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Implications of regional surface ozone increases on visibility degradation in southeast China

Lin, Mang; Chan, Iat-Neng; Chan, Chuen-Yu; Engling, Guenter; Bloss, William

Authors

Mang Lin

Iat-Neng Chan

Chuen-Yu Chan

Guenter Engling

William Bloss



Abstract

Long-term visibility (1968–2010) and air pollutant (1984–2010) data records in Hong Kong reveal that the occurrence of reduced visibility (RV, defined as the percentage of hours per month with visibility below 8 km in the absence of rain, fog, mist or relative humidity above 95%) in southeast China has increased significantly in the last four decades. The most pronounced rate of increase was observed after 1990 (nine times higher than that before 1990), when notable increases in surface ozone (O3) levels were simultaneously observed (1.06 µg m−3 per yr). The greatest increases in RV, and in O3, NO2 and SO2 concentrations are coincident in the autumn (1.47, 0.20 and 0.45 µg m−3 per yr respectively), when southeast China is strongly influenced by regional O3 formation and accumulation due to continental outflow of pollution from the east China coast under favourable meteorological conditions. Multiple regression revealed that the RV percentage correlated well (p

Journal Article Type Article
Journal Tellus B: Chemical and Physical Meteorology
Print ISSN 0280-6509
Electronic ISSN 1600-0889
Publisher Taylor & Francis Open
Peer Reviewed Peer Reviewed
Volume 64
Issue 1
Article Number 19625
Institution Citation Lin, M., Chan, I., Chan, C., Engling, G., & Bloss, W. (in press). Implications of regional surface ozone increases on visibility degradation in southeast China. Tellus B, 64(1), doi:10.3402/tellusb.v64i0.19625
DOI https://doi.org/10.3402/tellusb.v64i0.19625
Keywords visibility; surface ozone; secondary particle; atmospheric oxidation capacity
Publisher URL http://www.tandfonline.com/doi/full/10.3402/tellusb.v64i0.19625
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0
Additional Information Mang Lin, Iat-Neng Chan, Chuen-Yu Chan, Guenter Engling & William Bloss (2012) Implications of regional surface ozone increases on visibility degradation in southeast China,
Tellus B: Chemical and Physical Meteorology, 64:1, 19625, DOI: 10.3402/tellusb.v64i0.19625

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0



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