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

Autor: Mang Lin, Iat-Neng Chan, Chuen-Yu Chan, Guenter Engling, William Bloss
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Tellus: Series B, Chemical and Physical Meteorology, Vol 64, Iss 0, Pp 1-16 (2012)
Druh dokumentu: article
ISSN: 0280-6509
1600-0889
DOI: 10.3402/tellusb.v64i0.19625
Popis: 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
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