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@InProceedings{AndreoliSoFeSaHeArMa:2006:FiReUs,
               author = "Andreoli, Rita Val{\'e}ria and Souza, Rodrigo Augusto Ferreira de 
                         and Ferreira, Sergio Henrique Soares and Sapucci, Luiz Fernando 
                         and Herdies, Dirceu Luis and Arav{\'e}quia, Jos{\'e} Antonio and 
                         Mattos, Jo{\~a}o Gerd Zell de",
          affiliation = "Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC) and 
                         Instituto Nacional de Pesquisas Espaciais (INPE), Centro de 
                         Previs{\~a}o de Tempo e Estudos Clim{\'a}ticos (CPTEC)",
                title = "First results from the use of the Aqua Sounding System in the 
                         CPTEC global data assimilation/forecast system",
            booktitle = "Proceedings...",
                 year = "2006",
         organization = "Proceedings of the Fifteenth International Tovs Study 
                         Conference.",
             keywords = "aqua sounding, global data assimilation, forecast system, 
                         numerical weather prediction model, hydrostatic relation, AQUA.",
             abstract = "The Center for Weather Forecasting and Climate Studies of the 
                         National Institute for Space Research (CPTEC/INPE) is responsible 
                         for producing weather forecast in Brazil. The key issue for 
                         numerical prediction is related to provide good estimation of the 
                         initial conditions for the Numerical Weather Prediction Model. 
                         Nowadays, remote sensing data have become the predominant source 
                         of information. The CPTEC operationally uses information from 
                         ATVOS/NOAA system to supply such vertical profiles and more 
                         recently has been implemented the AQUA sounding system (AIRS/ 
                         AMSU). Experiments using these data have been conducting to 
                         evaluate its impact on weather analysis and forecasting. In these 
                         experiments, AIRS/AMSU retrievals were assimilated in different 
                         forms using the Physical-space Statistical Analysis System (PSAS) 
                         data assimilation system. The spectral Atmospheric Global 
                         Circulation Model CPTEC/COLA was used to generate the first guess 
                         and state predict to 5 days. The PSAS analysis requires that 
                         temperature profiles observations need to be converted to 
                         geopotential height profiles, using the hydrostatic relation, and 
                         {"} anchoring{"} the profile with either the background surface 
                         pressure. In the present study two experiments was done. The first 
                         experiment considers the first guess height field for the 
                         anchoring of the height profile, therefore, the lowest height 
                         value, which would be exactly the first guess is not included in 
                         the observation vector. The second experiment considers that 
                         anchoring is independent of the first guess, and the height of 
                         surface is included in the observation vector. The results from 
                         the initial experiments with AQUA data indicate significant 
                         improvements in forecast skill over the Southern hemisphere and 
                         improvement over the Northern hemisphere, most notably for the 
                         second experiment, compared with the experiment without AIRS/AMSU 
                         data, indicating the potential of AQUA sounding system to improve 
                         operational forecast skill at CPTEC/INPE.",
  conference-location = "Maratea, Italy",
      conference-year = "Oct. 04-10",
           copyholder = "SID/SCD",
             language = "en",
         organisation = "International TOVS Study Conferences (ITSC)",
           targetfile = "Andreoli.First.pdf",
                  url = "http://cimss.ssec.wisc.edu/itwg/itsc/",
        urlaccessdate = "15 jan. 2021"
}


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