北京地区边界层大气臭氧浓度变化特征分析

利用2001-03～2006-10的大气臭氧探空资料,分析了近6 a北京边界层（2 km以下）大气臭氧浓度的平均月变化和季节变化规律.结果表明,边界层大气臭氧浓度的月变化很明显,1月臭氧浓度最小,地面臭氧浓度不到10×10^-9(体积分数,下同),上层（即2 km）臭氧浓度也不到50×10^-9.而6月臭氧浓度最大,地面达到85×10^-9,上层大于90×10^-9.臭氧浓度具有明显的季节特征,从臭氧浓度值来看,冬季最小,夏季最大.从地面到上层的臭氧浓度的变化幅度来看,冬季变化最大,夏季变化最小.根据廓线变化方式,臭氧浓度廓线可分为3种类型,冬季型、夏季型、春秋季型.不同高度臭氧月平均浓度也明显不同.分析地面及上层臭氧浓度与气象因子如温度和湿度的相关关系,发现地面臭氧浓度与温度具有较好的线性关系,相关系数在0 .85以上.

Analysis on Concentration Variety Characteristics of Atmospheric Ozone Under the Boundary Layer in Beijing

Based on the atmospheric ozone sounding data, the average monthly and seasonal variety principles of atmospheric ozone concentration during six years are analyzed under the boundary layer in Beijing. The results show that the monthly variation of atmospheric ozone are obvious that the minimum values appear in January from less than 10×10^-9 on ground to less than 50×10^-9 on upper layer (2 km), but the maximum values appear in June from 85×10^-9 on ground to more than 90×10^-9 on upper layer. The seasonal variation is also clear that the least atmospheric ozone concentration is in winter and the most is in summer, but variety from ground to upper layer is largest in winter and least in summer. According to the type of outline, the outline of ozone concentration is composite of three types which are winter type, summer type and spring-autumn type. The monthly ozone concentration in different heights is quite different.After analyzing the relationship between ozone concentration and meteorological factors, such as temperature and humidity, we find ozone concentration on ground is linear with temperature and the correlation coefficient is more than 85 percent.