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Vertical distribution of water-soluble, sea salt, and dust aerosols in the planetary boundary layer estimated from two-wavelength backscatter and one-wavelength polarization lidar measurements in Guangzhou and Beijing, China

机译:根据广州和北京的两波长反向散射和一波长偏振激光雷达测量结果估算的行星边界层中水溶性,海盐和粉尘气溶胶的垂直分布

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摘要

Vertical and temporal distributions of water-soluble, sea salt, and dust aerosols in the planetary boundary layer (PBL) were analyzed from two-wavelength (532 and 1064 nm) backscatter and one-wavelength (532 nm) polarization lidar measurements taken at Guangzhou in July 2006 and Beijing in August 2006. We used an algorithm that estimates the extinction coefficients for each aerosol component from the three-channel lidar data. The results revealed water-soluble aerosols, most of which were anthropogenic aerosols, were dominant in both cities. Air pollution events occurred on 12 and 22-24 July in Guangzhou and on 3-11,16-19, and 23-25 August in Beijing. Differences in temporal variation of extinction coefficient of water-soluble particles (σ_(ws)) in the lower layers during the air pollution periods were distinct: σ_(ws) was higher in the nighttime at Beijing, whereas σ_(ws) was higher in the daytime in Guangzhou. Meanwhile similar vertical structures of σ_(ws) in the planetary boundary layer were found for both cities: σ_(ws) increased as the altitude increased. We suggest that different mechanisms contributed to the temporal and vertical variations of σ_(ws) in each city: hygroscopic growth mainly enhanced σ_(ws) in the nighttime and at high altitude for Beijing, while the transport of aerosols in the local area mainly enhanced σ_(ws) in the daytime and at high altitude in Guangzhou. Distinct differences were also observed in the sea-salt components in Guangzhou and in the dust components in Beijing. The correlation of the dust concentration and aerosol depolarization ratio implies that internal mixing of water-soluble and dust particles occurred in Beijing during the air pollution periods.
机译:利用广州地区的两波长(532和1064 nm)反向散射和一波长(532 nm)偏振激光雷达测量,分析了行星边界层(PBL)中水溶性,海盐和粉尘气溶胶的垂直和时间分布我们在2006年7月和2006年8月在北京进行了研究。我们使用了一种算法,可以根据三通道激光雷达数据估算每种气溶胶成分的消光系数。结果表明,水溶性气雾剂在两个城市中都占主导地位,其中大多数是人为气溶胶。空气污染事件分别在7月12日和22日至24日在广州,8月3-11日,16-19日和8月23-25日在北京发生。在空气污染期间,下层水溶性颗粒消光系数(σ_(ws))随时间的变化差异是明显的:北京夜间的σ_(ws)较高,而北京的σ_(ws)较高。广州的白天。同时,两个城市在行星边界层中都发现了类似的垂直结构σ_(ws):σ_(ws)随着高度的增加而增加。我们认为,每个城市中σ_(ws)的时空变化和垂直变化的机理不同:北京夜间和高海拔地区,吸湿性增长主要增强了σ_(ws),而局部地区的气溶胶运输主要增强了广州白天和高海拔的σ_(ws)。在广州的海盐成分和北京的粉尘成分中也观察到了明显的差异。尘埃浓度与气溶胶去极化率的相关性表明,在空气污染时期,北京发生了水溶性和尘埃颗粒的内部混合。

著录项

  • 来源
    《Atmospheric research》 |2010年第4期|P.602-611|共10页
  • 作者单位

    Atmospheric Environment Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-0052, Japan;

    Atmospheric Environment Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-0052, Japan;

    Atmospheric Environment Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-0052, Japan;

    Atmospheric Environment Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-0052, Japan;

    College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China;

    College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China;

    Guangdong Provincial Environmental Monitoring Center, Guangdong, 510045, China;

    Guangdong Provincial Environmental Monitoring Center, Guangdong, 510045, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aerosols; lidar; planetary boundary layer; relative humidity;

    机译:气雾剂激光雷达行星边界层相对湿度;
  • 入库时间 2022-08-18 03:36:08

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