Variability of boundary layer processes for the metropolitan area of São Paulo during winter
DOI:
https://doi.org/10.5902/2179460X36913Abstract
As variações espaciais e temporais da Camada Limite planetária (CLP) da Área Metropolitana da cidade de São Paulo (RMSP) durante o período de 23 de julho a 15 de Agosto de 1999 são estudas utilizando dados de um Sodar Doppler. RMSP (λ = 23º34’ S e φ = 46º44’ W) está numa altitude de 800 m acima do nível médio do mar, localizada 60 km à noroeste do oceano Atlântico, limitada por cadeias de montanhas ao norte, tendo uma orografia complexa e configura-se numa ilha de calor urbana.
Este trabalho tem o objetivo de entender o impacto da urbanização sobre os processos de CLP particularmente durante a estação de inverno. Um número de diferentes tipos de experimentos estiveram em operação durante uma campanha de inverno organizada pelo IAG-USP. O Sodar Doppler fornece dados sobre (i) função estrutura de temperatura, CT2, (ii) velocidade do vento horizontal, u, (iii) velocidade do vento vertical, w, (iv) desvios padrão do vento horizontal e vertical, σu, σv e σw, e (v) altura da inversão de temperatura, Zi.
A análise dos dados fornecidos pelo Sodar mostra claramente as variações desses parâmetros em alturas indo de 50 m até 1500 m com intervalos de 50 m num intervalo de tempo de 15 minutos. Existe grande variação desses parâmetros com a altura.
O aumento noturno no campo do vento horizontal com a altura é bem marcado indicando a quase ausência de transporte vertical de momento horizontal durante a noite em condições estáveis. Durante as horas da manhã a aceleração na velocidade do vento é evidente. O aumento anormal em Zi durante a noite sob condições estáveis prevalece durante o inverno com valores mais altos em agosto do que em julho.Downloads
References
Freitas, E. D., M. A. F. Silva Dias, K. N. Nair and P. L. Silva Dias, 1999: Use of Doppler Sodar in Atmospheric Measurements. Workshop on Physics of the Planetary Boundary Layer and Dispersion Process Modelling.
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