Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-10-3319-2010
http://www.atmos-chem-phys-discuss.net/10/3319/2010/
http://www.atmos-chem-phys-discuss.net/10/3319/2010/acpd-10-3319-2010.html
http://www.atmos-chem-phys-discuss.net/10/3319/2010/acpd-10-3319-2010.pdf
3319
3346
2010-02-08
Measurements and receptor modeling of volatile organic compounds in south-eastern Mexico City, 2000–2007
H. Wöhrnschimmel
henry.woehrnschimmel@chem.ethz.ch
M. Magaña
W. A. Stahel
S. Blanco
S. Acuña
J. M. Pérez
S. González
V. Gutiérrez
S. Wakamatsu
B. Cárdenas
Instituto Nacional de EcologÃa, Mexico City, Mexico
Institute for Chemical and Bioengineering, ETH Zurich, Switzerland
Seminar for Statistics, ETH Zurich, Switzerland
Instituto Politécnico Nacional, Mexico City, Mexico
Ehime University, Matsuyama, Japan
Ambient samples of volatile organic compounds (VOCs) were measured between
2000 and 2007 in south-eastern Mexico City, quantifying 13 species (ethane,
propane, propylene, butane, acetylene, pentane, hexane, heptane, benzene,
octane, toluene, nonane, o-xylene). These time series were analyzed for
long-term trends, using linear regression models. A main finding was that
the concentrations for several of the quantified VOC species were decreasing
during this period. A receptor model was applied to identify possible VOC
sources, as well as temporal patterns in their respective activities.
Domestic use of liquefied petroleum gas and vehicle exhaust are suggested to
be the principal emission sources, contributing together between 70% and
80% to total VOC. Both diurnal and seasonal patterns, as well as a
weekend effect were recognized in the modelled source activities.
Furthermore, vehicle exhaust emissions showed a decreasing trend over time,
with a reduction of about 8% per year.
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