avaliação da influência de condições meteorológicas na ocorrência e manutenção de um episódio prolongado com altas concentrações de ozônio sobre a região metropolitana de são paulo evaluation of the meteorological conditions influence on the occurrence and maintenance of a multiday episode with high ozone concentrations over the metropolitan area of são paulo
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2012
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Abstract
Na Região Metropolitana de São Paulo, a rede de monitoramento da qualidade do ar registra frequentemente valores de concentração de ozônio superiores aos estabelecidos pela legislação em vigor no Brasil. Em algumas ocasiões, condições meteorológicas favoráveis ao processo de formação de ozônio possibilitam a ocorrência de altas concentrações de ozônio durante diversos dias consecutivos na região. A influência de condições meteorológicas no episódio de poluição, registrado entre os dias de 24 de fevereiro e 05 de março de 2003, foi avaliada através de simulações numéricas com o modelo SPM-BRAMS. Estudos observacionais mostram que a ocorrência de ventos fracos, principalmente, durante o período noturno e durante as manhãs, favorece a formação de altas concentrações de ozônio sobre a região. O horário de entrada e a atuação da brisa marítima são fundamentais para o transporte do ozônio e de seus precursores. Essas condições foram bem simuladas pelo modelo. Para os dias mais críticos, quando diversas estações de monitoramento registraram a ocorrência de violações ao padrão nacional de qualidade do ar, o modelo simulou adequadamente as condições atmosféricas determinantes para a manutenção de valores elevados nas concentrações de ozônio, sem a necessidade de nenhum procedimento artificial ao longo das integrações.
In the Metropolitan Area of Sao Paulo, air quality monitoring network often register ozone concentration values higher than those established by Brazilian legislation. In some occasions, weather conditions favorable to ozone formation allow the occurrence of high concentration values for several consecutive days in the area. The influence of meteorological conditions on the air pollution episode registered between February 24 and March 05, 2003 was assessed through numerical simulations with the SPM-BRAMS model. Observational studies show that the occurrence of calm winds, especially during the night and morning, favor the formation of high ozone concentration values over the region. The penetration time and the influence of the sea breeze are essential for the transport of ozone and its precursors. These conditions were well simulated by the model. For the most critical days, when several monitoring stations recorded the occurrence of violations to the ozone National Air Quality Standard, the model simulated properly the atmospheric conditions needed for the maintenance of high ozone concentration values, without any artificial procedure during the integrations.
In the Metropolitan Area of Sao Paulo, air quality monitoring network often register ozone concentration values higher than those established by Brazilian legislation. In some occasions, weather conditions favorable to ozone formation allow the occurrence of high concentration values for several consecutive days in the area. The influence of meteorological conditions on the air pollution episode registered between February 24 and March 05, 2003 was assessed through numerical simulations with the SPM-BRAMS model. Observational studies show that the occurrence of calm winds, especially during the night and morning, favor the formation of high ozone concentration values over the region. The penetration time and the influence of the sea breeze are essential for the transport of ozone and its precursors. These conditions were well simulated by the model. For the most critical days, when several monitoring stations recorded the occurrence of violations to the ozone National Air Quality Standard, the model simulated properly the atmospheric conditions needed for the maintenance of high ozone concentration values, without any artificial procedure during the integrations.
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| Authors | ;Vanessa Silveira Barreto Carvalho;Edmilson Dias de Freitas;Caroline Rosario Mazzoli;Maria de Fátima Andrade |
| Journal | Applied microbiology and biotechnology |
| Year | 2012 |
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