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@InProceedings{LatinovicChouNobr:2013:CaMoGl,
               author = "Latinovic, Dragan and Chou, Sin Chan and Nobre, Paulo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Capacidade do modelo Global Eta Framework (GEF) para prever 
                         eventos clim{\'a}ticos extremos/ Capability of Global Eta 
                         Framework(GEF) to predict extreme climate events",
            booktitle = "Anais...",
                 year = "2013",
         organization = "Simp{\'o}sio Internacional de Climatologia, 5. (SIC).",
             keywords = "GEF, quasi-uniform, climate.",
             abstract = "RESUMO: Global Eta Framework (GEF) {\'e} um modelo 
                         atmosf{\'e}rico global baseado em grades quase-uniformes. Grades 
                         esf{\'e}ricas quase-uniformes representam uma alternativa 
                         atraente para o padr{\~a}o de grades esf{\'e}ricas de lat-lon 
                         para aplica{\c{c}}{\~a}o em modelos globais para a atmosfera e o 
                         oceano. Gra{\c{c}}as aos pontos de grade quase igualmente 
                         distribu{\'{\i}}dos que essas grades tem, n{\~a}o existe a 
                         incoer{\^e}ncia da resolu{\c{c}}{\~a}o na {\'a}rea em torno 
                         dos p{\'o}los em compara{\c{c}}{\~a}o com a {\'a}rea em torno 
                         do equador, assim como n{\~a}o existem singularidades nos 
                         p{\'o}los, que {\'e} t{\'{\i}}pico para qualquer grade baseada 
                         em padr{\~a}o de lat-lon. Efici{\^e}ncia excepcional 
                         computacional deste modelo prop{\~o}e-o como uma das ferramentas 
                         mais {\'u}teis para pesquisas clim{\'a}ticas. Nesta pesquisa, o 
                         modelo foi rodado para o per{\'{\i}}odo de 2 anos, pela primeira 
                         vez, e havia duas rodadas realizadas, for{\c{c}}adas pelos dados 
                         de TSM obtidos a partir de rean{\'a}lise NCEP, com 
                         condi{\c{c}}{\~o}es iniciais de fevereiro de 1996 e fevereiro de 
                         1998. Estes anos para as condi{\c{c}}{\~o}es iniciais foram 
                         escolhidos a fim de avaliar a capacidade do modelo para simular as 
                         condi{\c{c}}{\~o}es de um dos eventos mais extremos do ENOS, com 
                         sua fase quente-El Niņo, em 1997 e fase frio-La Niņa em 1999. Para 
                         testar as leis de conserva{\c{c}}{\~a}o do modelo, os campos da 
                         press{\~a}o de superf{\'{\i}}cie e precipita{\c{c}}{\~a}o 
                         acumulada foram analisados. Para o padr{\~a}o de grande escala, 
                         os resultados do modelo dos campos de temperatura em 850mb, 
                         velocidade do vento em 200mb e 850mb e precipita{\c{c}}{\~a}o 
                         acumulada foram comparados com os dados de rean{\'a}lise 
                         apropriados do projeto Era Interim e dados observados de GPCP. 
                         Al{\'e}m disso, as correla{\c{c}}{\~o}es espaciais foram 
                         calculadas e analisadas. Todos os testes foram feitos com os 
                         valores m{\'e}dios de tr{\^e}s meses de inverno e ver{\~a}o. No 
                         final, a diferen{\c{c}}a do ano de El Niņo e o ano de La Niņa, de 
                         todos os campos mencionados, e para ambas as esta{\c{c}}{\~o}es 
                         foi calculada, plotada e comparada com as observa{\c{c}}{\~o}es 
                         e rean{\'a}lises apropriados, a fim de verificar a capacidade do 
                         modelo para prever esta anomalia. O principal motivo para esta 
                         pesquisa foi uma an{\'a}lise mais profunda das melhoras recentes 
                         realizadas no modelo GEF, com base na tentativa de estender a 
                         rodada do modelo at{\'e} escalas clim{\'a}ticas. Todos os testes 
                         realizados e os resultados obtidos levam-nos a concluir que o GEF 
                         {\'e} definitivamente capaz de rodar em escalas clim{\'a}ticas, 
                         bem como de captar o sinal de evento clim{\'a}tico extremo, como 
                         {\'e} um fen{\^o}meno ENOS. ABSTRACT: Global Eta Framework(GEF) 
                         is a global atmospheric model based on quasi-uniform grids. 
                         Quasi-uniform spherical grids represent an attractive alternative 
                         to the standard lat-lon spherical grids for application in global 
                         models for the atmosphere and ocean. Thanks to nearly equally 
                         distributed grid points which these grids have, inconsistency of 
                         the resolution in the area around the poles compared with the area 
                         around the equator is avoided, as well as existence of 
                         singularities on the poles, which is typical for any lat-lon based 
                         grid. Exceptional computing efficiency of this model proposed it 
                         as one of the most useful tools in climate researches. In this 
                         research, the model was run for the period of 2 years, for the 
                         first time, and there were two runs performed, forced by the SST 
                         data obtained from NCEP reanalysis, with initial conditions from 
                         February 1996 and February 1998. These years for initial 
                         conditions were chosen in order to assess the capability of the 
                         model to simulate the conditions of one of the most extreme ENSO 
                         events, with its warm, El Niņo phase from 1997 and cold, La Niņa 
                         phase from 1999. To test conservation laws of the model, surface 
                         pressure and accumulated precipitation fields were analyzed. For 
                         the large scale pattern, the model outputs of the fields of 
                         temperature at 850mb, wind speed at 200mb and 850mb and 
                         accumulated precipitation were compared with the appropriate 
                         reanalysis data from Era Interim project and observed data from 
                         GPCP. In addition, the spatial correlations were calculated and 
                         analyzed. All of the tests were done using three months average 
                         values for the winter and summer season. At the end, the 
                         difference of the year with El Niņo and the year with La Niņa for 
                         all the mentioned fields, and for both seasons was calculated, 
                         plotted and compared with appropriate reanalysis and observations 
                         in order to check the capability of the model to predict that 
                         anomaly. The main motivation for this research was further 
                         analysis of the recent improvements made on GEF, based on the 
                         attempt to extend the model run up to the climate scales. All the 
                         tests performed and results obtained lead us to conclusion that 
                         GEF is definitely capable of running on climate scales as well as 
                         of capturing the signal of extreme climate event such is ENSO 
                         phenomenon.",
  conference-location = "Florian{\'o}polis, SC",
      conference-year = "15-19, set.",
        urlaccessdate = "23 jan. 2021"
}


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