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Original Research Papers

A numerical study of influences of urban land-use change on ozone distribution over the Pearl River Delta region, China

Authors:

X.M. Wang ,

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, CN
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W. S. Lin,

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, CN
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L.M. Yang,

Joint Laboratory for Geo-Information Science, Institute of Space and Earth Information Science, the Chinese University of Hong Kong, HK
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R.R. Deng,

School of Geographical Science and Planning, Sun Yat-sen University, Guangzhou, CN
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H. Lin

Joint Laboratory for Geo-Information Science, Institute of Space and Earth Information Science, the Chinese University of Hong Kong, HK
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Abstract

Atmospheric dynamical and chemical models are conducted to explore impacts of urban land-use change on ozone concentrations over the Pearl River Delta (PRD) region, China. Two scenarios of land-use distributions are used to represent early 1990s and current urban land-use distributions. Urbanization increases 2-d averaged daytime (nighttime) temperature by 0.8°C (1.5 °C) and reduces wind speed by about 20% over the PRD urban areas. The daytime boundary layer depth is up to 400 m deeper, while there is a 50-m increase during nighttime. The combination of these seemly subtle changes in meteorological conditions is able to prompt detectable changes in surface O3 concentration (4.15 ppbv) over major PRD urban areas. Nighttime O3 concentration enhancement is greater than daytime in the urban expansion regions (e.g. 10 ppbv daytime and 15 ppbv nighttime). Areas with main O3 concentrations increase coincide with the areas of increased temperature and decreased wind speed, and the timing of maximum ozone concentration increase occurs a few hours later than maximum temperature increase and wind-speed reduction. Moreover, planetary boundary layer depth also plays an important role in modulating vertical transport of O3, which can lead to daytime surface ozone concentrations reduction in some regions even with increasing temperatures.

How to Cite: Wang, X.M., Lin, W.S., Yang, L.M., Deng, R.R. and Lin, H., 2007. A numerical study of influences of urban land-use change on ozone distribution over the Pearl River Delta region, China. Tellus B: Chemical and Physical Meteorology, 59(3), pp.633–641. DOI: http://doi.org/10.1111/j.1600-0889.2007.00271.x
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  Published on 01 Jan 2007
 Accepted on 26 Jan 2007            Submitted on 30 Apr 2006

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