| Texto completo | |
| Autor(es): Mostrar menos - |
Coelho, Caio A. S.
[1]
;
de Souza, Dayana C.
[1]
;
Kubota, Paulo Y.
[1]
;
Costa, Simone M. S.
[1]
;
Menezes, Layrson
[1]
;
Guimaraes, Bruno S.
[1]
;
Figueroa, Silvio N.
[1]
;
Bonatti, Jose P.
[1]
;
Cavalcanti, Iracema F. A.
[1]
;
Sampaio, Gilvan
[1]
;
Klingaman, Nicholas P.
[2, 3]
;
Baker, Jessica C. A.
[4]
Número total de Autores: 12
|
| Afiliação do(s) autor(es): | [1] Inst Nacl Pesquisas Espaciais INPE, Ctr Previsao Tempo & Estudos Climaticos CPTEC, Rodovia Presidente Dutra, Km 40, BR-12630000 Cachoeira Paulista, SP - Brazil
[2] Univ Reading, Natl Ctr Atmospher Sci Climate, POB 243, Reading RG6 6BB, Berks - England
[3] Univ Reading, Dept Meteorol, POB 243, Reading RG6 6BB, Berks - England
[4] Univ Leeds, Inst Climate & Atmospher Sci, Sch Earth & Environm, Leeds, W Yorkshire - England
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Climate Dynamics; v. 56, n. 3-4, p. 873-898, FEB 2021. |
| Citações Web of Science: | 1 |
| Resumo | |
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 similar to 180 and similar to 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 Nino-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. (AU) | |
| Processo FAPESP: | 15/50687-8 - Serviços climáticos através de co-produção de conhecimento: uma iniciativa europeia e da América do Sul para fortalecer as ações de adaptação da sociedade a eventos extremos |
| Beneficiário: | Iracema Fonseca de Albuquerque Cavalcanti |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |