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@InProceedings{MedeirosAravHerdSouz:2010:AsDaAs,
               author = "Medeiros, Maria das Dores Silva and Arav{\'e}quia, Jose 
                         Ant{\^o}nio and Herdies, Dirceu L. and Souza, Solange Silva de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Assessing the data assimilation system 4D-LETKF/AGCM-CPTEC using 
                         data from the BARCA/LBA field experiment",
            booktitle = "Posters",
                 year = "2010",
         organization = "The Meeting of the Americas.",
             keywords = "data assimilation.",
             abstract = "This study evaluates the performace of a new data assimilation 
                         system using the 4D-Local Ensemble Transform Kalman Filter 
                         (4D-LETKF) with the Atmospheric General Circulation Model (AGCM) 
                         of the Center for Weather Forecast and Climate Studies (CPTEC). 
                         This new data assimilation system has been assessed using data 
                         from the Balance Regional Atmospheric Carbon in the Amazon/Large 
                         Scale Biosphere-Atmosphere Experiment in Amazonia (BARCA/LBA) 
                         field experiment (June 2008). Only conventional surface and upper 
                         air data have been assimilated by 4D-LETKF. The results were 
                         compared with the operational data assimilation system, Global 
                         Physical-space Statistical Analysis System (GPSAS). Observational 
                         data collected during the BARCA/LBA field experiment over the 
                         Amazon region were used to verify the analysis and forecasts 
                         generated by the two assimilation systems. The analysis and 
                         forecasts 4D-LETKF/AGCM-CPTEC shows better results than GPSAS for 
                         some variables. The larger impacts were in the lower levels mainly 
                         in the zonal and meridional wind field. In the high and medium 
                         levels the analysis and forecasts 4D-LETKF/AGCM-CPTEC shows 
                         results similar to GPSAS. However, for the period studied, the 
                         temperature field was best represented by GPSAS. In general, 
                         results 4D-LETKF/AGCM-CPTEC verified from observational data of 
                         the the BARCA/LBA field experiments proved very satisfactory. The 
                         next stage of this work is the direct assimilation of radiances by 
                         4D-LETKF, which should help reduce the error analysis and 
                         reproduce results closer to observations.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "8-13 Aug. 2010",
             language = "en",
           targetfile = "Medeiros_assessing.pdf",
                 type = "On-line",
        urlaccessdate = "29 mar. 2024"
}


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