两类污染型下中低空风切变对PM<sub>2.5</sub>浓度影响

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摘要基于2015~2020年京津冀地区生态环境监测数据和多源气象数据,分析了北京地区0~3km中低空垂直风切变在不同PM_2.5等级下的演变特征。结果表明,风速日变化特征随着PM_2.5浓度升高而逐渐减弱,PM_2.56级污染时近地面风速日变化基本消失,甚至反向变化;白天边界层风速增大时段对应10m/(s·km)以下的风切变,20:00后增大至12~14m/(s·km),该现象随着PM_2.5污染加重变得更为显著,白天时段近地层垂直风切变较小值(<6m/(s·km))维持,可能是污染严重的信号之一;基于旋转经验正交函数分解法(REOF),将污染日下中低空垂直风切变分为无扰动型和压缩型,压缩型低压强度略强于无扰动型,无扰动型的PM_2.5浓度均值、峰值较压缩型更高,逆温强于压缩型,另外,无扰动型PM_2.5浓度增长期和边界层高度(PBLH)反向变化,压缩型PM_2.5浓度增长期和PBLH同向变化。

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	吴进
	李琛
	王志立
	马志强
	李梓铭
	朱晓婉
	韩婷婷
	唐宜西
	马小会

关键词 ：垂直风切变, PM_2.5, REOF, 边界层

Abstract：Based on the ecological environment monitoring data and multi-source meteorological data from 2015 to 2020 in Beijing-Tianjin-Hebei region, this study analyzed the evolution characteristics of 0~3km VWS at different PM_2.5 levels in Beijing. The diurnal variation characteristics of wind speed gradually weakened with the increase of PM_2.5 concentration. When PM_2.5 level 6pollution occured, the diurnal variation of near-surface wind speed basically disappeared or even changed in reverse direction. The VWS below 10m/(s·km) corresponded to the increase of boundary layer wind speed in the daytime which increased to 12~14m/(s·km) after 20:00. This phenomenon became more significant with the increase of PM_2.5, and the VWS near the stratum remains small (<6m/(s·km)) in the daytime could be one of the signs of serious pollution. Based on the rotated empirical orthogonal function (REOF) decomposition method, the VWS was divided into two types which called undisturbed type and compression type. The low pressure intensity of compression type was slightly better than undisturbed type; the PM_2.5 peak and daily value and inversion of undisturbed type were higher than compression type. In addition, the PM_2.5 growth of the undisturbed type and PBLH reverse change and the PM_2.5 growth of compressed type changed in the same direction as Planetary Boundary Layer Height (PBLH).

Key words： vertical wind shear(VWS) PM_2.5 REOF boundary layer

收稿日期: 2022-04-26

PACS:

X513

基金资助:中国气象科学研究院科技发展基金资助项目(2021KJ010);北京市气象局科技专项(BMBKJ202001011)

通讯作者: 王志立,研究员,wangzl@cma.gov.cn E-mail: wangzl@cma.gov.cn

作者简介: 吴进(1984-),女,福建莆田人,高级工程师,硕士,主要研究方向为区域大气污染。发表论文20篇。

引用本文:

吴进, 李琛, 王志立, 马志强, 李梓铭, 朱晓婉, 韩婷婷, 唐宜西, 马小会. 两类污染型下中低空风切变对PM_2.5浓度影响[J]. 中国环境科学, 2022, 42(11): 5016-5022. WU Jin, LI Chen, WANG Zhi-li, MA Zhi-qiang, LI Zi-ming, ZHU Xiao-wan, HAN Ting-ting, TANG Yi-xi, MA Xiao-hui. Effects of vertical wind shear on PM_2.5 concentration under two pollution weather types. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5016-5022.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I11/5016

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