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  

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

作　　者：桑悦洋 初奕琦 刘喆[1,4] 任静静 田晓青 王栖溪 李成才 SANG Yueyang;CHU Yiqi;LIU Zhe;REN Jingjing;TIAN Xiaoqing;WANG Qixi;LI Chengcai(Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871;Beijing Institute of Radio Measurement,Beijing 100854;31010 PLA Troop,Beijing 100081;94926 PLA Troop,Wuxi 214000)

机构地区：[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

出　　处：《北京大学学报（自然科学版）》2022年第3期412-420,共9页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家重点研发计划(2016YFC0202004);国家自然科学基金(42030607,42075133)资助。

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PM_(2.5)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PM_(2.5)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PM_(2.5)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PM_(2.5)具有更强的负相关关系。对天气分型后,每个天气类型的PM_(2.5)浓度与混合层高度的相关性更加显著。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 PM_(2.5) 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 PM_(2.5) 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 PM_(2.5) in the case of southwesterly wind.In addition,after weather classification,the correlation between PM_(2.5) and the MLH in each same weather group can be significantly improved.

关 键 词：混合层高度(MLH) PM_(2.5) 通风指数 线性拟合 天气分型 

分 类 号：X513[环境科学与工程—环境工程] P412.2[天文地球—大气科学及气象学]