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| Titel |
Measurements of Volatile Organic Compounds Using Proton Transfer Reaction – Mass Spectrometry during the MILAGRO 2006 Campaign |
| VerfasserIn |
E. C. Fortner, J. Zheng, R. Zhang, W. Berk Knighton, R. M. Volkamer, P. Sheehy, L. Molina, M. André |
| 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. 2 ; Nr. 9, no. 2 (2009-01-21), S.467-481 |
| Datensatznummer |
250006736
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| Publikation (Nr.) |
 copernicus.org/acp-9-467-2009.pdf |
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| Zusammenfassung |
| Volatile organic compounds (VOCs) were measured by proton
transfer reaction – mass spectrometry (PTR-MS) on a rooftop in the urban
mixed residential and industrial area North Northeast of downtown Mexico
City as part of the Megacity Initiative – Local and Global Research
Observations (MILAGRO) 2006 field campaign. Thirty eight individual masses
were monitored during the campaign and many species were quantified
including methanol, acetaldehyde, toluene, the sum of C2 benzenes, the
sum of C3 benzenes, acetone, isoprene, benzene, and ethyl acetate. The
VOC measurements were analyzed to gain a better understanding of the type of
VOCs present in the MCMA, their diurnal patterns, and their origins. Diurnal
profiles of weekday and weekend/holiday aromatic VOC concentrations showed the
influence of vehicular traffic during the morning rush hours and during the
afternoon hours. Plumes including elevated toluene as high as 216 parts per
billion (ppb) and ethyl acetate as high as 183 ppb were frequently observed
during the late night and early morning hours, indicating the possibility of
significant industrial sources of the two compounds in the region. Wind
fields during those peak episodes revealed no specific direction for the
majority of the toluene plumes but the ethyl acetate plumes arrived at the
site when winds were from the Southwest or West. The PTR-MS measurements
combined with other VOC measuring techniques at the field site as well as
VOC measurements conducted in other areas of the Mexico City Metropolitan
Area (MCMA) will help to develop a better understanding of the spatial
pattern of VOCs and its variability in the MCMA. |
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