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10.5194/acpd-8-5979-2008
http://www.atmos-chem-phys-discuss.net/8/5979/2008/
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http://www.atmos-chem-phys-discuss.net/8/5979/2008/acpd-8-5979-2008.pdf
5979
6007
2008-03-26
Tropospheric ozone sources and wave activity over Mexico City and Houston during MILAGRO/Intercontinental Transport Experiment (INTEX-B) Ozonesonde Network Study, 2006 (IONS-06)
A. M. Thompson
anne@met.psu.edu
J. E. Yorks
S. K. Miller
J. C. Witte
K. M. Dougherty
G. A. Morris
D. Baumgardner
L. Ladino
B. Rappenglueck
The Pennsylvania State University, Department of Meteorology, 503 Walker Building, University Park, PA 16802-5013, USA
SSAI of Lanham, MD 20706 USA
Valparaiso University, Dept of Physics and Astronomy, Valparaiso, IN 46383, USA
UNAM (Autonomous University of Mexico), CCA – Center for Chemistry of the Atmosphere, Mexico City, DF, Mexico
University of Houston, Geosciences Department, Old Sciences Bldg, Houston, Texas 77204-5007, USA
also at: NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
During the INTEX-B (Intercontinental Chemical Transport Experiment)/MILAGRO
(Megacities Initiative: Local and Global Research Observations) experiments
in March 2006 and the associated IONS-06 (INTEX Ozonesonde Network Study;
<a href="http://croc.gsfc.nasa.gov/intexb/ions06.html" target="_blank">http://croc.gsfc.nasa.gov/intexb/ions06.html</a>), regular
ozonesonde launches were made over 15 North American sites. The soundings
were strategically positioned to study inter-regional flows and
meteorological interactions with a mixture of tropospheric O<sub>3</sub> sources:
local pollution; O<sub>3</sub> associated with convection and lightning;
stratosphere-troposphere exchange. The variability of tropospheric O<sub>3</sub>
over the Mexico City Basin (MCB; 19 N, 99 W) and Houston (30 N, 95 W) is
reported here. MCB and Houston profiles displayed a double tropopause in
most soundings and a subtropical tropopause layer with frequent wave
disturbances, identified through O<sub>3</sub> laminae as gravity-wave induced.
Ozonesondes launched over both cities in August and September~2006 (IONS-06,
Phase 3) displayed a thicker tropospheric column O<sub>3</sub> (~7 DU or
15–20%) than in March 2006; nearly all of the increase was in the free
troposphere. In spring and summer, O<sub>3</sub> laminar structure manifested
mixed influences from the stratosphere, convective redistribution of O<sub>3</sub>
and precursors, and O<sub>3</sub> from lightning NO. Stratospheric O<sub>3</sub> origins
were present in 39% (MCB) and 60% (Houston) of the summer sondes.
Comparison of summer 2006 O<sub>3</sub> structure with summer 2004 sondes
(IONS-04) over Houston showed 7% less tropospheric O<sub>3</sub> in 2006. This
may reflect a sampling contrast, August to mid-September 2006 instead of
July–mid August 2004.
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