Ozone production and hydrocarbon reactivity in Hong Kong, Southern China
Ozone production and hydrocarbon reactivity in Hong Kong, Southern China
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DOI：
10.5194/acp-7-557-2007
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发表时间：
2006-09
影响因子：
6.3
通讯作者：
J. Zhang;Tao Wang;W. Chameides;C. Cardelino;J. Kwok;D. Blake;A. Ding;K. So
中科院分区：
文献类型：
--
作者：
J. Zhang;Tao Wang;W. Chameides;C. Cardelino;J. Kwok;D. Blake;A. Ding;K. So
对2002年秋季香港和珠江三角洲(珠江三角洲)空气监测试验研究期间在香港获得的数据进行分析，以揭示地面臭氧(O 3)、污染前兆和跨境运输之间的关系。其中有9宗个案的每小时臭氧浓度超过100ppbv，1宗个案的臭氧浓度超过90ppbv，其中1宗个案的每小时臭氧浓度达203ppbv，是香港有记录以来的最高纪录。结合高分辨率的反轨迹，DCO/DNOy(本底以上CO浓度增加与NOy浓度增加之比)被用来确定臭氧是局部还是局部产生的。在所研究的十个香港O 3-事件中，有五个显示出来自广东省的“污染特征”。对形态挥发性有机化合物(VOCs)的研究表明，VOCs的反应活性主要是人为VOCs，其中反应性芳香族化合物占主导地位，特别是二甲苯和甲苯。光化学箱模式的计算表明，如果亚硝酸(HONO)的存在浓度达到研究得出的浓度，那么在O 3事件期间，香港观察到的臭氧增加的50%-100%可以用香港地区内的光化学产生来解释。基于观测的模型(OBM)被用来计算臭氧产生对前体化合物浓度变化的敏感性。一般来说，在香港大部分地区，臭氧的产生受到挥发性有机化合物的限制，而高浓度的一氧化氮(NO)则会抑制臭氧的浓度。
Data obtained in Hong Kong during the Hong Kong and the Pearl River Delta (PRD) Pilot Air Monitoring Study in autumn 2002 are analyzed to unravel the relationship between ground-level ozone (O 3 ), pollution precursors, and cross-border transport. Ten ozone episodes, during which the hourly O 3 concentration exceeded 100 ppbv in 9 cases and 90 ppbv in one case, are subject to detailed analysis, including one case with hourly O 3 of 203 ppbv, which is the highest concentration on record to date in Hong Kong. Combined with high-resolution back trajectories, dCO/dNO y (the ratio of enhancement of CO concentration above background to that of NO y ) is used to define whether O 3 is locally or regionally produced. Five out of the ten Hong Kong O 3 -episodes studied show a "pollution signature" that is indicative of impact from Guangdong Province. Examination of speciated volatile organic compounds (VOCs) shows that the reactivity of VOCs is dominated by anthropogenic VOCs, of which the reactive aromatics dominate, in particular xylenes and toluene. Calculations using a photochemical box model indicate that between 50–100% of the O 3 increase observed in Hong Kong during the O 3 episodes can be explained by photochemical generation within the Hong Kong area, provided that nitrous acid (HONO) is present at the concentrations derived from this study. An Observation-Based Model (OBM) is used to calculate the sensitivity of the O 3 production to changes in the concentrations of the precursor compounds. Generally the production of O 3 throughout much of the Hong Kong area is limited by VOCs, while high nitric oxide (NO) concentrations suppress O 3 concentration.