Nocturnal boundary layer characteristics and land breeze development in Houston,Texas during TexAQS II |
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| Authors: | Bridget M Day Bernhard Rappenglück Craig B Clements Sara C Tucker W Alan Brewer |
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| Institution: | 1. Department of Earth and Atmospheric Sciences, University of Houston, 4800 Calhoun Rd, Houston, TX 77204-5007, USA;2. Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, 325 Broadway, Boulder, CO 80305, USA;3. NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, USA;1. Laboratory of Isotope Geology and Geoecology, Department Applied Geology and Geochemistry, Institute of Geological Sciences, University of Wroc?aw, Cybulskiego 30, 50-205 Wroclaw, Poland;2. Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, 38116 Braunschweig, Germany;1. Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece;2. Department of Meteorology and Climatology, Aristotle University of Thessaloniki, Thessaloniki, Greece;3. Finnish Meteorological Institute, Kuopio, Finland;4. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens 15236, Greece;1. Department of Architecture and Building Science, Graduate School of Engineering, Tohoku University, Japan;2. School of Environment and Society, Tokyo Institute of Technology, Japan;3. The Faculty of Architecture, The University of Hong Kong, Hong Kong;4. School of Architecture, The Chinese University of Hong Kong, Hong Kong;5. Department of Architecture, Faculty of Engineering, Tohoku Institute of Technology, Japan |
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| Abstract: | The nocturnal boundary layer in Houston, Texas was studied using a high temporal and vertical resolution tethersonde system on four nights during the Texas Air Quality Study II (TexAQS II) in August and September 2006. The launch site was on the University of Houston campus located approximately 4 km from downtown Houston. Of particular interest was the evolution of the nocturnal surface inversion and the wind flows within the boundary layer. The land–sea breeze oscillation in Houston has important implications for air quality as the cycle can impact ozone concentrations through pollutant advection and recirculation. The results showed that a weakly stable surface inversion averaging in depth between 145 and 200 m AGL formed on each of the experiment nights, typically within 2–3 h after sunset. Tethersonde vertical winds were compared with two other Houston data sets (High Resolution Doppler Lidar and radar wind profiler) from locations near the coastline and good agreement was found, albeit with a temporal lag at the tethersonde site. This comparison revealed development of a land breeze on three nights which began near the coastline and propagated inland both horizontally and vertically with time. The vertical temperature structure was significantly modified on one night at the tethersonde site after the land breeze wind shift, exhibiting near-adiabatic profiles below 100 m AGL. |
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