author = "Gan, Manoel Alonso and Lima, Jeane Rafaele Ara{\'u}jo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Interannual variability of South American monsoon circulation",
            booktitle = "Abstracts...",
                 year = "2016",
         organization = "European Geophysical Society General Assembly",
                 note = "Geophysical Research Abstract, v.18",
             abstract = "The South America Monsoon System (SAMS) is responsible for 
                         influencing the atmospheric circulation and precipitation over 
                         most of tropical South America (SA) during the summer season. 
                         Studies for aiming to understand the temporal variability of this 
                         system have great value to the scientific community, because the 
                         processes that control the monsoon climate are not totally clear. 
                         Thus, the main objective of this research is to investigate the 
                         possible large-scale climatic factors and the remote interaction 
                         mechanisms, which may be associated with summer season interannual 
                         variability focusing on identifying the main differences between 
                         dry and wet extremes rainy season in the South-eastern Amazon 
                         Basin (SAB), Central-West (WC) and Southeast (SE) of Brazil, which 
                         are areas influenced by the summer monsoon regime. For such 
                         analyzes, Pearson correlations, quantile method and composite 
                         analysis were used during the period from 1979 to 2014. The 
                         correlation between precipitation anomaly in SAB and the sea 
                         surface temperature anomaly (SSTA) and wind at 850hPa and 300hPa 
                         indicate El Niņo-Southern Oscillation (ENSO) influence. 
                         Precipitation anomalies in WC did not show significant correlation 
                         with SSTA. However, a pattern similar to ENSO Modoki type was 
                         observed in the composite analysis. At 850 hPa, the presence of an 
                         anomalous cyclonic (anticyclonic) circulation was observed over 
                         the central region of SA during wet (dry) summers seasons. Over SE 
                         region of Brazil, a dipole SSTA pattern over the South Atlantic 
                         was identi- fied, as well the presence of anomalous circulations 
                         with an equivalent barotropic structure over these SSTA areas. 
                         This pattern is more evident in case of dry summer on the SE. At 
                         300 hPa, the wave train between 30\◦S-60\◦S was 
                         observed presenting a feature curvature from 120\◦W 
                         reaching SA, similar to the Pacific-South American pattern (PSA). 
                         Analysis of the summer interannual variability indicated the 
                         manifestation of wet summers more frequently than dry summers in 
                         the SAB during the last decade. On the other hand the SE region 
                         experienced rainfall deficit during the last five summer seasons, 
                         with the summer of 2013/2014 considered the driest over the last 
                         35 summers studied in this region.",
  conference-location = "Vienna, Austria",
      conference-year = "17-22 Apr.",
             language = "en",
           targetfile = "gan_interannual.pdf",
        urlaccessdate = "23 nov. 2020"