Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-13561-2007
http://www.atmos-chem-phys-discuss.net/7/13561/2007/
http://www.atmos-chem-phys-discuss.net/7/13561/2007/acpd-7-13561-2007.html
http://www.atmos-chem-phys-discuss.net/7/13561/2007/acpd-7-13561-2007.pdf
13561
13596
2007-09-17
Non-methane hydrocarbons source apportionment at different sites in Mexico City during 2002–2003
E. Vega
evega@imp.mx
G. Sanchez
L. Molina
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Nm. 152.Col, San Bartolo Atepehuacan, Delegación Gustavo A. Madero, 07730, México, D.F., Mexico
Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
Molina Center for Energy and the Environment, La Jolla, CA, USA
The atmospheric concentrations of a variety of non-methane hydrocarbons (NMHC)
collected at different sites, representing urban and rural environments within Mexico City
Metropolitan Area (MCMA) during 1997, 2002 and 2003 field campaigns, were compared
and used as an input for the Chemical Mass Balance (CMB) receptor model to determine
the source contribution of NMHC to the atmosphere.
A common feature at all the locations was the dominance of alkenes (59%), aromatics
(16%) and olefins (9%) in the average NMHC burden. At the urban sites the interquartile
range of NMHC concentrations showed stabilization over this period with a slight increase
in the concentrations of propane and butanes in the southwest site of the MCMA in 2003
due to the increased use of liquefied petroleum gas (LPG).
The receptor model CMB version 8.0 was used to apportion the NMHC sources at six
locations within the MCMA, representing the heavily industrialized, commercial,
residential and rural areas. For the 2003 field campaign, the contribution of vehicular
emissions dominated the NMHC concentrations (19.7%±7.1% for gasoline vehicles and
35.4%±17.5% for diesel vehicles) followed by the emissions of marketing and handling of
LPG (29.9%±8.0%).
<br><br>
The NMHC concentrations showed a weekly cycle with the highest levels towards the end
of the week and lowest at weekend and beginning of the week, suggesting that both
emissions and accumulations process play a key role in building up NMHC levels. The
toluene to benzene ratio was used to determine photochemical ageing of the air samples
during the 2003 field campaign. The database was divided into periods with similar wind
circulation pattern; the results suggest that ageing process within the MCMA is generally
suppressed by the amount of fresh emissions.
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