2013-2017年太原市臭氧浓度变化特征
Variation characteristics of ozone concentration in Taiyuan from 2013 to 2017
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摘要: 利用2013-2017年太原市近地面O3的连续观测资料以及气象数据，分析了太原市O3浓度的变化特征及其与气象要素的关系.结果表明，太原市2013-2017年O3浓度整体呈上升的趋势，特别是2017年，O3-8 h浓度超标天数达到66 d，O3污染形势严峻.O3浓度的月变化峰值出现在6月份，日变化特征呈现单峰型分布，5-7时浓度较低，15-16时出现峰值.除上兰背景点外，太原市不同监测点位O3浓度变化总体表现为城市周边点位高于城市中心.气象因素分析表明，O3与NO2、PM2.5及相对湿度呈负相关性，而与气温、风速呈正相关性.当风向为南风或西南方风时，O3浓度较高，说明太原市O3浓度升高可能与区域污染输送有关.Abstract: The characteristics of surface ozone concentration and its relationship with meteorology were analyzed by continuous observation from 2013 to 2017 in urban site of Taiyuan. The results showed that the annual averaged concentration of ozone was increasing from 2013 to 2017, the over polluted days of ozone were 66 d and the situation of ozone pollution in Taiyuan became worse. Ozone concentration reached its peak in June in a year, the diurnal distribution of ozone presented a clear unimodal with its peak appearing at 15:00 or 16:00 and trough at 05:00 or 07:00. For the spatial distribution of ozone, the concentration was lower in central sites than suburbs sites except for Shanglan site. The research showed that the ozone concentration was positively correlated with temperature and wind speed, while negatively correlated with NO2, PM2.5 and relative humidity. The higher ozone concentration was found under southwest and southern winds, which indicated that ozone may be related to regional pollution transport.
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Key words:
- ozone /
- variation characteristics /
- photochemical reaction /
- Taiyuan /
- meteorological factor
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