气候变化领域集成服务门户(CCPortal): Impact of near-surface turbulence on PM2.5 concentration in Chengdu during the COVID-19 pandemic

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DOI	10.1016/j.atmosenv.2021.118848
	Impact of near-surface turbulence on PM2.5 concentration in Chengdu during the COVID-19 pandemic
	Xia X.; Zhang K.; Yang R.; Zhang Y.; Xu D.; Bai K.; Guo J.
发表日期	2022
ISSN	1352-2310
卷号	268
英文摘要	The role of meteorological conditions has long been recognized in modulating regional air quality. The impact of near-surface turbulence, nevertheless, remains poorly understood. To curb the spread of COVID-19, a variety of lockdown measures were implemented, providing us an unprecedented opportunity to examine the joint impact of emission control and meteorology on regional air quality. Here we examined the variations of planetary boundary layer (PBL) height, PM2.5 concentrations, turbulence kinetic energy (TKE), vertical wind shear, and their associations in Chengdu, Sichuan province in Southwest China between January 13 and February 24, 2020, by synergistically using micro pulse lidar, ground-level meteorological and PM2.5 measurements, as well as ultrasonic anemometer observations. During the study period, Sichuan basin was primarily regulated by the straight west wind, with an averaged wind speed of 2–3 m/s at 850 hPa, indicative of a relatively stable atmospheric dispersion condition. TKE was positively correlated with PBL height but negatively correlated with PM2.5. The PM2.5 concentration varied dramatically during pre- and post-lockdown periods but remained near constant at a relatively low level during the lockdown period. Meanwhile, the negative correlation between TKE and PM2.5 was much stronger during the lockdown and post-lockdown periods, when aerosol emissions were significantly reduced. Moreover, the correlation between TKE and PM2.5 exhibited large diurnal variability, with the strongest correlation observed during the daytime when solar radiation and turbulent mixing generally reached their peaks. Overall, the observational results in Chengdu underscore the non-negligible impact of turbulence on regional PM2.5 concentrations, which could help better understand the variation of regional air pollution events. © 2021 Elsevier Ltd
关键词	COVID-19 PBL PM2.5 Sichuan Turbulence
语种	英语
scopus关键词	Air quality; Boundary layers; Emission control; Kinetic energy; Kinetics; Locks (fasteners); Turbulence; Wind; Chengdu; COVID-19; Near surfaces; Planetary boundary layers; PM 2.5; Pm2.5; Regional air quality; Sichuan; Surface turbulence; Turbulence kinetic energy; Atmospheric thermodynamics; aerosol; air quality; atmospheric pollution; concentration (composition); COVID-19; disease spread; particulate matter; spatiotemporal analysis; air pollution; air quality; air temperature; airflow; Article; atmospheric dispersion; atmospheric pressure; boundary layer; China; circadian rhythm; controlled study; coronavirus disease 2019; diffusivity; haze; human activities; lockdown; meteorology; pandemic; particulate matter 2.5; relative humidity; solar radiation; traffic pollution; turbulent flow; water vapor; wind speed; Chengdu; China; Sichuan; Sichuan Basin
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248134
作者单位	Chengdu Meteorological Bureau, Chengdu, China; Qionglai Meteorological Bureau, Chengdu, China; Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
推荐引用方式 GB/T 7714	Xia X.,Zhang K.,Yang R.,et al. Impact of near-surface turbulence on PM2.5 concentration in Chengdu during the COVID-19 pandemic[J],2022,268.
APA	Xia X..,Zhang K..,Yang R..,Zhang Y..,Xu D..,...&Guo J..(2022).Impact of near-surface turbulence on PM2.5 concentration in Chengdu during the COVID-19 pandemic.ATMOSPHERIC ENVIRONMENT,268.
MLA	Xia X.,et al."Impact of near-surface turbulence on PM2.5 concentration in Chengdu during the COVID-19 pandemic".ATMOSPHERIC ENVIRONMENT 268(2022).