@InProceedings{CavalcantiCast:2003:SoHeAt,
               author = "Cavalcanti, Iracema Fonseca Albuquerque and Castro, Christopher 
                         Alexander Cunninghan",
          affiliation = "Iracema F. A. Cavalcanti, Centro de Previsao de Tempo e Estudos 
                         Climaticos and Christopher C. Castro, Centro de Previsao de Tempo 
                         e Estudos Climaticos",
                title = "Southern hemisphere atmospheric loww frequency variability in a 
                         climate AGCM simulation",
            booktitle = "Proceedings...",
                 year = "2003",
                pages = "204--205",
         organization = "International Conference on Southern Hemisphere Meteorology and 
                         Oceanography, 7.",
            publisher = "American Meteorological Society",
             keywords = "Meteorologia.",
             abstract = "Observed atmospheric patterns of low frequency variability have 
                         been identified in the Southern Hemisphere, as the Pacific South 
                         America, wavenumber three, blocking and persistent anomalies. As 
                         these structures have influence over the continents of the SH, it 
                         is important to know if GCMs can represent low frequency 
                         variability patterns and how are these influences. Previous 
                         analysis using results of a climate AGCM simulation indicated the 
                         ability of the CPTEC/COLA AGCM to represent the PSA pattern in the 
                         SH winter season and high frequency wavetrains over middle 
                         latitudes of the SH and over South America. In the present study, 
                         a climate simulation using a higher resolution AGCM than that used 
                         before, is analysed to study atmospheric low frequency variability 
                         in the Southern Hemisphere, in the summer. Daily results of nine 
                         integrations with the AGCM CPTEC/COLA are analysed in the period 
                         of 1982/1983 to 1990/1991. OLR, meridional wind component and 
                         streamfunction are filtered to select the frequency between 30 and 
                         90 days. Correlation and EOF analyses, considering several 
                         regions, as well as analyses of convective areas over South 
                         America and Indonesia are performed to compare with observations. 
                         When the South America area is considered, the model results show 
                         two opposite centers of OLR over the continent, similar to the 
                         seasaw pattern found in observations. These are related to the 
                         South Atlantic Convergence Zone convection and its influence on 
                         areas to the south. When the meridional wind is analysed 
                         considering the Pacific and South America areas, a pattern of 
                         alternating centers is seen over South America and, over the 
                         Pacific Ocean, the PSA pattern depicting the tropics/extratropics 
                         teleconnection mode is well represented. Other areas, as Australia 
                         and Indian Ocean are also analysed and an opposite relation 
                         between Australia and New Zealand area is found. Considering South 
                         America, South Atlantic and austral Africa areas, two centers of 
                         opposite sign over the brazilian coast are the dominant pattern. 
                         Larger anomaly alternating centers are also seen over middle 
                         latitudes from the western South Atlantic to the Indian Ocean, and 
                         directed to the South Indian Convergence Zone, over southeastern 
                         Africa. When the whole SH is considered, the wavetrain over the 
                         Pacific and South America is still the dominant pattern. An 
                         intraseasonal oscillation is noticed over Indonesia area and also 
                         over tropical South America in the OLR filtered model data. The 
                         behaviour of convective activity over Indonesia and its influence 
                         on teleconnection patterns will also be discussed.",
  conference-location = "Wellington, New Zealand",
      conference-year = "24-28 Mar",
           copyholder = "SID/SCD",
             language = "en",
                  ibi = "x6e6X3pFwXQZ3DUS8rS5/yajH2",
                  url = "http://urlib.net/ibi/x6e6X3pFwXQZ3DUS8rS5/yajH2",
           targetfile = "2003_cavalcanti3.pdf",
                 type = "PRE",
                  url = "http://ams.confex.com/ams/pdfview.cgi?username=59610",
        urlaccessdate = "19 abr. 2024"
}