Mobile mini-DOAS measurement of the outflow of NO2 and HCHO from Mexico City
Journal article, 2009

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.

Author

Mattias Erik Johansson

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

Claudia Rivera

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

Benjamin de Foy

Wenfang Lei

Jihee Song

Yan Zhang

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

Bo Galle

Chalmers, Department of Radio and Space Science, Optical Remote Sensing

Luisa T. Molina

Atmospheric Chemistry and Physics

1680-7316 (ISSN) 1680-7324 (eISSN)

Vol. 9 5647-5653

Subject Categories

Other Environmental Engineering

DOI

10.5194/acp-9-5647-2009

More information

Created

10/8/2017