@InProceedings{LyraHGSSGQMCCVFP:2024:ExPrEv,
               author = "Lyra, Matheus Jos{\'e} Arruda and Herdies, Dirceu Luis and Gomes, 
                         Helber and Silva, Maria Cristina Lemos and Silva, Fabricio Daniel 
                         dos Santos and Gomes, Heliof{\'a}bio Barros and Quadro, 
                         M{\'a}rio Francisco Leal de and Mantovani J{\'u}nior, Jos{\'e} 
                         Ant{\^o}nio and Coelho, William Ferreira and Calvetti, Leonardo 
                         and Vendrasco, {\'E}der Paulo and Figueroa, Silvio Nilo and 
                         Pendharkar, Jayant",
          affiliation = "{Universidade Federal de Alagoas (UFAL)} and {Instituto Nacional 
                         de Pesquisas Espaciais (INPE)} and {Universidade Federal de 
                         Alagoas (UFAL)} and {Universidade Federal de Alagoas (UFAL)} and 
                         {Universidade Federal de Alagoas (UFAL)} and {Universidade Federal 
                         de Alagoas (UFAL)} and {} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Universidade Federal de Pelotas (UFPel)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Extreme Precipitation Events in Northeast Brazil Triggered by 
                         Different Synoptic Scale Systems",
            booktitle = "Proceedings...",
                 year = "2024",
         organization = "American Meteorologial Society Annual Meeting, 104.",
            publisher = "AMS",
             abstract = "This study aims to analyze the synoptic patterns responsible for 
                         the different systems development that led to extreme 
                         precipitation events in Brazilian Northeast (BNE) on three 
                         different dates - May 27, 2017, February 20, 2020, and March 14, 
                         2023. Despite having the driest region of Brazil (The Sert{\~a}o) 
                         with rainfall values not exceeding 400 mm per year, BNE is 
                         characterized by the influence of several synoptic-scale systems 
                         throughout the year that contribute to extreme precipitation 
                         events over the region. ERA5 global reanalysis data have been used 
                         for synoptic and vertical structure evaluation as a first step of 
                         analysis. MERGE precipitation product and pluviometric stations 
                         were used to document accumulated precipitation produced by these 
                         events. The following step will consist of conducting simulations 
                         at a very high-resolution using the Model for Prediction Across 
                         Scales (MPAS) to assess its ability to represent the circulation 
                         patterns associated with the extreme precipitation events 
                         analyzed. The three cases were situated in different sectors of 
                         BNE and were caused by different synoptic-scale systems: Easterly 
                         Wave Disturbances (EWD), Upper Tropospheric Cyclonic Vortex (UTCV) 
                         and Intertropical Convergence Zone (ITCZ), respectively. The first 
                         analyzed event was caused by an EWD, where the axis of a trough at 
                         the 850 hPa level was observed along with intense moisture 
                         transport along the eastern coast of BNE, resulting in an intense 
                         rainfall of 173 mm/24h. The second event, considered more 
                         atypical, was triggered by an UTCV, also along the BNE eastern 
                         coast. The precipitation from this system resulted in 68 mm in 
                         just 4 hours, surpassing the historical February average in 
                         Macei{\'o}, Alagoas. Finally, the third event was caused by the 
                         ITCZ and a Mesoscale Convective System (MCS) convection, resulting 
                         in heavy rains (140 mm/24h) over the Maranh{\~a}o state, 
                         especially in the city of S{\~a}o Lu{\'{\i}}s. Despite the 
                         different circulation patterns of the analyzed synoptic systems, 
                         some similar characteristics were identified, such as intense 
                         moisture convergence and strong wind shear, in addition to 
                         negative surface relative vorticity. Topography played a 
                         significant role. The first case analyzed (on the east coast) 
                         recorded the highest rainfall among the three cases, despite not 
                         presenting cloudiness with great vertical development. This 
                         occurred due to the high convergence of moisture transport 
                         combined with the elevated relief to the west, which facilitated 
                         increased convective activity. Vertical profiles of specific 
                         humidity and vertical air movements proved to be very important 
                         fields for analyzing the circulation patterns of synoptic scale 
                         systems, which in turn have quite different characteristics. 
                         Furthermore, it demonstrated its significance as a valuable 
                         instrument for enhancing comprehension of the vertical 
                         thermodynamic structures of the extreme precipitation events.",
  conference-location = "Baltimore, MD",
      conference-year = "28 jan. - 01 feb. 2024",
             language = "en",
        urlaccessdate = "12 maio 2024"
}