@InProceedings{SilveiraPezz:2010:MoSt,
               author = "da Silveira, Isabel Porto and Pezzi, Luciano Ponzi",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "SST anomalies in Southwestern Atlantic Ocean: a modelling study",
            booktitle = "Abstracts...",
                 year = "2010",
         organization = "The Meeting of the Americas.",
             keywords = "Ocean, atmosphere interactions.",
             abstract = "An ocean geral circulation model has been used to understand 
                         dynamical mechanisms of sea surface temperatures (SST) anomalies 
                         over Brazil Malvinas Confluence, in Southwestern Atlantic Ocean. 
                         It was verified two cases of anomalous conditions, one warm and 
                         other cold. In both cases, the surface wind was one of the forcing 
                         conditions to generate horizontal and vertical advection of water 
                         masses along the shore, causing such events. The warm year 
                         presented a climatology characterized for the intrusion of the 
                         Tropical Water reaching higher latitudes, for an eastward 
                         transport sufficiently intense and for upwelling. The results of 
                         this simulation showed two subduction points. The first one was in 
                         the inner platform and the other one, occupying the region of 50oW 
                         towards offshore. The upwelling process follows occurring next to 
                         the slope, from the 500 meters until the 60 meters depth, however 
                         not reaching the surface. This occured because the formation of an 
                         anomalous northward flow in the first 60 meters depth, forced by 
                         surface the winds. It has blocked the upwelling process near the 
                         break shore so the cold waters of Intermediate Antarctic Waters 
                         couldn't reach superficial layers. This process, together with the 
                         southward flow intensification of Brazil Current, stimulated the 
                         appearance of warm anomalous water. It seems that the warm 
                         anomalus water has been better represented for the model, 
                         therefore they were particularly tied with atmospheric processes. 
                         For the cold year case, the local forcing had also answered the 
                         atmospheric forcings as the surface wind and the pressure 
                         gradient. Which acted on the divergence generation at surface and 
                         consequently anomalously cold water outcrop. In the water column, 
                         a northward flow propagated through the inner platform, 
                         transporting anomalously cold waters, in surface, on the coast, 
                         water piling up occured. The water column was subdivided by the 
                         differences in the zonal speeds. In surface, negative speeds 
                         pushed water to the coast. The non movement level was equivalent 
                         to the 500 meters depth, where it occured divergence and 
                         intermediate waters were impulsioned for surface. Below of this 
                         depth, it was an offshore flow. A remote forcing could be tied 
                         with Drake Strait's oceanic, and perhaps, atmospheric 
                         circulations. From Drake Strait through Argentina platform has 
                         been presented an anomalous northward flow, of great thickness, 
                         spreading below 500 meters. This would be related to the 
                         variations in the Western Winds position and to the Antarctic 
                         Circumpolar Current (ACC) retroflexion. An increase in the ACC 
                         transport during it's retroflexion would increased the cold water 
                         advection. That in turn, would arrived to surface through 
                         upwelling processes over the region of the Subtropical Front.",
  conference-location = "Foz do Igua{\c{c}}u, BR",
      conference-year = "08-12 aug 2010",
             language = "en",
        urlaccessdate = "20 maio 2024"
}