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| Titel |
Mobile mini-DOAS measurement of the outflow of NO2 and HCHO from Mexico City |
| VerfasserIn |
M. Johansson, C. Rivera, B. Foy, W. Lei, J. Song, Y. Zhang, B. Galle, L. Molina |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 15 ; Nr. 9, no. 15 (2009-08-10), S.5647-5653 |
| Datensatznummer |
250007562
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| Publikation (Nr.) |
 copernicus.org/acp-9-5647-2009.pdf |
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| Zusammenfassung |
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. |
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