References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-8-5113-2008

Tropospheric ozone sources and wave activity over Mexico City and Houston during MILAGRO/Intercontinental Transport Experiment (INTEX-B) Ozonesonde Network Study, 2006 (IONS-06)

Thompson

A. M.

¹ Yorks

J. E.

¹ Miller

S. K.

¹ Witte

J. C.

² ⁶ Dougherty

K. M.

¹ Morris

G. A.

³ Baumgardner

⁴ Ladino

⁴ Rappenglück

⁵

The Pennsylvania State University, Department of Meteorology, 503 Walker Building, University Park, PA, USA

SSAI of Lanham, MD, USA

Valparaiso University, Dept. of Physics and Astronomy, Valparaiso, IN, USA

UNAM (Autonomous University of Mexico), CCA – Center for Chemistry of the Atmosphere, Mexico City, Mexico

University of Houston, Geosciences Department, Old Sciences Bldg, Houston, TX, USA

also at: NASA/Goddard Space Flight Center, Greenbelt, MD, USA

02 09 2008

8 17 5113 5125

2008

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The full text article is available as a PDF file from https://acp.copernicus.org/articles/8/5113/2008/acp-8-5113-2008.pdf

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 O3 sources: local pollution; O3 associated with convection and lightning; stratosphere-troposphere exchange. The variability of tropospheric O3 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 O3 laminae as gravity-wave induced. Ozonesondes launched over both cities in August and September 2006 (IONS-06, Phase 3) displayed a thicker tropospheric column O3 (~7 DU or 15–20%) than in March 2006; nearly all of the increase was in the free troposphere. In spring and summer, O3 laminar structure manifested mixed influences from the stratosphere, convective redistribution of O3 and precursors, and O3 from lightning NO. Stratospheric O3 origins were present in 39% (MCB) and 60% (Houston) of the summer sondes. Comparison of summer 2006 O3 structure with summer 2004 sondes (IONS-04) over Houston showed 7% less tropospheric O3 in 2006. This may reflect a sampling contrast, August to mid-September 2006 instead of July-mid August 2004.

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