| 引用本文: | 刘 松，程 燕，李博伟，王叶琳，肖 波，严 璐，刘舒婷.2017.2013 — 2016年西安市臭氧时空变化特性与影响因素[J].地球环境学报,8(6):541-551 |
| LIU Song, CHENG Yan, LI Bowei, WANG Yelin, XIAO Bo, YAN Lu, LIU Shuting.2017.Characteristics of temporal and spatial variations of ozone and it’s influencing factor over Xi’an during 2013 — 2016[J].Journal of Earth Environment,8(6):541-551 |
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| 摘要: |
| 臭氧污染主要是由前体物氮氧化物（NOx）和挥发性有机物（VOC）的过量排放引起的，通过NOx/ SO2的比值可得知西安地区已经受到了光化学烟雾型污染的影响，大气中臭氧含量与NOx的含量相关性较高；西安13个站点的8小时平均浓度分布变化大体可分为单峰变化和持续递减类型，浓度主要集中在0 — 90 μg ∙ m−3，不同站点臭氧含量相差较大；2013 — 2016年，高新西区臭氧超标天数最多，为146天，是超标天数最少的兴庆小区的2倍多。高浓度臭氧主要出现在高温度、低湿度、实时风向为东南风或南风的天气。此外，治理臭氧污染必须限制机动车尾气排放，同时研究表明来自秦岭的植物VOC对于西安臭氧浓度影响很大。 |
| 关键词: 臭氧 光化学污染 空间与时间变化 前体物 |
| DOI：10.7515/JEE201706006 |
| CSTR：32259.14.JEE201706006 |
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| Characteristics of temporal and spatial variations of ozone and it’s influencing factor over Xi’an during 2013 — 2016 |
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LIU Song, CHENG Yan, LI Bowei, WANG Yelin, XIAO Bo, YAN Lu, LIU Shuting
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School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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| Abstract: |
| Background, aim, and scope Ozone has attracted extensive attention due to its important roles in air quality and ecosystem, which can be regarded as a beneficial ultraviolet shield in the stratosphere but a harmful matter to human being at the ground level. Ozone pollution is mainly caused by excessive emission of precursor gases such as NOx and volatile organic compound (VOC). NOx / SO2 ratio in atmosphere of Xi’an indicates that photochemical smog pollution has become one of the most important air quality problems in this city. The goals of this study are (1) to investigate the variation of ozone concentration; (2) to identify the influencing factors associating with ozone concentration in atmosphere of Xi’an. This work is very important to the research of the photochemical pollution in Xi’an and western China, especially the ozone pollution. Materials and methods Surface ozone concentrations in Xi’an were monitored using the ozone analyzer at 13 monitoring stations, from January 1, 2013 to December 31, 2016. We discussed the daily, seasonal and annual variation of ozone, and the spatial distribution. Results The ozone eight-hour concentrations on different stations ranged from 0 to 90 μg ∙ m−3, and the variation of which can be divided into unimodal and declining types. The former has the peak in the range from 30 μg ∙ m−3 to 60 μg ∙ m−3, and the latter in the range from 0 to 30 μg ∙ m−3. Discussion By analyzing annual variations of motor vehicle, it was found that the concentrations of ozone has a high correlation with NOx<.sub>. We analyzed the temporal variations of ozone and the correlations between ozone concentrations with meteorological factors in Xi’an. Conclusions The result showed that the change of ozone has obvious daily and seasonal variation, and the concentration is on the rise. What’s more, high concentrations of ozone are found mainly in such days with high temperature, low humidity, and southeastly/southly wind, and the biogenic VOC from the Qinling Mountains has a huge impact on the concentration of ozone in Xi’an. Recommendations and perspectives Our results indicate that the variation of ozone concentration is greatly influenced by meteorological factors. In addition, preventing ozone pollution must reduce vehicle emissions. |
| Key words: ozone photochemical pollution temporal and spatial variations precursor gases |
