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Pollution plumes observed by aircraft over North China during the IPAC-NC field campaign |
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| Authors: | JianZhong Ma Wei Wang HongJie Liu Yue Chen XiaoBin Xu Jos Lelieveld |
| Institution: | 1. Chinese Academy of Meteorological Sciences, Beijing, 100081, China 2. Chinese Research Academy of Environmental Sciences, Beijing, 100012, China 3. Max Planck Institute for Chemistry, 55128, Mainz, Germany 4. The Cyprus Institute, 1645, Nicosia, Cyprus |
| Abstract: | Strong pollution emissions from large urban and industrial centres in eastern China are thought to greatly impact regional air quality and global atmospheric chemistry. In this study, we investigate extensive pollution plumes over North China, observed by aircraft during the IPAC-NC (Influence of Pollution on Aerosols and Cloud Microphysics in North China) field campaign in spring 2006. Several pollution plumes were encountered, characterized by sharp and strong increases of SO2 and NO x (NO plus NO2) as well as remarkable O3 variability. During a flight performed downwind of the megacity Tianjin on 9 April, O3 was found to be depleted at NO x >15 ppbv and enhanced at NO x mixing ratios of 6–7 ppbv. Our analysis indicates that the plumes had recently been released by industrial plants, and partly mixed with urban emissions, giving rise to the large-scale transport of air pollution and substantial degradation of air quality. |
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