中文摘要：

利用腔衰减相移式NO2光谱仪（CAPS）和传统化学荧光法（CL）同时测量北京2012年8月21—29日大气NO2浓度变化.对比两种仪器的NO2浓度,两种仪器结果在白天光化学反应较强期间偏差较大,最高可达25%.结合O3以及NOy观测计算了臭氧生成效率（OPEx）,结果显示CAPS仪器结果计算得出的OPEx比CL小40%.对比低浓度和高浓度O3时期,前者差异小于后者,说明准确的NO2浓度测量对OPEx的计算至关重要,在O3污染期间尤为重要,是影响臭氧敏感性控制指标的一个显著因素.

英文摘要：

Compared to the commercially standard chemiluminescence-based（ CL） NOxanalyzers,which often have high uncertainty due to the interference of reactive nitrogen species,the Cavity attenuated phase shift spectroscopy（ CAPS） monitor shows much enhanced performance in detecting the ambient gaseous nitrogen dioxide（ NO2）. In this study,both instruments were deployed in Beijing during 21—29 August 2012. The NO2 measured by CAPS shows overall agreement with that by CL,yet large difference up to 25% was also observed in the afternoon. As a result,the calculated ozone production efficiency of NOx（ OPEx） derived from the correlations of Ox-NOzwith the CL NO2 can be overestimation by 40% in Beijing. This overestimation could be significant in high O3 polluted period and implicate the important impact on the O3 sensitivity indicator.