@InProceedings{HerdiesSilv:2004:DaAsIm,
               author = "Herdies, Dirceu Luis and Silva Dias, Pedro Leite",
          affiliation = "{CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil}",
                title = "Data assimilation impact on the moisture transport from the Amazon 
                         to the Plata basin",
            booktitle = "Anais...",
                 year = "2004",
         organization = "Conferencia Cientifica do LBA, 3.",
             keywords = "low level jet - LLJ, data assimilation.",
             abstract = "The assimilation system at CPTEC is performed using the 
                         Physical-space Statistical Analysis System (PSAS), both in the 
                         Atmospheric Global Circulation Model and the Regional Model. This 
                         scheme solves analysis equations globally, thus eliminating the 
                         local approximation and data selection of the optimal 
                         interpolation (OI) schemes. PSAS is comparable to the global 
                         variational spectral analysis system, but unlike spectral analysis 
                         schemes, it works directly in physical space. It minimizes an 
                         objective function with the control variable defined in 
                         observation space. During the SALLJEX (South American Low-level 
                         Jet Experiment) experiment, six radiosonde data were added to the 
                         normal dataset which comprises the GTS, ATOVS, TPW and QuikScat 
                         data. These radiosondes were operating in an area which was not 
                         covered by the operational measurements, the area of the Low Level 
                         Jet occurrence. Thus, a better description of the moisture flux 
                         from the Amazon to the south is expected to be accomplished. The 
                         objective is to show the impact of assimilating these additional 
                         data in the analysis system during the SALLJEX, and to show the 
                         impact on the magnitude of the moisture flow, using the CPTEC 
                         Global model. The results show that there is an intensification of 
                         the LLJ and a small shifting of its center towards west and an 
                         increase of the humidity in the area of the LLJ.",
  conference-location = "Brasilia",
      conference-year = "27-29 jul.",
             language = "en",
         organisation = "LBA",
           targetfile = "Herdies_LBA.pdf",
        urlaccessdate = "25 abr. 2024"
}