Mobile mini-DOAS measurement of the outflow of NO<sub>2</sub> and HCHO from Mexico City
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Published:2009-08-10
Issue:15
Volume:9
Page:5647-5653
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Johansson M.,Rivera C.,de Foy B.,Lei W.,Song J.,Zhang Y.,Galle B.,Molina L.
Abstract
Abstract. We here present the results from mobile measurements using two ground-based zenith viewing Differential Optical Absorption Spectroscopy (DOAS) instruments. The measurement was performed in a cross-section of the plume from the Mexico City Metropolitan Area (MCMA) on 10 March 2006 as part of the MILAGRO field campaign. The two instruments operated in the UV and the visible wavelength region respectively and have been used to derive the differential vertical columns of HCHO and NO2 above the measurement route. This is the first time the mobile mini-DOAS instrument has been able to measure HCHO, one of the chemically most important and interesting gases in the polluted urban atmosphere. Using a mass-averaged wind speed and wind direction from the WRF model the instantaneous flux of HCHO and NO2 has been calculated from the measurements and the results are compared to the CAMx chemical model. The calculated flux through the measured cross-section was 1.9 (1.5–2.2) kg/s of HCHO and 4.4 (4.0–5.0) kg/s of NO2 using the UV instrument and 3.66 (3.63–3.73) kg/s of NO2 using the visible light instrument. The modeled values from CAMx for the outflow of both NO2 and HCHO, 1.1 and 3.6 kg/s, respectively, show a reasonable agreement with the measurement derived fluxes.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference40 articles.
1. % vor jede Referenz Atkinson, R.: Atmospheric chemistry of VOCs and NOx., Atmos. Environ., 34, 2063–2101, 2000. 2. % vor jede Referenz Baez, A., Padilla, H., Garcia, R., Torres, M., Rosas, I., and Belmont, R.: Carbonyl levels in indoor and outdoor air in Mexico City and Xalapa, Mexico., Sci. Total Environ., 302, 211–226, 2003. 3. % vor jede Referenz Baez, A. P., Belmont, R., and Padilla, H.: Measurements of formaldehyde and acetaldehyde in the atmosphere of Mexico City., Environ. Pollut., 89, 163–167, 1995. 4. % vor jede Referenz Baez, A. P., Padilla, H., Garcia, R., Belmont, R., and Torres, M.: Measurement of indoor-outdoor carbonyls at four residential homes in Mexico City Metropolitan Area, Int. J. Environ. Pollut., 26, 90–105, 2006. 5. % vor jede Referenz Bogumil, K., Orphal, J., Homann, T., Voigt, S., Spietz, P., Fleischmann, O. P., Vogel, A., Hartmann, M., Bovensmann, H., Frerik, J., and Burrows, J. P.: Measurements of Molecular Absorption Spectra with the SCIAMACHY PreFlight Model: Instrument Caracterization and Reference Data for Atmospheric Remote-Sensing in the 230–2380 nm Region, J. Photoch. Photobio. A, 157, 167–184, 2003.
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