Vertical ozone distributions observed using tethered ozonesondes in a coastal industrial city, Kaohsiung, in southern Taiwan |
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Authors: | Ching-Ho Lin Chin-Hsing Lai Yee-Lin Wu Hsin-Chih Lai Po-Hsiung Lin |
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Institution: | (1) Department of Environmental Engineering and Science, Fooyin University, 151 Ching-Hsuen Road, Ta-Liao Hsiang, Kaohsiung Hsien 831, Taiwan, ROC;(2) Department of Environmental Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC;(3) Center for Teacher Education, Chang Jung Christian University, Tainan, Taiwan, ROC;(4) Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan, ROC |
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Abstract: | This work presents the vertical distributions of ozone and meteorological parameters observed with tethered ozonesondes and
meteorological radiosondes in the lower atmosphere during an ozone episode on March 25–27, 2003, in Kaohsiung City in southern
Taiwan. Kaohsiung is a coastal industrial city with inland mountain ranges to the east. Extremely complicated ozone structures
were identified that spanned day and night during the experimental period. During afternoons, the lower atmosphere was divided
into two stratified air layers with substantially different ozone concentrations. On the episode day (March 26), average ozone
concentration in the near-ground layer was 85 ppb and the aloft layer was 140 ppb. A very high ozone peak of 199 ppb measured
aloft likely resulted from an elevated large point source. Several no-ozone air layers, distributed throughout 400–750 m,
were observed to transport onshore during the nigh. As well, elevated ozone layers peaking at 60–90 ppb and 90–160 ppb were
detected below and above the no-ozone air layers, respectively. These complicated ozone structures were likely formed through
titration of plumes from large point sources and the circulations of sea breezes or combined sea-breeze/mountain flows in
the study area. |
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Keywords: | Coastal complex terrain Local circulation Ozone Ozonesonde Plume |
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