distúrbio ondulatório de leste e seus impactos na cidade de salvador wavelike easterly disturbance and its impacts on salvador city

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ID: 244899
2012
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Abstract
Um evento extremo de chuva registrado na cidade de Salvador, Bahia, é investigado neste trabalho. Dados observacionais de superfície e altitude, dados em pontos de grade, imagens de satélite meteorológico e informações de desastres fornecidas pela Defesa Civil de Salvador (CODESAL) foram utilizados na análise. No período entre a meia noite e 3 horas da madrugada do dia 12 de junho de 2006, a precipitação acumulada foi de 51 mm. Um número elevado de ocorrências foi registrado pela CODESAL, notadamente deslizamentos de encosta. Ventos fracos em toda a troposfera e energia potencial convectiva disponível máxima de 3.233 J kg-1 foram diagnosticados em Salvador no dia 11 de junho, quinze horas antes do período de chuva forte. Áreas de convecção profunda caracterizaram esse evento provocado por uma onda que chegou à costa leste do Nordeste do Brasil, após se propagar para oeste sobre o Atlântico Sul com velocidade de fase estimada de 10 m s-1, conforme evidenciado no campo da componente meridional do vento no nível de 700 hPa e em imagens de satélite meteorológico.
An extreme rainfall event registered in the city of Salvador, Bahia, is investigated in this work. Observational surface and upper air data, gridpoint data, meteorological satellite images and disasters information provided by the Civil Defense of Salvador (CODESAL) were used in the analysis. During the period from midnight to 3 A.M. on 12 June 2006 51 mm accumulated rainfall was registered. A high number of disasters were registered by CODESAL, particularly landslides. Weak winds throughout the troposphere and maximum convective available potential energy of 3,233 J kg-1 were identified in Salvador on June 11th, fifteen hours before the heavy rainfall. Areas of deep convection characterized this event, favored by a wave that reached the eastern coast of Northeast Brazil after moving westward over the South Atlantic with an estimated phase speed of 10 m s-1, as seen on the meridional wind component field at the 700 hPa level and on meteorological satellite images.
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Authors ;Andréa Helena Machado dos Santos;Maria Regina da Silva Aragão;Magaly de Fatima Correia;Heráclio Alves de Araujo;Alexsandra Barbosa Silva
Journal Applied microbiology and biotechnology
Year 2012
DOI
10.1590/S0102-77862012000300010
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862012000300010
Keywords
urban area climatology nordeste do brasil northeast brazilmeteorology

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