新冠疫情防控期京津冀重污染气象成因分析

刘艳杰; 刘小雪; 马庚雪

doi:10.12153/j.issn.1674-991X.20210037

新冠疫情防控期京津冀重污染气象成因分析

doi: 10.12153/j.issn.1674-991X.20210037

1.
廊坊市气象局
2.
天津北辰区气象局

详细信息

作者简介:
刘艳杰(1986—),女,工程师,主要研究方向为天气预报及预警, lyj0920qzh@126.com

中图分类号: X51
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-08
- 刊出日期: 2021-11-20

Analysis on meteorological causes of heavy pollution in Beijing-Tianjin-Hebei Region during the prevention and control of COVID-19

1.
Langfang Meteorological Bureau
2.
Beichen Meteorological Bureau of Tianjin

摘要

摘要: 针对2020年2月8—13日新冠疫情防控期间京津冀地区一次持续的区域性重污染天气过程,利用地面、高空气象观测资料和欧洲中心ERA5数据,从环流背景、温度平流变化、地面气象要素和边界层风场分布等方面,分析了本次重污染天气过程的气象成因。结果表明:1)本次过程大气环流稳定,污染前期高空以西北气流为主,10日开始陆续有短波槽东移,850 hPa及以下转为偏南风,地面多次出现闭合低压,气压场整体较弱,天气形势静稳。2)中部地区冷空气活动不显著,大部分时段中低层为暖平流或弱冷平流。逆温出现次数明显偏多,且逆温层厚度和强度均大于南部,污染物不易扩散。3)中部地区地面风力较小,且边界层1 000 m以下风向较不稳定,通风性能差,加之南部污染物输送,导致该地区及周边重污染加强。4)重污染区域与地面辐合线分布相一致,出现在地面辐合线和湿区的北侧。5)对比2014年2月京津冀重污染天气过程,本次过程气象要素更加不利于污染物扩散,但防控减排在一定程度上减弱了污染程度。
- 新冠疫情 /
- 京津冀 /
- 重污染天气 /
- 气象成因
Abstract: A continuous regional heavy pollution process occurred in Beijing, Tianjin and Hebei from February 8 to 13, 2020, during the period of COVID-19 prevention and control. Based on the surface and upper air meteorological observation data and ERA5 data of European center, the meteorological causes of the heavy pollution event were analyzed from the circulation background, temperature advection, surface meteorological elements and boundary layer wind field distribution. The results showed: (1) During this process, the atmospheric circulation was stable. In the early stage of pollution, the upper air was dominated by northwest airflow. From February 10, the shortwave trough moved eastward one after another. South wind occurred at 850 hPa and below. There were many closed low pressure on the ground, the pressure field was weak in the whole, and the weather situation was stable. (2) The cold air activity in the central region was not significant, and the warm advection or weak cold advection occurred in the middle and low levels in most periods. The inversion times were obviously more, and the inversion layer thickness and strength were greater than the south. The pollutants were not easy to diffuse. (3) The ground wind in the central area was relatively small, and the wind direction below 1 000 m of the boundary layer was unstable, and the ventilation performance was poor. In addition, the transportation of pollutants in the south led to the strengthening of heavy pollution in this area and its surrounding areas. (4) The distribution of heavy pollution area was consistent with that of surface convergence line, which appeared in the north of surface convergence line and wet area. (5) Compared with the heavy pollution weather in Beijing, Tianjin and Hebei in February, 2014, the meteorological elements in this process were more unfavorable to the diffusion of pollutants, but the prevention and control of emission reduction had weakened the degree of pollution to a certain extent.
- COVID-19 /
- Beijing-Tianjin-Hebei Region /
- heavy pollution weather /
- meteorological causes

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