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RESEARCH ARTICLE
Contents Vol 7(4)

Variations of aerosol properties due to regional source contributions and impacts on ozone levels:a study in a south China city

Ka-Ming Wai A and Peter A. Tanner A B
+ Author Affiliations
- Author Affiliations

A Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region, People’s Republic of China.

B Corresponding author. Email: bhtan@cityu.edu.hk

Environmental Chemistry 7(4) 359-369 https://doi.org/10.1071/EN10020
Submitted: 9 March 2010  Accepted: 25 June 2010   Published: 20 August 2010

Environmental context. Regional atmospheric contaminants from both anthropogenic and natural events (industrial activities, biomass burning, dust events) can have large impacts on the aerosol properties of distant downwind sites. Data showing the influence of regional sources on air quality in Hong Hong are presented. In particular, the changes in aerosol properties (e.g. mass concentration and particle size distribution), and their effects on photochemical ozone formation, is discussed.

Abstract. Variations of PM10 concentration and particle size distribution owing to the influence of industrial activities in mainland China, biomass burning in South East Asia and dust storms in north-west China, as well as the aerosol impact on surface ozone concentration, have been studied by a combination of analysis of air mass origin (by back-trajectory calculation), remote sensing techniques, regional chemical transport and photochemical box models. The PM10 concentrations in Hong Kong were reduced by 24–57% owing to the industrial downtime during the Chinese New Year period. A photochemical box model coupled with a radiative transfer model has been employed to predict surface maximum ozone concentrations during high aerosol loading days. Increase of aerosol optical depth can lead to 7–32% reduction of surface maximum ozone concentration. Our results emphasise the need for regional cooperation in tackling the local air pollution of Hong Kong.

Additional keywords: biomass burning, dust, particle-size distribution, photochemical ozone, regional transport.


Acknowledgements

The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and READY website used herein; and the MODIS imagery of NASA’s Science Mission Directorate, archived and distributed by the Goddard Earth Sciences (GES) Data and Information Services Center (DISC). We thank Dr Janet E. Nichol; the Principal Investigator of the AERONET site in Hong Kong at Hok Tsui, for her effort in establishing and maintaining the site; Dr Peter Louie of HKEPD who provided the organics data measured at the HKEPD’s Central/Western station; and Prof Itsushi Uno and his research team for providing access to the archived products of the CFORS model. We acknowledge the contribution of Mr Elton Chan to the early part of this study.


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