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@InProceedings{EidtCava:2018:RaVaOv,
               author = "Eidt, Renata Tatsch and Cavalcanti, Iracema Fonseca de 
                         Albuquerque",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Rainfall variability over South America associated with SST 
                         anomalies in South Pacific and South Atlantic oceans",
                 year = "2018",
         organization = "International Conference for Southern Hemisphere Meteorology and 
                         Oceanography, 12. (AMOS-ICSHMO)",
             abstract = "Sea surface temperature (SST) anomalies influence atmospheric 
                         circulation and contribute to changes in weather and climate 
                         around the globe. It is already known that precipitation over 
                         continental areas can be associated with SST variability in the 
                         tropics. However, the importance of extratropical oceans is still 
                         not completely understood. The aim of this study is to investigate 
                         the influence of extratropical SST anomalies to rainfall 
                         variability, focusing on South America, and the oceanic and 
                         atmospheric processes involved. The period from 1981 to 2010 was 
                         studied in a monthly scale, using SST and precipitation data 
                         obtained from NOAA datasets (ERSST-v5 and GPCP, respectively), and 
                         atmospheric data from CFSR reanalysis. Singular Value 
                         Decomposition (SVD) showed connectivity between SST variations in 
                         extratropical oceans and rainfall variability over southeastern 
                         South America, an important agricultural area. Extreme wet and dry 
                         events over this region were identified using the Standardized 
                         Precipitation Index (SPI), to a further evaluation of the oceanic 
                         conditions associated with these episodes. Empirical Orthogonal 
                         Functions (EOF) and SVD were applied for the identification of 
                         principal modes of variability. Dipoles of SST were identified in 
                         South Pacific and South Atlantic oceans. Two areas of opposite 
                         signs were observed in western (~25S) and southern (~55S) South 
                         Pacific Ocean, regions of atmospheric blocking and the South 
                         Pacific Convergence Zone (SPCZ). Positive SST anomalies in the 
                         southern area are related to precipitation increase over 
                         southeastern South America. The southern oceanic area is also 
                         associated with a dipole of precipitation over Southeast Asia and 
                         central Pacific Ocean. A dipole signal was also noticed in western 
                         South Atlantic Ocean, mainly from September to December, varying 
                         in position and intensity near South America. The results obtained 
                         showed that extratropical oceans have an important role for 
                         precipitation variability in remote regions, and the oceanic areas 
                         identified can contribute to climate monitoring.",
  conference-location = "Sydney, Australias",
      conference-year = "05-09 feb.",
             language = "en",
        urlaccessdate = "21 jan. 2021"
}


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