Process analysis of typical summertime ozone episodes over the Beijing area.
Process analysis of typical summertime ozone episodes over the Beijing area.
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DOI：
10.1016/j.scitotenv.2008.02.013
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
Jun Xu;Yuanhang Zhang;J. Fu;Shaoqing Zheng;Wei Wang
中科院分区：
文献类型：
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作者：
Jun Xu;Yuanhang Zhang;J. Fu;Shaoqing Zheng;Wei Wang
The 2008 Summer Olympic Games will be held in Beijing; however, summer is the season in which Beijing is marked by frequent high-O3episodes. Observation analysis reveals that the urban plume is transported by a southerly wind and undergoes chemical reaction during propagation, resulting in the common occurrence of high O3concentrations in the urban downwind area; this is the typical scenario of the formation of high summertime O3levels over the Beijing area. The typical high-O3episode is well reproduced by the 3-dimensional air-quality model CMAQ-MADRID (Community Multi-scale Air-Quality Model of Aerosol Dynamics, Reaction, Ionization, and Dissolution). Radical cycle analysis reveals that the Beijing urban area was in a VOC-limited regime for O3formation, while the urban downwind area changed gradually to a NOx-limited condition. The urban downwind area, Dingling, is readily affected by intrusion of the urban plume. Detailed process analysis indicated that although the O3peaks reached the same level on 26 and 27 June 2000, the dominant process contributing to the O3increase was different on each day. On 26 June, the major contributor to the O3peak at Dingling was the arrival of high O3levels with propagation of the urban plume; in contrast, on 27 June O3precursors were transported rapidly to the urban downwind area by strong transportation processes that occurred earlier than those on the previous day, resulting in O3production by local photochemistry becoming the major contributor to the high-O3episode.
