北京大学学报自然科学版 ›› 2022, Vol. 58 ›› Issue (3): 412-420.DOI: 10.13209/j.0479-8023.2022.022

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基于激光雷达数据对混合层高度与细颗粒物浓度关系的研究

桑悦洋1,3, 初奕琦2, 刘喆1,4, 任静静1, 田晓青1, 王栖溪3, 李成才1,†   

  1. 1. 北京大学物理学院大气与海洋科学系, 北京 100871 2. 北京无线电测量研究所, 北京 100854 3. 31010 部队, 北京 100081 4. 94926 部队, 无锡 214000
  • 收稿日期:2021-03-26 修回日期:2021-05-12 出版日期:2022-05-20 发布日期:2022-05-20
  • 通讯作者: 李成才, E-mail: ccli(at)pku.edu.cn
  • 基金资助:
    国家重点研发计划(2016YFC0202004)和国家自然科学基金(42030607, 42075133)资助

Research on Relations between Atmospheric Mixing Layer Heights and Fine Particle Concentrations with Lidar Measurements

SANG Yueyang1.3, CHU Yiqi2, LIU Zhe1.4, REN Jingjing1, TIAN Xiaoqing1, WANG Qixi3, LI Chengcai1,†   

  1. 1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871 2. Beijing Institute of Radio Measurement, Beijing 100854 3. 31010 PLA Troop, Beijing 100081 4. 94926 PLA Troop, Wuxi 214000
  • Received:2021-03-26 Revised:2021-05-12 Online:2022-05-20 Published:2022-05-20
  • Contact: LI Chengcai, E-mail: ccli(at)pku.edu.cn

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摘要：

利用微脉冲激光雷达观测资料, 运用人工辅助算法, 获得2016―2019年白天混合层高度(MLH), 并分析其变化特征及其与空气污染物PM2.5浓度的关系。结果表明, 混合层高度表现出明显的季节变化和日变化, 春季高度明显大于其他季节, 最大值均发生在 5月。混合层高度在08:00―15:00 BJT的变化趋势与PM2.5浓度负相关。线性拟合结果表明, 当考虑风速的影响时, 通风指数与 PM2.5具有更强的负相关关系; 当考虑风向的影响时, 西南风情况下, 混合层高度与PM2.5具有更强的负相关关系。对天气分型后, 每个天气类型的PM2.5浓度与混合层高度的相关性更加显著。

关键词: 混合层高度(MLH), PM2.5, 通风指数, 线性拟合, 天气分型

Abstract:

Based on the observations of a micro-pulse lidar in Beijing, the MLH is retrieved by using the artificial assistance algorithm during the day from 2016 to 2019. Then the seasonal and diurnal variations of MLH and its relationship with PM2.5 mass concentration are analyzed. The results show that the MLH shows obvious seasonal and diurnal changes, and the daily averaged MLH is significantly higher in spring than that in other seasons. The daily maximum MLH height in every year occurs in May of the year. The variation trend of the MLH is opposite to the concentration of PM2.5 from 08:00 am to 03:00 pm. Through linear fitting of the data, it is shown that the negative correlation is stronger when the ventilation index and wind speed are induced. When considering the influence of wind direction, the MLH has a stronger negative correlation with PM2.5 in the case of southwesterly wind. In addition, after weather classification, the correlation between PM2.5 and the MLH in each same weather group can be significantly improved.

Key words: mixing layer height(MLH), PM2.5, ventilation index, linear fitting, weather classification

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