HR: 1400h
AN: A43A-09    [Abstracts]
TI: First Experimental Campaign For Meteorological And Ozone Vertical Soundings And Surface Pollutants Measurements In The Metropolitan Area Of São Paulo, Fall-2006.
AU: * Albuquerque, T T
EM: taciana@model.iag.usp.br
AF: Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Rua do Matao, 1226. Cidade Universitaria., Sao Paulo, SP 05508-900, Brazil
AU: Pinheiro, S d
EM: samya@model.iag.usp.br
AF: Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Rua do Matao, 1226. Cidade Universitaria., Sao Paulo, SP 05508-900, Brazil
AU: Leme, N P
EM: nleme@dge.inpe.br
AF: Department of Spacial Geophysics(GES). National Institute of Spacial Research (INPE), Av. dos Astronautas, 1758 - Jd. da Granja, São José dos Campos, SP 12227-010, Brazil
AU: Andrade, M
EM: mftandra@model.iag.usp.br
AF: Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Rua do Matao, 1226. Cidade Universitaria., Sao Paulo, SP 05508-900, Brazil
AB: Frequently the air quality standards are exceeded in the Metropolitan Area of São Paulo, MASP, mainly due to the emitted gases of the vehicles, reason why great emphasis has been given to the control of the vehicle emissions. Regarding ozone, the dominant situation leads to the need of the control of the volatile organic compounds and oxides of nitrogen, which are the ozone precursors through photochemical processes. Besides the ozone, these processes also generate a range of aggressive substances, generally denominated photochemical oxidizers. Additionally they generate a considerable amount of secondary organic aerosols that, due to their small size, have significant health importance. A pioneering campaign was carried out in the Metropolitan Area of São Paulo (MASP), Brazil. Hourly measurements of the gases NOx, NO, NO2 (on the surface) and O3 (on the surface and in altitude) were carried out from May 12th to May 29th, 2006. This campaign was organized by the group LAPAT together with Instituto Nacional de Pesquisas Espaciais and São Paulo Environmental Protection Agency. Meteorological radiosondes coupled with ozonesoundes were released. The sounds were launched on May 15th (14h50min and 21h18min), May 16th (02h30min, 16h30min and 18h30min), May 17th (00h50min, 10h30min and 14h50min) and on May 18th (06:00 and 11:00), totaling 10 releases. They measured the following variables in the vertical structure of the atmosphere: pressure (mb), relative humidity (%), temperature (°C), altitude (m), currents and ozone (nb). Comparing the measurements of ozone carried out on the surface with those of the first point in altitude that the radiosondes measured, it was observed that there is a good correlation among these values of concentration of ozone (r2 = 0,746). The May 15th and May 16th measurements presented an increase in the concentration of the ozone during dawn, the same doesn't happen on the following days. Since the ozone is not formed during the night, this increase is probably originated from the transport of this pollutant from other levels. This study has great importance for it will be used as input in the validation of air quality models and to describe the evolution and formation of secondary pollutants.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly