涂爱琴, 王珍珠, 李恒昶, 施奇兵, 张海, 刘东, 翁宁泉. 利用激光雷达探测潍坊市夏季臭氧分布特征[J]. 红外与激光工程, 2023, 52(5): 20220579. DOI: 10.3788/IRLA20220579
引用本文: 涂爱琴, 王珍珠, 李恒昶, 施奇兵, 张海, 刘东, 翁宁泉. 利用激光雷达探测潍坊市夏季臭氧分布特征[J]. 红外与激光工程, 2023, 52(5): 20220579. DOI: 10.3788/IRLA20220579
Tu Aiqin, Wang Zhenzhu, Li Hengchang, Shi Qibing, Zhang Hai, Liu Dong, Weng Ningquan. Detection of ozone distribution characteristics in Weifang during summer using lidar[J]. Infrared and Laser Engineering, 2023, 52(5): 20220579. DOI: 10.3788/IRLA20220579
Citation: Tu Aiqin, Wang Zhenzhu, Li Hengchang, Shi Qibing, Zhang Hai, Liu Dong, Weng Ningquan. Detection of ozone distribution characteristics in Weifang during summer using lidar[J]. Infrared and Laser Engineering, 2023, 52(5): 20220579. DOI: 10.3788/IRLA20220579

利用激光雷达探测潍坊市夏季臭氧分布特征

Detection of ozone distribution characteristics in Weifang during summer using lidar

  • 摘要: 为了研究潍坊市夏季臭氧的分布特征,使用差分吸收激光雷达在潍坊市进行观测,分析了晴天和雨天臭氧分布的差别,并统计了无降水日臭氧的垂直分布和日变化特征。结果表明:降水发生前强烈的对流运动和大风会使对流臭氧层变厚,臭氧浓度变低;降水发生在一天中的不同时段,对臭氧污染的影响差异很大;无降水日对流臭氧层主要分布在1500 m以下,呈现白天高、夜晚低的日变化特征,高浓度值常出现在12~18时;在垂直结构上呈现分层的特征,其中,300~500 m高度的臭氧浓度随着高度的增加而增大,且在500 m附近达到极大值,该高度和米散射激光雷达探测的边界层高度基本一致;1500 m高度各个时段的臭氧浓度趋于一致,且自该高度往上臭氧无明显日变化特征,可将该层臭氧浓度作为臭氧预报的大气背景值。

     

    Abstract:
      Objective   Tropospheric ozone is an important greenhouse gas and a pollutant harmful to organisms. It not only affects the radiation balance of the ground-atmosphere system, but also seriously endangers the ecological environment. When the near-ground ozone concentration exceeds a certain threshold, it will cause a series of adverse effects on human health and the growth of animals and plants. Since the near-ground ozone concentration depends largely on the physical conditions of the upper layer atmosphere, it is of great significance to carry out vertical ozone detection and study the ozone distribution characteristics for the source analysis and pollution prevention of ozone. In recent years, the near-ground ozone concentration in Weifang has been increasing, especially in summer, which has replaced fine particles as the main pollutant. Therefore, the temporal and spatial distribution characteristics of ozone in Weifang during summer are analyzed in this paper.
      Methods  The differences of ozone distribution under two different weather conditions of fine day and rainy day are studied through analyzing typical cases in this paper. In addition, in order to study the differences in ozone distribution at different times of the day, the time of a day was divided into four periods, namely morning transition, daytime, evening transition and nighttime, and the vertical distribution characteristics of ozone at each period were statistically analyzed. The low-altitude ozone concentration data used for the analysis was detected by the GBQ L-04 ozone lidar (Fig.1) produced by Hefei Zhongke Guangbo Quantum Technology limited company. The monitoring period is from June 1, 2020 to August 31, 2020. The monitoring location is located in Weifang Environmental Monitoring Center Station (119.15°E, 36.70°N).
      Results and Discussions  The daily variation of low-altitude ozone concentration on sunny days is distinct, while on rainy days it varies with the time of the day when precipitation occurs. Ozone pollution will not be too strong when precipitation occurs in the evening because of good production conditions and weak diffusion conditions for ozone during the day due to cloud cover and atmospheric convective motion. Conversely, if precipitation occurs in the morning and the sky clears after rain, daytime ozone pollution is less influenced by precipitation. When meteorological conditions such as radiation, temperature and humidity are similar, strong winds will significantly reduce the ozone concentration. Before rainfall, strong convective movement and gale will make the convective ozone layer thicker and the ozone concentration lower (Fig.2). Many interfering bright blocks appear on the ozone distribution map detected by radar during precipitation. This indicates that the results of ozone concentration detected by ozone lidar during precipitation are not reliable. On non-precipitation days, the convective ozone layer is mainly distributed below 1500 m, showing the characteristics of diurnal variation of high in the day and low at night, and the high concentration value often appears at 12-18 o'clock (Fig.3). This may be closely related to the photochemical process of near-ground and the atmospheric vertical diffusion. The convective ozone layer on non-precipitation days can be divided into several layers from up to down (Fig.4). This may be related to the thermal vertical structure of the atmosphere.
      Conclusions  The distribution characteristics of ozone under typical weather conditions and the statistical characteristics of ozone on non-precipitation days in Weifang are analyzed with data detected by a differential absorption lidar in this paper. The research shows that meteorological conditions have a great impact on ozone distribution. On non-precipitation days, the convective ozone layer is mainly distributed below 1500 m. It increases with height between 300-500 m , and reaches a maximum near 500 m, which is basically consistent with the boundary layer height detected by the Mie-scattering lidar. The ozone concentration of each period of a day at 1500 m tends to be consistent, and there is no obvious diurnal variation up from this height. The ozone concentration in this layer can be used as the atmospheric background value in ozone forecast.

     

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