Ozone production in summer in the megacities of Tianjin and Shanghai, China: a comparative study
Ozone production in summer in the megacities of Tianjin and Shanghai, China: a comparative study
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DOI：
10.5194/acp-12-7531-2012
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发表时间：
2012-08
影响因子：
6.3
通讯作者：
L. Ran;Chunsheng Zhao;Wanyun Xu;M. Han;Xueqiang Lu;S. Han;Weili Lin;Xiaobin Xu;W. Gao
中科院分区：
文献类型：
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作者：
L. Ran;Chunsheng Zhao;Wanyun Xu;M. Han;Xueqiang Lu;S. Han;Weili Lin;Xiaobin Xu;W. Gao
中国经济的快速增长导致了许多地区臭氧前体物排放的显著增加，特别是在人口密集的华北平原和长江三角洲。提高对不同前体物排放引起的臭氧形成的认识，对于解决高度非线性的臭氧问题和为这些地区有效减少臭氧提供坚实的科学基础是必不可少的。对天津和上海两个特大城市夏季臭氧光化学产生进行了对比研究。在上海开展了常规的大气痕量气体监测的基础上，分别在天津市区和郊区开展了两次密集的现场监测，提供了地面臭氧及其前体物（包括氮氧化物（NOx）和各种非甲烷碳氢化合物（NMHCs））的数据集。无论是从高臭氧事件的频率还是持续时间来看，天津地区夏季的臭氧污染都比上海地区严重。这种差异可能是由于天津地区存在大量的高活性NMHCs。天津市区和郊区的工业相关物种如轻烯烃都占有重要地位，而上海则以芳烃为主。总体上，上海的臭氧问题是在城市范围内。严格管制本地排放物的政策，将有助减少出现高臭氧浓度的情况。相比之下，天津的臭氧污染可能是一个区域性问题。必须在区域范围内共同努力减少臭氧前体排放，以控制臭氧问题。
Rapid economic growth has given rise to a signif- icant increase in ozone precursor emissions in many regions of China, especially in the densely populated North China Plain (NCP) and Yangtze River Delta (YRD). Improved un- derstanding of ozone formation in response to different pre- cursor emissions is imperative to address the highly nonlin- ear ozone problem and to provide a solid scientific basis for efficient ozone abatement in these regions. A comparative study on ozone photochemical production in summer has thus been carried out in the megacities of Tianjin (NCP) and Shanghai (YRD). Two intensive field campaigns were carried out respectively at an urban and a suburban site of Tianjin, in addition to routine monitoring of trace gases in Shanghai, providing data sets of surface ozone and its precursors in- cluding nitrogen oxides (NOx) and various non-methane hy- drocarbons (NMHCs). Ozone pollution in summer was found to be more severe in the Tianjin region than in the Shang- hai region, based on either the frequency or the duration of high ozone events. Such differences might be attributed to the large amount of highly reactive NMHCs in Tianjin. Industry related species like light alkenes were of particular impor- tance in both urban and suburban Tianjin, while in Shang- hai aromatics dominated. In general, the ozone problem in Shanghai is on an urban scale. Stringent control policies on local emissions would help reduce the occurrence of high ozone concentrations. By contrast, ozone pollution in Tianjin is probably a regional problem. Combined efforts to reduce ozone precursor emissions on a regional scale must be under- taken to bring the ozone problem under control.