南京北郊大气臭氧浓度变化特征

以南京北郊大气中O3质量浓度观测资料为基础,分析了O3变化特征和气象要素对其影响程度。结果表明：大气O3日均质量浓度平均为65.8μg·m-3。O3质量浓度最大值出现在午后15时左右,O3质量浓度日最大值在春季最大,而冬季最小。白天工作日O3质量浓度要高于周末,而夜间两者差异不大。气温,日照时数和降水量是影响南京大气O3质量浓度的重要因素。全年中5月份高日照时数和较低的降水量导致南京出现O3高值。在偏南气流作用下,O3质量浓度偏高。由气象要素得到的O3日均质量浓度和O3日最高质量浓度回归方程相关系数分别为0.61和0.71。

Observational study of ozone concentrations in northern suburb of Nanjing

Based on the observational data of near surface ozone and meteorological factor in northern suburb of Nanjing, the variation characteristics of ozone and relationship with meteorological factor were analyzed. The results showed that daily average ozone concentrations were 65.8 μg·m3. Peak ozone concentrations in Nanjing often appear about 15：00 in the early afternoon. Daily maximum and minimum values were observed spring and winter, respectively. Ozone formation presented the phenomenon of ＂weekend effect＂. Ozone concentrations in daytime in weekdays were a little higher than weekends, but little difference in night. Temperature, sunshine duration and precipitation had significant effect on ozone. The high ozone levels in May perhaps due to the long sunshine duration and little rainfall during this period. The distant transport associated with southern winds contributed substantially to the ozone levels. Regression equations of daily average ozone（r=0.61） and daily maximum ozone（r=0.71） concentrations showed significant correlation with meteorological factor, respectively.