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Meteorology and topographic influences on nocturnal ozone increase during the summertime over Shaoguan, China

机译：中国韶关夏季夜间臭氧增加的气象及地形影响

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摘要

Ozone (O3) is a typical photochemical product, generally with a maximum value in the late afternoon and a minimum value at night. This study aimed to investigate the variation characteristics of nocturnal O3 in a subtropical urban city (Shaoguan, Guangdong Province, China). The measurement campaigns were conducted from 23 July to July 28, 2020. O3 lidar, aerosol lidar, and wind profile lidar were utilised to detect the vertical distributions of the O3 concentrations, aerosol extinction coefficient, and wind velocity. The topographic features, pollutant data (PM10, PM2.5, O3, SO2, NO2, and CO), and meteorological parameters (temperature, humidity, wind speed, and wind direction) were also analysed. The results showed that the concentration of nocturnal O3 over Shaoguan peaked at midnight. The horizontal wind was dominated by southwest and south winds, and the vertical wind was dominated by downdrafts during the fixed-point observations in Shaoguan. Horizontal transport might have a high impact on the increase in the nocturnal O3 because of high pollutant emissions in upwind cities. This was further justified by the 24-h back trajectories of the air mass generated by the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. Vertical transport of O3 in the lower or middle troposphere might be induced by the subtropical high and nocturnal mountain-valley breezes. Thus, the vertical mixing of O3 affects the O3 concentration at night.
机译：臭氧（O3）是一种典型的光化学产品，通常在下午晚期最大值和最小值。本研究旨在调查亚热带城市夜间O3的变异特性（中国广东省韶关）。测量运动是从7月23日至7月23日进行的，利用o3·雷达，气溶胶激光雷达和风剖面延长脉，检测O3浓度，气溶胶消光系数和风速的垂直分布。还分析了地形特征，污染物数据（PM10，PM2.5，O3，SO2，NO2和CO）以及气象参数（温度，湿度，风速和风向）。结果表明，在午夜达到韶关夜间O3的浓度。水平风由西南和南风主导，垂直风在韶关的定点观察期间由下滑。由于挤压城市的高污染物排放，水平运输可能对夜间O3的增加产生高影响力。这是由混合单粒子拉格朗日集成轨迹（HYSPLIT）模型产生的空气质量的24-H后轨迹的进一步证明。亚热带高高和夜间山谷山谷的垂直转运o3在较低或中间对流层中的垂直传输。因此，O3的垂直混合在夜间影响O3浓度。

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  • 来源
    《Atmospheric environment》 |2021年第7期|118459.1-118459.11|共11页
  • 作者

    He Yuanping; Wang Haolin; Wang Haichao; Xu Xinqi; Li Yuman; Fan Shaojia;

  • 作者单位

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai 519082 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Minist Educ Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai 519082 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    O3; O3 lidar; Wind profile; Horizontal transport; Mountain-valley breezes;

    机译：O3;O3 LIDAR;风剖面;横向运输;山谷布雷兹;

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