Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
6
12
2006
10.5194/acp-6-4545-2006
http://www.atmos-chem-phys.net/6/4545/2006/
http://www.atmos-chem-phys.net/6/4545/2006/acp-6-4545-2006.html
http://www.atmos-chem-phys.net/6/4545/2006/acp-6-4545-2006.pdf
4545
4557
2006-10-09
Separation of emitted and photochemical formaldehyde in Mexico City using a statistical analysis and a new pair of gas-phase tracers
A. R. Garcia
agustin@atmosfera.unam.mx
R. Volkamer
L. T. Molina
M. J. Molina
J. Samuelson
J. Mellqvist
B. Galle
S. C. Herndon
C. E. Kolb
Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Inst. of Technology, Cambridge, MA 01239-4307, USA
Chalmers Tekniska Hoegskola, Goeteborg, Sweden
Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc. Billerica, MA 01821-3976, USA
Photochemical pollution control strategies require an understanding of
photochemical oxidation precursors, making it important to distinguish
between primary and secondary sources of HCHO. Estimates for the relative
strengths of primary and secondary sources of formaldehyde (HCHO) were
obtained using a statistical regression analysis with time series data of
carbon monoxide (CO) and glyoxal (CHOCHO) measured in the Mexico City
Metropolitan Area (MCMA) during the spring of 2003. Differences between
Easter week and more typical weeks are evaluated. The use of CO-CHOCHO as
HCHO tracers is more suitable for differentiating primary and secondary
sources than CO-O<sub>3</sub>. The application of the CO-O<sub>3</sub> tracer pair to
mobile laboratory data suggests a potential in-city source of background
HCHO. A significant amount of HCHO observed in the MCMA is associated with
primary emissions.
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