气候变化领域集成服务门户(CCPortal): Optical and chemical properties of long-range transported aerosols using satellite and ground-based observations over seoul, South Korea

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DOI	10.1016/j.atmosenv.2020.118024
	Optical and chemical properties of long-range transported aerosols using satellite and ground-based observations over seoul, South Korea
	Choo G.-H.; Lee K.; Seo J.; Kim S.-Y.; Lee D.-W.; Shin H.-J.
发表日期	2021
ISSN	1352-2310
卷号	246
英文摘要	Aerosols that are transported long distances to the Korean Peninsula due to seasonal weather conditions can affect the local air quality of South Korea. In general, the long-range transported aerosols are widely distributed and variable with respect to time and space. In this aspect, geostationary satellites can be used as a powerful tool for providing temporal and spatial variation of aerosols by sequentially observing a target area. In this study, select events of high-concentration aerosols transported to Seoul, the capital of South Korea, were identified and analyzed using aerosol optical properties retrieved from geostationary ocean color imager (GOCI) for the cold season (October–March) from 2015 to 2018. In addition to the satellite data, ground-based observations of particulate matter (PM) and backward trajectory models were used. Based on the trajectories of air masses simulated with the backward trajectory models, events of the long-range transported high-concentration aerosols (hereafter referred to as “LRT events”) were selected and classified into three types: yellow dust, PM traversing over the Yellow Sea (PM-YS), and PM passing through North Korea (PM-NK). Optical and chemical properties of the three LRT events were analyzed, and significantly different features were found. Yellow dust showed a relatively high mean depolarization ratio at 1020 nm (0.26), a low Ångström exponent between 440 nm and 870 nm (0.27), fine mode fraction at 500 nm (0.26), single scattering albedo at 440 nm (0.93), and lidar ratio at 675 nm (37 sr) compared with those during the other PM events. Moreover, the proportions of Ca+ concentrations to the water-soluble ions in PM2.5 and concentrations of Ca and Fe among inorganic elements in PM2.5 significantly increased during the yellow dust event. On the contrary, the PM events (PM-YS and PM-NK) had relatively high mean Ångström exponent (1.28 and 1.38), fine mode fraction (0.94 and 0.81), single scattering albedo (0.96 and 0.94), lidar ratio (66 sr and 44 sr), and low depolarization ratios (0.035 and 0.066). The ratios of NO3− and SO42− to water-soluble ions in PM2.5 were significantly increased during the high PM events. By comparing the two PM events, the volume median radius of fine mode particles and fine mode fraction of PM-YS were found to be considerably higher compared with those of PM-NK. Such different characteristics found in this study for the three LRT events indicate that optical and chemical analyses of aerosols using satellite and ground-based observations can give us the possibility of roughly identifying aerosol types (yellow dust or PM) and trajectories (passing through the Yellow Sea or North Korea). © 2020 Elsevier Ltd
关键词	Aerosols Geostationary ocean color imager (GOCI)Long-range transport (LRT)Particulate matter (PM)Yellow dust
语种	英语
scopus关键词	Air quality; Chemical analysis; Chemical properties; Depolarization; Dust; Geostationary satellites; Optical properties; Optical radar; Solar radiation; Temperature measurement; Trajectories; Aerosol optical property; Backward trajectory; Depolarization ratio; Fine-mode particles; Ground-based observations; Seoul , South Korea; Single scattering albedo; Temporal and spatial variation; Aerosols; aerosol; air quality; albedo; chemical property; climate conditions; comparative study; GOCI; ground-based measurement; long range transport; observational method; optical property; particulate matter; satellite altimetry; satellite data; aerosol; chemical composition; cold; concentration (parameter); controlled study; depolarization; North Korea; particulate matter 2.5; priority journal; refraction index; season; South Korea; time series analysis; volume; Yellow Sea; North Korea; Pacific Ocean; Seoul [South Korea]; South Korea; Yellow Sea; Satellites
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/248724
作者单位	Environmental Satellite Center, Climate and Air Quality Research Department, National Institute of Environmental Research (NIER), Hwangyeong-ro 42, Seogu, Incheon 22689, South Korea; Air Quality Research Division, Climate and Air Quality Research Department, National Institute of Environmental Research (NIER), Hwangyeong-ro 42, Seogu, Incheon 22689, South Korea
推荐引用方式 GB/T 7714	Choo G.-H.,Lee K.,Seo J.,et al. Optical and chemical properties of long-range transported aerosols using satellite and ground-based observations over seoul, South Korea[J],2021,246.
APA	Choo G.-H.,Lee K.,Seo J.,Kim S.-Y.,Lee D.-W.,&Shin H.-J..(2021).Optical and chemical properties of long-range transported aerosols using satellite and ground-based observations over seoul, South Korea.ATMOSPHERIC ENVIRONMENT,246.
MLA	Choo G.-H.,et al."Optical and chemical properties of long-range transported aerosols using satellite and ground-based observations over seoul, South Korea".ATMOSPHERIC ENVIRONMENT 246(2021).