@InProceedings{RoquedaSilvaFranRibe:2006:ClVaOv,
               author = "Roque da Silva, Felipe das Neves and Fran{\c{c}}a, Jos{\'e} 
                         Ricardo de Almeida and Ribeiro, Laura Alice de Ara{\'u}jo",
          affiliation = "Centro Federal de Educa{\c{c}}{\~a}o Tecnol{\'o}gica Celso 
                         Suckow da Fonseca (CEFET-RJ), Coordenadoria de Meteorologia and 
                         Avenida Maracn{\~a} 229, Bloco A, 4º andar, Maracan{\~a}. 
                         20271-110 Rio de Janeiro, RJ, Brazil (Roque da Silva) and 
                         Universidade Federal do Rio de Janeiro (UFRJ), Centro de 
                         Ci{\^e}ncias Matem{\'e}ticas e da Natureza, Instituto de 
                         Geoci{\^e}ncias, Departamento de Meteorologia and Avenida 
                         Brigadeiro Trompowski, s/n, Bloco G, Ilha do Fund{\~a}o. 
                         21941-590 Rio de Janeiro, RJ, Brazil (Fran{\c{c}}a and Ribeiro)",
                title = "Climate variability over South America and South Atlantic 
                         associated to sea surface temperature (SST) anomalies in tropical 
                         Pacific and subtropical South Atlantic Oceans",
            booktitle = "Proceedings...",
                 year = "2006",
               editor = "Vera, Carolina and Nobre, Carlos",
                pages = "1355--1358",
         organization = "International Conference on Southern Hemisphere Meteorology and 
                         Oceanography, 8. (ICSHMO).",
            publisher = "American Meteorological Society (AMS)",
              address = "45 Beacon Hill Road, Boston, MA, USA",
             keywords = "El-Niño, La-Niña, Southern oscillation, climate variability, South 
                         Atlantic Convergence Zone (SACZ).",
             abstract = "The objective of this work is to use the Laboratoire de 
                         M{\'e}t{\'e}orologie Dynamique (LMD - France) Atmosphere General 
                         Circulation Model to investigate the relationship between SST 
                         anomalies in Pacific and Atlantic Oceans (in the confluence region 
                         of Brazil and Falklands currents) and the climate variability over 
                         South America and South Atlantic. Particularly this work has 
                         intended to study how the climate in these regions behaves when 
                         the position of Brazil and Falklands currents was modified, along 
                         with El Niño, La Niña and neutrality situations in the tropical 
                         Pacific. Initially it was made a simulation using climatological 
                         SSTs (control simulation). Next, idealized scenarios (forced) have 
                         been created for simulating the presence of El Niño/La Niña and/or 
                         positive/negative SST anomalies in the confluence region of Brazil 
                         and Falklands currents (in the other regions SST remains 
                         climatological). In fact, in the confluence region, it was used 
                         positive SST anomalies to simulate the Brazil current more to the 
                         South and negative ones in case of the Falklands currents more to 
                         the North. All the simulations (control and forced) have had the 
                         same initial conditions. This way, nine simulations have been 
                         generated. All of them had been run from October to February using 
                         ensemble forecasting technique with ten members each. Results had 
                         been generated for December/January/February summer trimester. 
                         Initial data correspond to the first ten days of October 1997 
                         proceeding from NCEP (National Centers for Environmental 
                         Prediction) reanalysis at 00 UTC. Sea surface temperature (SST) 
                         data are from optimum interpolation (OI) analysis. This data 
                         correspond the monthly means between 1971 and 2000 and they had 
                         been interpolated to daily values to force the model. Both initial 
                         and boundary data had been interpolated to the model grid. Results 
                         show that the greatest effect of SST anomalies in the confluence 
                         region occur in the SACZ region. Positive SST anomalies tend to 
                         diminish precipitation in the SACZ region, while negative SST 
                         anomalies cause an increase in this region. These alterations are 
                         linked to changes in pressure patterns in this region. In relation 
                         to the joint effect of El Niño and positive/negative SST anomalies 
                         in the Atlantic, increase of precipitation in the SACZ region was 
                         evidenced in both cases. Similar results had been found for La 
                         Niña and positive/negative SST anomalies in the Atlantic.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "24-28 Apr. 2006",
             language = "en",
         organisation = "American Meteorological Society (AMS)",
                  ibi = "cptec.inpe.br/adm_conf/2005/10.13.17.55",
                  url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.13.17.55",
           targetfile = "557-562.pdf",
                 type = "Role of the SH oceans in climate",
        urlaccessdate = "27 abr. 2024"
}