| 基于大气成分观测网的山西省近地面O3体积分数分布特征 |
| 摘要点击 1451 全文点击 252 投稿时间：2023-03-01 修订日期：2023-05-11 |
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| 中文关键词 O3体积分数 前体物NOx 城市站 高山站 气团输送 |
| 英文关键词 O3 volume fraction precursor NOx urban station alpine station airmass transmission |
| 作者 | 单位 | E-mail | | 李莹 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | huangongly@163.com | | 王淑敏 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | | | 裴坤宁 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | | | 闫世明 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | qksysm@126.com | | 孙鸿娉 | 山西省人工增雨防雷技术中心, 太原 030006 | fengdichenshp@126.com | | 张逢生 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | | | 高兴艾 | 山西省气象科学研究所, 中国气象局温室气体及碳中和监测评估中心山西分中心, 太原 030006 | |
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| 中文摘要 |
| 利用山西省6个大气成分观测站2019年3月至2020年2月的反应性气体O3、NO、NO2和NOx连续观测资料以及同期气象资料，采用统计分析和后向轨迹分析等方法，对山西近地面O3体积分数变化特征及影响因素进行了对比研究.结果表明，6个站的O3体积分数一般在4~9月较高，10月至翌年3月较低，研究期内山西南部的晋城和临汾2站的O3日最大8h体积分数滑动平均值φ（MDA8O3）超标最严重，其次是北部的五台山、朔州和大同3站，中部的太原站O3污染较轻.对比城市站和高山站发现，两类站点的O3体积分数季节变化虽都表现为：夏季 > 春季 > 秋季 > 冬季，但前者主要受前体物NOx光化学反应的影响，后者的NOx并不是产生高体积分数O3的主要来源；两类站点的O3日变化谱型截然相反，城市站O3小时平均体积分数的峰谷值分别出现在15：00和06：00，而高山站分别出现在20：00和10：00，分别比城市站滞后了约5 h；此外城市站的O3日振幅明显大于高山站.就城市站而言，相较日照时数、降水量和总云量，气温对O3体积分数的影响更为显著；白天的NO2体积分数直接影响O3的日振幅大小，尽管太原站O3的光化学生成潜力也较高，由于被高体积分数的NO滴定消耗，O3体积分数为城市站中最低；各城市站高体积分数的O3对应低体积分数的NOx，低NOx以NO2为主，高NOx的贡献则主要来自NO，在较高NOx体积分数时，O3基本上完全被消耗.影响全部站点O3体积分数升高的地面风主要来自东南、南和西南方向，特定的风速条件将导致站点O3体积分数增加.站点地理位置不同会引起大气污染物输送作用的差异，而来自华北平原和汾渭平原高浓度O3的水平输送很可能是造成山西各站点O3体积分数升高的共同原因. |
| 英文摘要 |
| Based on the continuous data of O3， NO， NO2， and NOx and the meteorological data from March 2019 to February 2020 at six atmospheric composition observation stations in Shanxi Province， the characteristics and influence factors of O3 volume fractions were studied using statistical analysis and backward trajectory analysis. The results showed that O3 volume fractions were generally higher from April to September and lower from October to the following March. During the study period， O3 pollution represented by φ（MDA8O3）， i.e.， the maximum daily 8-h average of O3 volume fractions， was the most serious at the Jincheng and Linfen stations in the south of Shanxi， followed by that in the Wutaishan， Shuozhou， and Datong stations in the north， with the least pollution occurring at the Taiyuan station in the middle. There were differences between the urban and alpine stations， although their seasonal O3 volume fractions were both summer > spring > autumn > winter. O3 volume fractions at the urban station were usually lower than those at the alpine station； O3 at the urban station might have been influenced by photochemical reactions with precursor NOx； however， this was not the main source of high O3 at the alpine station. The peak and valley values appeared at 15：00 and 06：00， respectively， at the urban station， whereas they appeared at 20：00 and 10：00， respectively， at the alpine station， representing diametrically opposite diurnal variation patterns. Further， the daily amplitude of O3 at the urban station was much larger than that at the alpine station. For urban stations specifically， temperature was the most important meteorological factor affecting O3 volume fraction， compared with sunlight hours， precipitation， and total cloud cover. The NO2 volume fraction in the daytime affected the daily amplitude of O3； although the photochemical generation potential of O3 at the Taiyuan station was good， the O3 volume fractions were the lowest among urban stations due to strong NO titration. The higher O3 corresponded to lower NOx in which NO2 was dominant， and the higher NOx was largely composed of NO， under which conditions O3 would be depleted completely. The surface wind that affected O3 volume fractions of all stations primarily came from the southeast， south， and southwest， and specific wind speed led to the increase in O3 volume fraction. The geographical situation of the station would cause the difference in the transport of atmospheric pollutants， whereas the horizontal transmissions of high O3 from the North China Plain and Fenwei Plain were likely to be the common reason for the increase in O3 volume fraction in Shanxi. |
