Ground-based remote sensing measurements of aerosol and ozone in an urban area: A case study of mixing height evolution and its effect on ground-level ozone concentrations |
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| Institution: | 1. Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster/Key Laboratory for Aerosol Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China;2. Atmospheric Sciences Research Center, State University of New York, Albany, NY, USA;1. Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, India;2. DST - Mahamana Centre of Excellence in Climate Change Research, Banaras Hindu University, Varanasi, India;3. NASA Ames Research Center, Moffett Field, CA, USA;4. NASA Goddard Space Flight Center, Greenbelt, MD, USA;5. Civil and Environmental Engineering, Technion, Haifa, Israel;1. School of Engineering, University of Basilicata, Viale dell''Ateneo Lucano 10, Potenza 85100, Italy;2. IMAA-CNR C.da Santa Loja, zona Industriale, Tito Scalo, Potenza 85050, Italy |
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| Abstract: | We have estimated the mixing height (MH) and investigated the relationship between vertical mixing and ground-level ozone concentrations in Seoul, Korea, by using three ground-based active remote sensing instruments operating side by side: micro-pulse lidar (MPL), differential absorption lidar (DIAL), and differential optical absorption spectroscopy (DOAS). The MH is estimated from MPL measurements of aerosol extinction profiles by the gradient method under convective conditions. Comparisons of the MHs estimated from MPL and radiosonde measurements show a good agreement (r2=0.99). Continuous MPL measurements with high temporal and vertical resolution reveal the diurnal variations of the MH under convective conditions and the presence of a residual layer during the nighttime. Comprehensive measurements of ozone and aerosol by MPL, DIAL and DOAS during an high ozone episode (24–26 May 2000) in Seoul, Korea, reveal that (1) photochemical ozone production and advection from upwind regions (the western part of Seoul) contribute two peaks of ozone concentrations at the ground around 14:00 and 18:00 local time on 25 May 2000, respectively, and (2) the entrainment and the fumigation processes of ozone aloft in the nighttime residual layer into the ground is a major contributor of high concentrations of ground-level ozone observed on the following day (26 May 2000). |
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