HR: 08:15h
AN: A31C-02    [Abstracts]
TI: Flux Emissions of SO₂ and NO₂ Measured at the Tula Industrial Complex (Mexico) during MCMA 2006 Field Campaign using a Mini-DOAS System
AU: * Sosa, G
EM: gsosa@imp.mx
AF: Programa de Matematicas Aplicadas y Computación, Instituto Mexicano del Petróleo. Eje Central Lázaro Cárdenas No. 152, México, DF 07730, Mexico
AU: Rivera, C
EM: claudia.rivera@rss.chalmers.se
AF: Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, 41296, Sweden
AU: Wöhrnschimmel, H
EM: henrywo@ine.gob.mx
AF: Centro Nacional de Investigación y Capacitación Ambiental, Instituto Nacional de Ecología , México, DF 04530, Mexico
AU: de Foy, B
EM: foy@eas.slu.edu
AF: Department of Earth and Atmospheric Sciences, Saint Louis University 300E O'Neil, 3642 Lindell Blvd, St Louis, MO 63108, United States
AU: de Foy, B
EM: foy@eas.slu.edu
AF: Molina Center on Energy and Environment, 3262 Holiday Ct. Suite 201, La Jolla, CA 92037, United States
AU: Johansson, M
EM: mattias.johansson@rss.chalmers.se
AF: Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, 41296, Sweden
AU: Molina, L T
EM: ltmolina@MIT.EDU
AF: Molina Center on Energy and Environment, 3262 Holiday Ct. Suite 201, La Jolla, CA 92037, United States
AB: The Tula industrial zone is located 60 km northeast from the Mexico City Metropolitan Area (MCMA), in the Hidalgo State in México. This region is known as the Tula-Vito-Apasco industrial corridor, where a number of industries are located. According to the latest information from the environmental authority, about 313,000 ton/year of SO₂ and 40,000 ton/year of NO_x are released in this region. The Miguel Hidalgo refinery (MHR) and the Francisco Pérez Ríos power plant (FPRPP) are the main emitters, contributing almost 90% of SO2 and 80% of NO_x from the total emission inside the Hidalgo State. Other industries such as cement plants, open-sky mines and agricultural activities are also responsible for important emissions of particulat matter (PM) into the atmosphere and soil erosion. This highly industrialized region is thought to influence the air quality in the MCMA, where in some occasions SO₂ concentrations in the north part of the city have exceeded the Mexican air quality standard (130 ppb as a 24 hour average), which could not be attributed to irregular operations of industries located in the surrounding area. To address the question of emissions from the refinery and the power plant, the total fluxes of SO₂ and NO₂ were determined by measurements of their respective integrated vertical column in the neighborhood of the Tula industrial zone, using a Mini-DOAS system. These measurements were carried out as part of the MCMA-2006/MILAGRO Field Campaign, from March 24th to April 18th 2006. Meteorological measurements at the height of the plume dispersion were also determined using pilot balloons and radiosondes techniques. The experimental data were complemented by model simulations. Forward Lagrangian stochastic trajectories were calculated to simulate the plume using FLEXPART in combination with meso-scale meteorological simulations with MM5. The experimental data set was used to evaluate model performance. The simulations were used as an additional estimate of plume transport speeds. Potential air quality impacts on the MCMA were simulated. These were verified by combining surface SO2 measurements in the basin with backward trajectories, thereby providing a means of discriminating the urban impacts of different potential source regions.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly