@ElectronicSource{MendonçaBona:2009:ExEOPe,
             abstract = "The impact of modifications of the perturbation method based on 
                         empirical orthogonal functions (EOF method) used operationally 
                         upon the ensemble prediction system (EPS) at CPTEC/INPEis 
                         evaluated. The main changes proposed in this study are: to apply 
                         the EOF method to perturb the midlatitudes; apply additional 
                         perturbations to the surface pressure (P) and specific humidit (Q) 
                         fields; and, compute regional perturbations over South America. 
                         The impact of these modifications in the characteristics of the 
                         initial perturbations and in the quality of the EPS forecasts is 
                         investigated. The EPS forecasts are evaluated through average 
                         statistical scores over the period 15 December 2004 to 15 February 
                         2005. The statistical scores used in the evaluation are pattern 
                         anomaly correlation, root mean square error, ensemble spread, 
                         Brier skill score and pertubation versus error correlation 
                         analysis (PECA). Results indicate that will the inclusion of 
                         perturbations on P and Q, EOF-based perturbations acquire a more 
                         baroclinic structure. It is also observed that the simultaneous 
                         applications of additional perturbations both in the extratropics 
                         and to the P and Q fileds improves the performance of CPTEC-EPS 
                         and enhances the quality of forecasts perturbations. Moreover, 
                         regional EOF-based perturbations computed over South America have 
                         positive impact on the ensemble forecasts over the target 
                         region.",
              address = "S{\~a}o Jos{\'e} dos Campos",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE/CPTEC)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE/CPTEC)}",
               author = "Mendon{\c{c}}a, Antonio Marcos and Bonatti, Jos{\'e} Paulo",
             keywords = "*.",
             language = "en",
       lastupdatedate = "2008-08-26",
            publisher = "Instituto and Nacional and de and Pesquisas and Espaciais",
                  ibi = "6qtX3pFwXQZGivnK3Y/UQEuP",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZGivnK3Y/UQEuP",
           targetfile = "v1.pdf",
                title = "Experiments with EOF-Based perturbation methods and their Impact 
                         on the CPTEC/INPE Ensemble Prediction System",
         typeofmedium = "On-line",
                 year = "2009",
        urlaccessdate = "08 maio 2024"
}