@Article{CavalcantiKaya:1999:HiPaAt,
               author = "Cavalcanti, Iracema Fonseca Albuquerque and Kayano, Mary Toshie",
                title = "High-frequency patterns of the atmospheric circulation over the 
                         Southern Hemisphere and South America",
              journal = "Meteorology and Atmospheric Physics",
                 year = "1999",
               volume = "69",
               number = "3-4",
                pages = "179--193",
             keywords = "meteorologia, hemisf{\'e}rio sul, eddy statistics, vortices.",
             abstract = "Daily 500-hPa geopotential height and 250-hPa meridional wind 
                         reanalyzed data obtained from the National Centers for 
                         Environmental Prediction are used to document austral winter (May 
                         to September) and summer (November to March) high-frequency 
                         variability in the Southern Hemisphere (SH) midlatitudes for the 
                         1990-1994 period. Empirical orthogonal function (EOF) technique is 
                         used to determine the high-frequency patterns for these variables 
                         in selected areas. The high-frequency anomalous 500-hPa 
                         geopotential height patterns for two areas in the SH midlatitudes 
                         (the zonally global domain and the western hemisphere) and the 
                         high-frequency anomalous 250-hPa meridional wind patterns in the 
                         western hemisphere between 15 degrees N and 70 degrees S are 
                         discussed. The high-frequency winter and summer patterns for both 
                         variables feature a wavetrain structure in the SH midlatitudes 
                         which is related to synoptic-scale systems, such as cyclones and 
                         anticyclones associated with frontal zones. The dominant 
                         high-frequency patterns in the SH midlatitudes manifest in the 
                         eastern hemisphere while the secondary ones appear in the 
                         southeastern Pacific. Analysis of the western hemisphere data 
                         reveal that the wavetrain in the South American sector extends 
                         northeastward over the continent, thus affecting the regional 
                         weather conditions. An important result presented here concerns 
                         the preference of the intense synoptic systems in the eastern 
                         hemisphere and in the southeastern Pacific to occur in a 
                         sequential instead of an intermittent fashion. This result might 
                         have a potential for being used in weather monitoring.",
                 issn = "0177-7971",
                label = "10141",
           targetfile = "10.1007_BF01030420.pdf",
        urlaccessdate = "02 maio 2024"
}