Strong ozone production in urban plumes from Beijing, China
Strong ozone production in urban plumes from Beijing, China
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DOI：
10.1029/2006gl027689
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发表时间：
2006-11
影响因子：
5.2
通讯作者：
Tao Wang;A. Ding;Jian Gao;Wai-shing Wu
中科院分区：
文献类型：
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作者：
Tao Wang;A. Ding;Jian Gao;Wai-shing Wu
本文报道了2005年6 - 7月在北京北部山区获得的臭氧（O3）和相关痕量气体的最新测量结果。在39天的观察中，有13天的1小时O3混合比超过120 ppbv，最高水平为286 ppbv，这是中国公开文献中报告的最高值。对羽流特征和气团后向轨迹的分析表明，O3（和其他痕量气体）的最高浓度主要是由于北京城区的排放。O3与NOy密切相关，在检查的6次发作中，O3-NOy回归斜率为3-6 ppbv/ppbv。与北美的一些观测结果相反，北京烟羽中的O3-NOy正相关性扩展到NOy混合比高达55 ppbv，表明NOx在北京O3形成中的重要作用。在我们的研究中发现的O3浓度非常高，这意味着对植被和区域空气质量的显着的负面影响。
We report recent measurements of ozone (O3) and related trace gases obtained in June–July 2005 in a mountainous area north of Beijing. Of the 39 days of observation, there were 13 days whose 1‐hr O3 mixing ratio exceeded 120 ppbv, with a maximum level of 286 ppbv, which is the highest reported value in open literature for China. Analysis of plume characteristics and air‐mass back trajectories show the highest concentrations of O3 (and other trace gases) were mainly due to emissions from the Beijing urban area. O3 was strongly correlated with NOy with O3‐NOy regression slopes of 3–6 ppbv/ppbv in the six episodes examined. In contrast to some observations from North America, the positive O3‐NOy correlation in the Beijing plumes extended to NOy mixing ratios up to 55 ppbv, suggesting an important role of NOx in the formation of O3 in Beijing. The very high concentrations of O3 revealed in our study imply significant negative effects on vegetation and regional air quality.