| 上甸子本底站臭氧生成效率的观测研究 |
| 摘要点击 3217 全文点击 1280 投稿时间：2009-08-29 修订日期：2009-11-16 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 上甸子本底站 臭氧生成效率（OPE） NOx VOCs 相关性 |
| 英文关键词 Shangdianzi background station ozone production efficiency (OPE) NOx VOCs correlation |
|
| 中文摘要 |
| 2008年3月26日～10月9日在北京上甸子大气本底站开展了O3、NOx、NOy、CO等气体的现场观测和VOCs采样观测.利用观测数据，首次取得该本底站臭氧生成效率（OPE），研究了OPE与NOx和VOCs的关系，探讨了HNO3干沉降对OPE的可能影响及订正方法.结果表明，观测期间逐日OPE值的变化范围为0.2～21.1，平均值为4.9±3.6；晴天的总体OPE值为4.3±1.5；OPE值随NOx浓度的变化基本符合抛物线关系，当NOx<14×10-9时，OPE随NOx的增加而增加；当NOx>14×10-9时，OPE随NOx的增加而减少；芳香烃和OVOCs与OPE存在密切的正相关关系.HNO3等NOx氧化产物的干沉降对计算的OPE有显著影响，导致计算结果偏高.利用北京市区和上甸子的NOy/CO值可以对观测期间的OPE值进行初步订正，但订正方法尚不够严谨，结果需要进一步验证.未订正的OPE计算值可认为是实际OPE的上限. |
| 英文摘要 |
| Ambient O3, NOx, NOy, and CO were measured at the Shangdianzi regional background station from 26 March to 9 October 2008, and VOCs samples were taken and analyzed. This paper uses the data to obtain the ozone production efficiency (OPE) at Shangdianzi and studies the relationship of OPE with NOx and VOCs. In addition, the potential impact from the dry deposition of NOx oxidation products on the calculated OPE was estimated and tentatively corrected. Based on this study, the daily OPE varied in the range of 0.2-21.1, with an average of 4.9±3.6.An overall OPE average of 4.3±1.5 can be obtained. The dependence of OPE on the NOx concentration can be described using an empirical parabolic function. If the concentration of NOx is lower than 14×10-9, OPE increases with NOx; while if the concentration of NOx is higher than 14×10-9, OPE decreases with NOx. The correlation analysis indicates that the concentrations of aromatics and OVOCs are positively correlated to OPE. Dry deposition of HNO3 and other NOx oxidation products may significantly impact the calculated OPE values, leading to overestimate. It is possible to correct such overestimate using the NOy/CO ratios obtained at an urban site and at Shangdianzi. However, this correction is less rigorous and the corrected OPE data remain to be validated. The uncorrected data can be viewed as the upper limit of the real OPE. |
|
|
|
