气候变化领域集成服务门户(CCPortal): Roles of meteorological factors in inter-regional variations of fine and coarse PM concentrations over the Republic of Korea

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DOI	10.1016/j.atmosenv.2021.118706
	Roles of meteorological factors in inter-regional variations of fine and coarse PM concentrations over the Republic of Korea
	Lee G.; Lee Y.G.; Jeong E.; Ho C.-H.
发表日期	2021
ISSN	1352-2310
卷号	264
英文摘要	This study examined meteorological effects on airborne concentrations of particulate matter (PM) of <2.5 μm (PM2.5) and 2.5–10 μm (PM2.5–10) diameter in 16 regions of Korea, including seven metropolitan cities and nine provinces. Regional distributions of mean PM concentrations indicate that PM2.5 concentrations were higher in provinces than in metropolitan cities, while PM2.5–10 concentrations were higher in the western than eastern regions, in the season with the highest concentrations during 2015–2019. Concentrations of PM of diameter <10 μm (PM10), the sum of fine and coarse PMs, decreased over all regions during 2001–2019, particularly in Seoul, the capital of Korea. Mechanisms by which meteorological factors such as air temperature, wind, humidity, and air pressure control PM concentrations in Korea vary with region, season, and PM size. Regardless of emissions, >25% of PM2.5 variability can be explained by Random Forest regression with only atmospheric variables, compared to little accountability for PM2.5–10. The two most important variables that affect PM2.5 variability are surface air temperature and wind. Transboundary transport controlled by atmospheric factors causes fine PM from northeast and east China to affect PM2.5 variations a day after emissions in the northern-central and southern regions of Korea, respectively; and coarse PM from east China affects PM2.5–10 variations in Korea on the same day. The present results suggest that local governments of regions with high PM concentrations should strengthen regulation policies with a long-term perspective, considering future changes in atmospheric conditions that may cause increases in PM levels. © 2021 Elsevier Ltd
关键词	Korea Meteorological variable PM10 PM2.5 PM2.5–10
语种	英语
scopus关键词	Atmospheric movements; Atmospheric temperature; Humidity control; Coarse particulate matter; Fine particulate matter; Korea; Meteorological factors; Meteorological variables; Particulate Matter; Particulate matter 10; Particulate matter2.5; Particulate matter2.5–10; Decision trees; accountability; air temperature; atmospheric pressure; local government; long-term change; particulate matter; regression analysis; air pressure; air temperature; article; China; city; government; humidity; particulate matter 10; particulate matter 2.5; random forest; season; South Korea; South Korea
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/248226
作者单位	Department of Atmospheric Sciences, Chungnam National University, Daejeon, South Korea; Climate and Air Quality Research Department, National Institute of Environmental Research, Incheon, South Korea; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
推荐引用方式 GB/T 7714	Lee G.,Lee Y.G.,Jeong E.,et al. Roles of meteorological factors in inter-regional variations of fine and coarse PM concentrations over the Republic of Korea[J],2021,264.
APA	Lee G.,Lee Y.G.,Jeong E.,&Ho C.-H..(2021).Roles of meteorological factors in inter-regional variations of fine and coarse PM concentrations over the Republic of Korea.ATMOSPHERIC ENVIRONMENT,264.
MLA	Lee G.,et al."Roles of meteorological factors in inter-regional variations of fine and coarse PM concentrations over the Republic of Korea".ATMOSPHERIC ENVIRONMENT 264(2021).