特别选题
岳海燕,蒋媛,顾桃峰,王春林,吴昊.基于广州塔多层观测的城市臭氧污染垂直分布特征及成因分析[J].环境科学学报,2023,43(1):54-62
基于广州塔多层观测的城市臭氧污染垂直分布特征及成因分析
- Vertical distribution characteristics and its cause analysis of urban ozone pollution based on multi-layer observation on Guangzhou tower
- 基金项目：广东省科技计划项目（科技创新平台类）（No.2019B121201002）；广州市科技计划项目（No.202206010016）；大城市智慧观测与数据应用创新团队项目；广州市气象局科研项目（No.M202212）
- 作者
- 单位
- 岳海燕
- 广州市气象台，广州 511430
- 蒋媛
- 成都信息工程大学电子工程学院，成都 610225
- 顾桃峰
- 广州市突发事件预警信息发布中心，广州 511430
- 王春林
- 广州市气候与农业气象中心，广州 511430
- 吴昊
- 成都信息工程大学电子工程学院，成都 610225
- 摘要：利用2019年11月1日—2020年4月30日广州主城区和广州塔121 m、454 m O3浓度同步监测数据，分析了广州市O3垂直污染分布特征及成因.结果表明：①近地面O3浓度变化主要取决于人类活动如工业排放和机动车尾气排放等，而高空O3浓度主要取决于天气过程，如辐射造成光学反应加剧和区域传输.②地面的O3浓度高于垂直观测站点，其日变化均呈单峰型分布，表现为日出后太阳辐射增强O3浓度升高，在午后14：00—15：00达到一日中的最高值.③广州塔454 m的O3浓度日变化呈明显的双峰型特征，第1个峰值出现早上7：00后，O3浓度随着日出后边界层混合抬升而升高，第2个峰值持续出现在午后，因高温、辐射导致的光化学反应剧烈生成.相对广州其他站点的第2峰值滞后的现象，可能是由于近地面臭氧生成后垂直传输到塔顶出现的垂直混合的时间差，受到边界层抬升强度不同的影响.④广州塔121 m站点，O3浓度与风速的关系非常明显，广州南部地区臭氧贡献度达到了45%.在广州的冬季和春季，其中尤以冬季12—1月，广州臭氧污染贡献源广州塔中可能 来自于南部，广州塔顶454 m来自于东南部.
- Abstract：Using synchronous observation data of ozone in Guangzhou Tower and the main urban area of Guangzhou city from November 1， 2019 to April 30， 2020， vertical ozone pollution distribution in cities and its causes were analyzed in this paper. The main conclusions are： ①The variation of O3 concentration near ground mainly depends on human activities， such as industrial emissions and vehicle emissions， while the upper level O3 concentration mainly depends on weather processes， such as increased photochemical reaction due to radiation and regional transmission. ②The concentration of O3 on the ground is higher than that of the vertical observation station， and its daily variation is unimodal distribution， which increases after sunrise and reaches the highest value of the day from 14：00 to 15：00 in the afternoon. ③The diurnal variation of O3 concentration at 454 m of Guangzhou Tower shows obvious bimodal characteristics. The first peak appears after 7：00 a.m.， and the O3 concentration increases with the rising mixed boundary layer after sunrise. The second peak occurs in the afternoon， due to violent photochemical reaction caused by high temperature and radiation. The lag of the second peak value relative to other stations in Guangzhou may be due to the time difference of vertical mixing between near ground ozone generation and tower top， which is affected by different lifting intensity of the boundary layer. ④The relationship between O3 concentration and wind speed at the 121 meters of Guangzhou Tower is very obvious， and the contribution of ozone in the southern part of Guangzhou has reached 45%. In winter and spring in Guangzhou， especially from December to January in winter， the contribution source of ozone pollution at 121 meters of Guangzhou Tower may come from the south， while the ozone pollution at 454 meters of Guangzhou Tower may come from the southeast.
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