Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-15189-2007
http://www.atmos-chem-phys-discuss.net/7/15189/2007/
http://www.atmos-chem-phys-discuss.net/7/15189/2007/acpd-7-15189-2007.html
http://www.atmos-chem-phys-discuss.net/7/15189/2007/acpd-7-15189-2007.pdf
15189
15212
2007-10-25
Characterizing mega-city pollution with TES O<sub>3</sub> and CO measurements
C. Shim
cshim@jpl.nasa.gov
Q. Li
M. Luo
S. Kulawik
H. Worden
J. Worden
A. Eldering
G. Diskin
G. Sachse
A. Weinheimer
D. Knapp
D. Montzca
T. Campos
Jet Propulsion Laboratory, California Institute of Technology, CA, USA
NASA Langley Research Center, CO, USA
National Center for Atmospheric Research (NCAR), VA, USA
Concurrent tropospheric O<sub>3</sub> and CO vertical profiles from the
Tropospheric Emission Spectrometer (TES) during the MILAGRO/INTEX-B aircraft
campaigns over the Mexico City Metropolitan Area (MCMA) allow us to
characterize mega-city pollution. Outflow from the MCMA occurred
predominantly at 600–800 hPa, evident in O<sub>3</sub>, CO, and NO<sub>x</sub>
enhancements in the in situ observations. We examined O<sub>3</sub>, CO, and their
correlation at 600–800 hPa from TES retrievals, aircraft measurements, and
GEOS-Chem model results over the aircraft coverage (within a radius of ~700 km around MCMA). The enhancements in O<sub>3</sub> and CO seen in the in situ
measurements are not apparent in TES data, due to the lack of TES coverage
during several strong pollution events. However, TES O<sub>3</sub> and CO data are
consistent with the aircraft observations on a daily mean basis (50–60 ppbv and 100–130 ppbv for O<sub>3</sub> and CO respectively). The O<sub>3</sub>-CO
correlation coefficients and enhancement ratios (ΔO<sub>3</sub>/ΔCO) derived from TES data are in good agreements with those derived from
the aircraft observations and GEOS-Chem model results (<i>r</i> : 0.5–0.9; ΔO<sub>3</sub>/ΔCO: 0.3–0.4), reflecting significant springtime
photochemical production over MCMA and the surrounding region.
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