Vertical distributions of SO(2) and NO(2) in the lower atmosphere in Beijing urban areas, China.
Measurements of SO(2) and NO(2) were conducted from January to March 2001 and August 2003 at a 325 m meteorological tower in Beijing. The concentrations of SO(2) and NO(2) observed by passive samplers at ten heights showed complex vertical distributions in winter and summer. The vertical profiles of pollutants were influenced by source emissions, meteorological conditions, urban canopy and other factors. The comparison analysis of winter and summer pollutant concentrations suggests that the decrease in SO(2) concentration was significant in summer, and the reduction of NO(2) was relatively not distinctive. Domestic heating and industrial sources were major sources of SO(2) in urban areas of Beijing. Differing from SO(2,) urban NO(2) was closely related to traffic emission. Meteorological evidence suggests that strong temperature inversions influence vertical distribution of air pollutants over urban Beijing. The high levels of SO(2) and NO(2) concentrations were due to the accumulation of pollutants resulting from the stable atmosphere prevalent during the measurement period. The vertical distributions of air pollutants were controlled and affected by atmospheric dynamical characteristics.
Meng
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ZY
Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081 China. mengyz@cams.cma.gov.cn
Ding
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D000392:Air Movements; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D002681:China; D002947:Cities; D004784:Environmental Monitoring / Q000379:methods*; D009585:Nitrogen Dioxide / Q000032:analysis*; D012621:Seasons; D013458:Sulfur Dioxide / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis
D000393:Air Pollutants; D001335:Vehicle Emissions; D013458:Sulfur Dioxide; D009585:Nitrogen Dioxide