@Article{MoraisGanYosh:2021:FeUpTr,
               author = "Morais, Michelyne Duarte Coutinho de and Gan, Manoel Alonso and 
                         Yoshida, Marcos Cezar",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Features of the upper tropospheric cyclonic vortices of Northeast 
                         Brazil in life cycle stages",
              journal = "International Journal of Climatology",
                 year = "2021",
               volume = "41",
               number = "Supl. 1",
                pages = "E39--E58",
                month = "Jan.",
             keywords = "features, life cycle stages, Northeast Brazil, upper tropospheric 
                         cyclonic vortices.",
             abstract = "The main purpose of the study is to explore in more detail the 
                         Upper Tropospheric Cyclonic Vortices (UTCVs) features over 
                         Northeast Brazil (NEB) in an attempt to improve weather forecasts. 
                         The various aspects of the life cycle features of the UTCVs over 
                         NEB are presented here, because these aspects have not been 
                         investigated in previous studies. Initially, the UTCVs were 
                         identified at 200 hPa, and then, they were identified at lower 
                         levels to analyse their vertical structure, using 6-hr data for a 
                         30-year period (1984-2013) from the European Center for Medium 
                         Range Weather Forecasts' reanalysis (ERA Interim). An objective 
                         method was improved to obtain at first-hand the trajectory and the 
                         vertical extent of the UTCVs over NEB. Some statistics results 
                         were consistent with previous studies related to relative 
                         frequency, duration and direction of movement. However, further 
                         results were obtained too. An average distance of 2,000 km for the 
                         UTCVs total travel was found. Of this average distance, 750 km was 
                         reached by UTCVs on the first day of the life cycle, leading to 
                         the presumption of a possible suppression of vortex movement that 
                         depends on a diabatic mechanism. We also found predominance of 
                         UTCVs without vertical tilt or with east tilt with increasing 
                         height. When considering life cycle stages (formation, maximum 
                         depth and dissipation), diversity was observed in intensity with 
                         stages, levels and seasons of the year, with spring exhibiting the 
                         most intense UTCVs over all seasons. Finally, our finding about 
                         interannual variability is novel. There was a tendency for the 
                         average number of UTCVs to be slightly higher during El Nino 
                         summers compared with La Nina summers.",
                  doi = "10.1002/joc.6839",
                  url = "http://dx.doi.org/10.1002/joc.6839",
                 issn = "0899-8418",
             language = "en",
           targetfile = "moraes_features.pdf",
        urlaccessdate = "09 maio 2024"
}