气候变化领域集成服务门户(CCPortal): Physical and chemical mechanisms of the daily-to-seasonal variation of PM10 in Korea

CCPortal

DOI	10.1016/j.scitotenv.2019.136429
	Physical and chemical mechanisms of the daily-to-seasonal variation of PM10 in Korea
	Kim S.-U.; Kim K.-Y.
发表日期	2020
ISSN	489697
卷号	712
英文摘要	In this study, the CSEOF technique is used to investigate the physical and chemical mechanisms associated with the weekly PM10 variation in South Korea. For this end, 9 years of hourly measurements of PM10 in South Korea is used together with other gaseous contaminants (NO2, SO2, CO and O3) and traffic counts at the toll gates. The diurnal variation of PM10 concentrations indicates a significant correlation with human activities; higher concentrations in densely populated areas with a large volume of traffics and vice versa. In particular, the diurnal cycles of PM10, NO2 and CO show bimodal structures with maxima corresponding to the morning and evening rush hours. While NO2 and CO maxima are observed at ~9 AM, with some delay from the traffic maximum, PM10 peak is observed ~11 AM, indicating roughly 2 h of conversion process from gaseous pollutants to particulate matter. After the sunset, gas-to-particle conversion efficiency is significantly reduced and PM10 concentration begins to increase slowly. SO2 exhibits a slightly different feature, showing diurnal variation with a single peak at 11 AM and relatively minor contribution to the diurnal variation of PM10. O3 participates in the photochemical reactions of the gaseous pollutants, providing OH radical as an oxidant. Physical factors (e.g. boundary layer height, 10 m wind gust, wind convergence) affecting horizontal and vertical mixing of polluted air are responsible for dispersion of accumulated PM10 in the afternoon. As a result, strong morning-evening asymmetry is seen in the diurnal variation of PM10 concentrations. Also, notable seasonal dependency is observed in the concentrations of PM10 and the gaseous contaminants due to the seasonal variation of emission and the physical factors. © 2020 The Authors
scopus关键词	Boundary layer flow; Boundary layers; Fog; Free radical reactions; Free radicals; Nitrogen oxides; Pollution; Bi-modal structures; Boundary layer heights; Conversion process; Gaseous contaminants; Gaseous pollutants; Particulate Matter; PM10 concentration; Seasonal variation; Photochemical reactions; carbon monoxide; nitrogen dioxide; ozone; sulfur dioxide; atmospheric pollution; concentration (composition); human activity; ozone; particulate matter; photochemistry; physicochemical property; seasonal variation; Article; bioaccumulation; biomass; circadian rhythm; concentration (parameter); controlled study; dispersion; particulate matter; periodicity; physical chemistry; priority journal; seasonal variation; South Korea; time series analysis; South Korea
来源期刊	Science of the Total Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176932
作者单位	School of Earth and Environmental Sciences, Seoul National University, Seoul, 08826, South Korea
推荐引用方式 GB/T 7714	Kim S.-U.,Kim K.-Y.. Physical and chemical mechanisms of the daily-to-seasonal variation of PM10 in Korea[J],2020,712.
APA	Kim S.-U.,&Kim K.-Y..(2020).Physical and chemical mechanisms of the daily-to-seasonal variation of PM10 in Korea.Science of the Total Environment,712.
MLA	Kim S.-U.,et al."Physical and chemical mechanisms of the daily-to-seasonal variation of PM10 in Korea".Science of the Total Environment 712(2020).