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<p>Northeast Brazil (NEB) is one of the driest regions in the country, with some areas, such as the sertão, receiving less than 400&#xa0;mm/year. Despite this aridity, NEB is influenced by various synoptic-scale systems that contribute to intense rainfall events throughout the year. This study aimed to identify and analyze the synoptic-scale atmospheric patterns associated with extreme precipitation events in NEB. There were selected four events that occurred in the region over the past eight years and significantly impacted metropolitan areas. Two cases occurred in eastern, one in southern, and one in northern sector of the study region. The results revealed that these extreme precipitation events were associated with different synoptic-scale systems. The easterly wave disturbance (EWD), upper tropospheric cyclonic vortex (UTCV), South Atlantic convergence zone (SACZ) and intertropical convergence zone (ITCZ). EWD and UTCV were primarily responsible for the two eastern cases. The SACZ influenced the case that occurred in the southern, whereas the Atlantic ITCZ played a role in in northern case. Our findings indicate that these events are driven primarily by intense upper-level divergence and substantial moisture transport from the Atlantic Ocean to the continent, leading to significant moisture convergence. This study provides crucial insights into the factors driving extreme precipitation events in NEB, which can aid in validating numerical weather prediction models.</p>

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Synoptic patterns of extreme precipitation events in Northeast Brazil

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Matheus J. A. Lyra,
  • Helber B. Gomes,
  • Dirceu L. Herdies,
  • Silvio N. Figueroa,
  • Enver Ramirez,
  • José A. Aravéquia,
  • Maria C. L. Silva,
  • Fabricio D. S. Silva,
  • Heliofábio B. Gomes,
  • Eder P. Vendrasco,
  • Leonardo Calvetti,
  • Hugo A. Braga,
  • José A. Mantovani Jr.,
  • Jayant Pendharkar,
  • William Coelho,
  • Mário F. L. Quadro,
  • Débora R. Roberti,
  • César A. A. Beneti,
  • Rafaela L. Costa

摘要

Northeast Brazil (NEB) is one of the driest regions in the country, with some areas, such as the sertão, receiving less than 400 mm/year. Despite this aridity, NEB is influenced by various synoptic-scale systems that contribute to intense rainfall events throughout the year. This study aimed to identify and analyze the synoptic-scale atmospheric patterns associated with extreme precipitation events in NEB. There were selected four events that occurred in the region over the past eight years and significantly impacted metropolitan areas. Two cases occurred in eastern, one in southern, and one in northern sector of the study region. The results revealed that these extreme precipitation events were associated with different synoptic-scale systems. The easterly wave disturbance (EWD), upper tropospheric cyclonic vortex (UTCV), South Atlantic convergence zone (SACZ) and intertropical convergence zone (ITCZ). EWD and UTCV were primarily responsible for the two eastern cases. The SACZ influenced the case that occurred in the southern, whereas the Atlantic ITCZ played a role in in northern case. Our findings indicate that these events are driven primarily by intense upper-level divergence and substantial moisture transport from the Atlantic Ocean to the continent, leading to significant moisture convergence. This study provides crucial insights into the factors driving extreme precipitation events in NEB, which can aid in validating numerical weather prediction models.