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Spatial distribution and interannual variation of surface PM sub(10) concentrations over eighty-six Chinese cities
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Spatial distribution and interannual variation of surface PM sub(10) concentrations over eighty-six Chinese cities
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Journal Article
Spatial distribution and interannual variation of surface PM sub(10) concentrations over eighty-six Chinese cities
2010
Overview
The spatial distribution of the aerosols over 86 Chinese cities was reconstructed from air pollution index (API) records for summer 2000 to winter 2006. PM sub(10) (particulate matter less than or equal to 10 mu m) mass concentrations were calculated for days when PM sub(10) was the principal pollutant, these accounted for 91.6% of the total 150 428 recorded days. The 83 cities in mid-eastern China (100 degree E to 130 degree E) were separated into three latitudinal zones using natural landscape features as boundaries. Areas with high PM sub(10) level in northern China (127 to 192 mu g m super(-3)) included Urumchi, Lanzhou-Xining, Weinan-Xi'an, Taiyuan-Datong-Yangquan-Changzhi, Pingdingshan-Kaifeng, Beijing-Tianjin-Shijiazhuang, Jinan, and Shenyang-Anshan-Fushun; in the middle zone, high PM sub(10) (119-147 mu g m super(-3)) occurred at Chongqing-Chengdu-Luzhou, Changsha-Wuhan, and Nanjing-Hangzhou; in the southern zone, only four cities (Qujing, Guiyang, Guangzhou and Shaoguan) showed PM sub(10) concentration >80 mu g m super(-3). The median PM sub(10) concentration decreased from 108 mu g m super(-3) for the northern cities to 95 mu g m super(-3) and 55 mu g m super(-3) for the middle and southern zones, respectively. PM sub(10) concentration and the APIs both exhibited wintertime maxima, summertime minima, and the second highest values in spring. PM sub(10)showed evidence for a decreasing trend for the northern cities while in the other zones urban PM sub(10) levels fluctuated, but showed no obvious change over time. The spatial distribution of PM sub(10) was compared with the emissions, and the relationship between the surface PM sub(10) concentration and the aerosol optical depth (AOD) was also discussed.
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