation and precipitation climatological features. The representation of precipitation interannual variability, El Niño-Southern Oscillation (ENSO) precipitation teleconnections, the Madden and Julian Oscillation (MJO) and daily precipitation characteristics was also assessed. The model at both resolutions reproduced many observed temperature, atmospheric circulation and precipitation climatological features, despite several identified biases. The model atmosphere was found to be more transparent than the observations, leading to misrepresentation of cloud-radiation interactions. The net cloud radiative forcing, which produces a cooling effect on the global mean climate at the TOA, was well represented by the model. This was found to be due to the compensation between both weaker longwave cloud radiative forcing (LWCRF) and shortwave cloud radiative forcing (SWCRF) in the model compared to the observations. The model capability to represent inter-annual precipitation variability at both resolutions was found to be linked to the adequate representation of ENSO teleconnections. However, the model produced weaker than observed convective activity associated with the MJO. Light daily precipitation over the southeast of South America and other climatologically similar regions was diagnosed to be overestimated, and heavy daily precipitation underestimated by the model. Increasing spatial resolution helped to slightly reduce some of the diagnosed biases. The performed evaluation identified model aspects that need to be improved. These include the representation of polar continental surface and sea ice albedo, stratospheric ozone, low marine clouds, and daily precipitation features, which were found to be larger and last longer than the observed features.
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Acknowledgements
We thank two anonymous reviewers for providing valuable comments and suggestions that contributed to improving the quality of this manuscript. We thank Bárbara Yamada for the technical support in obtaining part of the observational datasets used in this study. This research was partially supported by the Climate Science for Services Partnership Brazil project (CSSP-Brazil) funded by the Newton Fund. CASC thanks Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), process 305206/2019-2, and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), process 2015/50687-8 (CLIMAX Project) for the support received. DCS was supported by CNPq (process 167804/2018-9). BSG was supported by CNPq and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). NPK was supported by an Independent Research Fellowship from the UK Natural Environment Research Council (NE/L010976/1) and by the National Centre for Atmospheric Science ACREW project.
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Coelho, C.A.S., de Souza, D.C., Kubota, P.Y. et al. Evaluation of climate simulations produced with the Brazilian global atmospheric model version 1.2. Clim Dyn 56, 873–898 (2021). https://doi.org/10.1007/s00382-020-05508-8
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DOI: https://doi.org/10.1007/s00382-020-05508-8