上甸子本底站地面臭氧变化特征及影响因素

利用TE Model 49C型臭氧监测仪,于2004年1月1日-12月31日,在上甸子本底站进行了地面φ(O₃)的连续在线监测.分析了全年φ(O₃)的变化特征及其与同期气象要素的相关关系,并对φ(O₃)高值日的个例分析进行了验证.结果表明,上甸子本底站地面φ(O₃)具有明显的季节变化和日变化规律,并且与同期的气象条件密切相关.主要特征:①夏初φ(O₃)较高,6月的平均值达到最高,小时平均最大值可达129.7 μL/m3;而冬季φ(O₃)较低,12月的平均值达到最低,小时平均最大值仅为32.7 μL/m3.②日变化趋势较为明显,在4:00-7:00出现最低值,在15:00-18:00出现最高值,变化幅度为夏季最大、冬季较小.③气温与φ(O₃)呈显著正相关,夏季相对湿度与φ(O₃)呈显著负相关,风向和辐射强度也与φ(O₃)及其变化规律呈显著相关关系. 

Surface Ozone Characteristics and the Correlated Factors at Shangdianzi Atmospheric Background Monitoring Station

TE Model 49C ozone(O₃) analyzer was used to continuously monitor surface ozone at Shangdianzi from Jan.1 to Dec.31,2004.The variation characteristics of surface ozone concentration and the relationship between O₃ concentration and meteorological elements were analyzed and,particularly,a high O₃ concentration day was identified and checked.The results show that surface ozone concentration at the background station has clear seasonal and diurnal change rules and has close relationship with local meteorological conditions.The main features include: ① O₃ concentration is high in early summer(the monthly average is maximum in June,with maximum hourly average of 129.7 μL/m3) and low in winter(the monthly average is minimum in Dec.,with maximum hourly average of 32.7 μL/m3);② Diurnal variation of surface O₃ concentration is also obvious,especially in summer.The minimum and maximum O₃ concentration appears in the morning during 4:00—7:00 and in the afternoon during 15:00—18:00 local time,respectively;③ Air temperature has significantly positive correlation with O₃ concentration.In summer,relative humidity has significantly negative correlation with O₃ concentration.Also,the wind direction and radiation correlates significantly with O₃ concentration and its variations.