Impact of precursor levels and global warming on peak ozone concentration in the Pearl River Delta Region of China |
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Authors: | WEI Xiaolin LIU Qian Ka Se LAM WANG Tijian |
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Institution: | Meteorological Bureau of Shenzhen Municipality, Shenzhen 518040,
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong;Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong;Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong;School of Atmospheric Science, Nanjing University, Nanjing 210093 |
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Abstract: | The relationship between the emission of ozone precursors and the chemical
production of tropospheric ozone (O3) in the Pearl River Delta Region
(PRD) was studied using numerical simulation. The aim of this study was to
examine the volatile organic compound (VOC)- or nitrogen oxide (NOx
=NO+NO2)-limited conditions at present and when surface temperature is
increasing due to global warming, thus to make recommendations for future
ozone abatement policies for the PRD region. The model used for this
application is the U.S. Environmental Protection Agency's (EPA's)
third-generation air-quality modeling system; it consists of the mesoscale
meteorological model MM5 and the chemical transport model named Community
Multi-scale Air Quality (CMAQ). A series of sensitivity tests were conducted
to assess the influence of VOC and NOx variations on ozone production.
Tropical cyclone was shown to be one of the important synoptic weather
patterns leading to ozone pollution. The simulations were based on a
tropical-cyclone-related episode that occurred during 14--16 September 2004.
The results show that, in the future, the control strategy for emissions
should be tightened. To reduce the current level of ozone to meet the Hong
Kong Environmental Protection Department (EPD) air-quality objective (hourly
average of 120 ppb), emphasis should be put on restricting the increase of
NOx emissions. Furthermore, for a wide range of possible changes in precursor
emissions, temperature increase will increase the ozone peak in the PRD
region; the areas affected by photochemical smog are growing wider, but the
locations of the ozone plume are rather invariant. |
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Keywords: | chemical transport models NOx/VOC-limited conditions photochemical reactivity global warming |
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