主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2023, Vol. 39 ›› Issue (6): 28-36.doi: 10.3969/j.issn.1673-503X.2023.06.004

• 论文 • 上一篇    下一篇

2019年8月太原市一次典型O3和PM2.5污染天气过程成因分析

汪文雅1,2(),朱凌云1,2,*(),郭伟1,2,王雁1,2,陈玲1,2   

  1. 1. 山西省气象科学研究所, 山西太原 030002
    2. 中国气象局五台山云物理野外科学试验基地, 山西五台山 035515
  • 收稿日期:2022-03-25 出版日期:2023-12-28 发布日期:2024-01-27
  • 通讯作者: 朱凌云 E-mail:wenya04@163.com;zhlyun@126.com
  • 作者简介:汪文雅, 女, 1988年生, 高级工程师, 主要从事环境气象方面的研究, E-mail: wenya04@163.com
  • 基金资助:
    山西省面上自然科学基金项目(201901D111465);山西省气象局面上项目(SXKMSDW20226325);山西省基础研究计划项目(20210302124202);山西省气象局面上项目(SXKMSDW20226309)

Analysis of the causes of a typical O3 and PM2.5 pollution weather process in Taiyuan city in August 2019

Wenya WANG1,2(),Lingyun ZHU1,2,*(),Wei GUO1,2,Yan WANG1,2,Ling CHEN1,2   

  1. 1. Shanxi Institute of Meteorological Science, Taiyuan 030002, China
    2. Wutaishan Cloud Physics Field Experiment Base, China Meteorological Administration, Taiyuan 030002, China
  • Received:2022-03-25 Online:2023-12-28 Published:2024-01-27
  • Contact: Lingyun ZHU E-mail:wenya04@163.com;zhlyun@126.com

摘要:

选用太原市近地面O3、PM2.5、气象要素、天气形势、NCEP再分析资料、颗粒物激光雷达等资料, 结合后向轨迹模式, 对2019年8月19—20日太原市一次典型O3和PM2.5污染天气过程特征及成因进行分析。结果表明: 此次污染过程O3浓度早于PM2.5浓度达到峰值, 19日O3浓度较大且持续时间长, 20日PM2.5浓度增大, 但O3浓度明显减小。河套倒槽前小风、高温的稳定层结为19日O3和PM2.5的积累提供了有利条件, 边界层高度降低和偏东气流输送导致19日日落后O3和PM2.5浓度增大, 其后倒槽过境时的地面上升运动、边界层发展使近地面O3和PM2.5污染得到一定缓解, 20日冷锋过境后的边界层高度降低及高湿环境为PM2.5在近地层迅速积累提供了有利气象条件。在颗粒物污染占主导期间, 气温偏低以及PM2.5浓度突增造成近地层太阳辐射大幅减小是20日O3浓度偏低的主要原因; 19日高浓度O3污染主要受东南方向气流影响, 20日来自河南中南部的气流及来自内蒙古地区的沙团是PM2.5浓度上升的主要原因。

关键词: 边界层高度, 颗粒物污染, 后向轨迹

Abstract:

Using the near-surface O3, PM2.5, meteorological elements, weather patterns, NCEP reanalysis data, and particulate laser radar data in Taiyuan city, combined with a backward trajectory model, the characteristics and causes of a typical O3 and PM2.5 pollution weather process occurred from August 19 to 20, 2019, in Taiyuan city were analyzed.The results indicate that during this pollution event, the concentration of O3 peaks earlier than that of PM2.5.On the 19th, the concentration of O3 is high and lasts for a long time, whereas on the 20th, the concentration of PM2.5 increases, but that of O3 significantly decreases.The stable layer of low wind and high temperature before the Hetao trough provides favorable conditions for the accumulation of O3 and PM2.5 on the 19th.The decrease of boundary layer height and easterly air transport led to the increase of O3 and PM2.5 concentrations after sunset on the 19th.Subsequently, the upward movement of the ground and the development of the boundary layer during the transit of the trough reduce the O3 and PM2.5 pollution near the ground to a certain extent.After the transit of the cold front on the 20th, the reduced height of the boundary layer and the high humidity environment provide favorable meteorological conditions for the rapid accumulation of PM2.5 near the ground.During the period when particulate pollution was dominant, the main reason for the low O3 concentration on the 20th is the decrease of near-ground solar radiation caused by low temperature and sudden increase of PM2.5 concentration.On the 19th, the high concentration of O3 pollution is mainly affected by the airflow from the southeast direction, while on the 20th, the airflow from central and southern Henan and the sand mass from Inner Mongolia are the main reasons for the increase of PM2.5 concentration.

Key words: Boundary layer height, Particulate pollution, Backward trajectory

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