@Article{NobreMelo:2001:VaClIn,
               author = "Nobre, Paulo and Melo, Anna Barbara Coutinho de",
          affiliation = "{Centro de Previsao de Tempo e Estudos Climaticos - CPTEC/INPE}",
                title = "Variabilidade climatica intrasazonal sobre o Nordeste do Brasil em 
                         1998-2000",
              journal = "Climan{\'a}lise - Boletim de Monitoramento e An{\'a}lise 
                         Clim{\'a}tica",
                 year = "2001",
               volume = "16",
               number = "12",
                pages = "1--15",
                month = "dec.",
             keywords = "meteorology, climate.",
             abstract = "Daily rainfall, wind, and omega datasets over the global tropics 
                         are analysed to characterize raifall intraseasonal variability 
                         over the Nordeste of Brazil. This work presents observational 
                         evidence that the temporal distribution of rainfall over Nordeste 
                         during the wet periods of 1998 to 2000 were modulated by planetary 
                         scale atmospheric oscillations detected along the tropics over 
                         both the Pacific and Atlantic Basins. Eastward propagating pulses 
                         of tropical convection reached the tropical Atlantic Ocean with 
                         periods ranging from 30 to 60 days. The negative phases of such 
                         pulses (associated with subsidence and suppression of rainfall) 
                         reached the Nordeste during the peak of the rainy season over the 
                         area, contributing to reducing the total seasonal rainfall totals 
                         substantially. The analyses also show that the pulses have a 
                         essentially baroclinic vertical structure, with 
                         convergence/divergence in lower levels aligned with 
                         divergence/convergence in upper levels of the troposphere, thus 
                         strongly modulating deep cummulus convection over the Nordeste. It 
                         is also shown that while the intraseasonal variability can be 
                         detected during all the three years analysed, its effect is 
                         largest in the absence of large scale induced subsidence over the 
                         region, as that associated with the 1998 ENSO event.",
           copyholder = "SID/SCD",
                 issn = "0103-0019",
             language = "pt",
           targetfile = "Nobre_Variabilidade climatica.pdf",
        urlaccessdate = "21 maio 2024"
}