南京北郊春季地面臭氧与氮氧化物浓度特征

2009年3—5月,采用NO-NO2-NH3分析仪和O3分析仪对南京市北郊大气O3、NO、NO2和NOx浓度进行连续观测,研究南京北郊春季大气臭氧与氮氧化物浓度变化特征。结果表明:O3浓度的日变化呈单峰型结构,白天较高,夜晚较低,在06:00左右出现最低值,14:00左右出现峰值,且工作日的O3浓度值明显高于周末的O3浓度值。NOx的日变化呈现双峰型变化规律,早上07:00左右出现第1个峰值,下午14:00—15:00左右达到最低值,午夜23:00左右出现第2个峰值。从3—5月份,NO浓度明显下降,3月份的变化幅度比较大;NO2浓度则明显上升,5月份变化幅度较大。3—5月NO与O3之间呈显著的负相关关系,4—5月NO2、NOx与O3呈显著的负相关关系。

Concentration characteristics of surface ozone and nitrogen oxides in north suburb of Nanjing in spring

To investigate the variation characteristics of O3 and NOx concentration in spring in northern suburban of Nanjing,concentrations of O3,NO,NO2 and NOx in the atmospheric were measured continuously with NO-NO2-NH3 analyzer and O3 analyzer from March to May 2009.Results indicated that diurnal variation of O3 concentrations appeared the shape of single peak type,and O3 concentrations of daytime were higher than that of night.Peak O3 concentrations appeared at about 14:00,while the lowest O3 concentrations appeared at about 06:00.And O3 concentrations on weekdays were higher than that on weekends.Diurnal variation of NOx concentrations were double peak styles.Peaks of NOx concentrations appeared at about 07:00 and 23:00,meanwhile,the lowest concentrations appeared at about 14:00—15:00.From March to May,NO daily average concentrations decreased significantly and had bigger variety range in March,at the same time,NO2 daily average concentrations raised obviously and had bigger variety range in May.There was significant negative correlation between NO and O3 from March to May,and significant negative correlation was found between NO2,NOx and O3 from April to May.