华北电厂源对北京及周边地区SO_2影响

采用MM5、Models-3/CMAQ耦合模型系统,模拟了河北、天津、山西、内蒙古4省市电厂源排放对北京及周边地区SO2质量浓度影响.模拟结果表明,电厂源对华北地区SO2年均贡献质量浓度高值多出现在电厂密集、污染物排放量大的地区,且从南到北呈递减趋势,北京城区、北京全市1月月均贡献质量浓度分别为7.63和7.13μg/m3,4月分别为5.54和5.37μg/m3,7月分别为3.02和3.68μg/m3,10月分别为7.49和7.53μg/m3,年均贡献质量浓度分别为5.92和5.93μg/m3,其中日均最大贡献质量浓度出现在1月,为30.1和19.1μg/m3,分别占国家空气质量二级标准的20.1%和12.7%.研究表明,华北地区电厂源排放对北京市SO2空气质量影响是不能忽视的,能够促使和加剧北京市的大气环境污染.

SO_2 Air Quality Impact on Beijing and Surrounding Region From Power Plant Emissions in North China

An integrated MM5,Models-3/CMAQ modeling system was applied to study SO_2 air quality in Beijing and its surrounding regions by the effects of power plant emissions from Hebei,Tianjin,Shanxi and Inner mongolia.The result of simulation indicated that high SO_2 concentration was appeared in regions with high density of power plants and high emissions magnitude.SO_2 concentration in Beijing was decreased from south to north,with monthly concentration of 7.63 and 7.13 μg/m~3 in January,monthly concentration of 5.54 and 5.37μg/m~3 in April,monthly concentration of 3.02、3.68 μg/m~3 in July,monthly concentration of 7.49、7.53μg/m~3 in October,and annual concentration of 5.92 and 5.93μg/m~3 in 2005,for urban and entire city of Beijing,respectively.The maximal daily concentrations of urban and entire city of Beijing were 30.1 and 19.1μg/m~3 in January,which were 20.1%and 12.7% of the class Ⅱ national air quality standard.Power plant emissions in north China induce or enhance air pollution in Beijing,which should not be neglected.