An evaluation of the interaction of morning residual layer and afternoon mixed layer ozone in Houston using ozonesonde data |
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| Authors: | Gary A. Morris Bonne Ford Bernhard Rappenglück Anne M. Thompson Ashley Mefferd Fong Ngan Barry Lefer |
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| Affiliation: | 1. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;3. State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;4. Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Peking University, Beijing 100871, China;5. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science & Technology, Nanjing 210044, China;1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;3. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;4. Max Planck Institute for Chemistry, Mainz 55128, Germany;5. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;6. Department of Earth and Atmospheric Sciences, City College of New York, New York, NY 10031, USA |
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| Abstract: | ![]()
The Tropospheric Ozone Pollution Project (TOPP) launched >220 ozonesondes in Houston (July 2004–June 2008) providing examples of pollution transported into, re-circulated within, and exported from the Houston area. Fifty-one launches occurred during the Texas Air Quality Study (TexAQS) II and the summer portion of IONS-06 (INTEX [Intercontinental Transport Experiment] Ozonesonde Network Study). On 11 days during TexAQS II and on 8 other occasions, ozonesondes were launched both at dawn and in the afternoon. Analysis of these “intensive” launch sequences shows that morning residual layer (RL) ozone concentrations ([O3]) explained 60–70% of the variability found in the afternoon mixed layer (ML). Furthermore, maximum RL [O3] is nearly identical to the mean ML [O3] from the previous afternoon (morning minus afternoon = ?1.6 ± 8.4 ppbv). During TexAQS II, mean [O3] below 1.3 km (the mean ML height from ozonesonde data) increased from 37 ± 22 ppbv in the morning to 74 ± 18 ppbv in the afternoon, suggesting an average net local daily O3 production of ～500–900 tons over the metropolitan Houston area. |
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