气候变化领域集成服务门户(CCPortal): Diurnal and seasonal variation, chemical characteristics, and source identification of marine fine particles at two remote islands in South China Sea: A superimposition effect of local emissions and long-range transport

CCPortal

DOI	10.1016/j.atmosenv.2021.118889
	Diurnal and seasonal variation, chemical characteristics, and source identification of marine fine particles at two remote islands in South China Sea: A superimposition effect of local emissions and long-range transport
	Wu C.-H.; Yuan C.-S.; Yen P.-H.; Yeh M.-J.; Soong K.-Y.
发表日期	2021
ISSN	1352-2310
英文摘要	This study explored the spatiotemporal variation, chemical characteristics, and long-range transport of marine fine particles (PM2.5) at two remote islands in the South China Sea (SCS). Daytime and nighttime PM2.5 was simultaneously sampled at the Dongsha and Nansha Islands for determining its mass concentrations and chemical fingerprints. Field measurement results showed that high PM2.5 level occurred in winter and spring, particularly during the northeastern monsoon periods (NMPs), which blew anthropogenic PM2.5 to the SCS via continental outflow. In terms of diurnal variation, daytime PM2.5 concentrations were higher than those at nighttime in all seasons. Chemical analysis indicated that PM2.5 was dominated by water-soluble ions (WSIs) which were dominated by secondary inorganic aerosols (SIAs) (NO3−, SO42−, and NH4+). Crustal elements (Ca, K, Mg, Fe, and Al) were abundant of elements in PM2.5, but enrichment factor (EF) showed that trace elements (Ti, Cr, Mn, Ni, Cu, and Zn) were mainly originated from anthropogenic sources. The concentrations of organic carbon (OC) in PM2.5 were always higher than those of elemental carbon (EC). High concentrations of levoglucosan and organic acids were observed in winter and spring. The major source of PM2.5 was sea salts (16.8–24.8%), and followed by fugitive dust, secondary aerosols, oil-fired boilers, automobile sources, and biomass burning. Clustered trajectories indicated that polluted air masses were transported from mainland China, Korean Peninsula, and Japan Islands, particularly passing through industrialized and urbanized regions in East Asia during the NMPs. A superimposition phenomenon of local emissions and long-range transport (LRT) was observed in the SCS. The LRT of anthropogenic aerosols accounted for 54–79% of marine PM2.5. Overall, PM2.5 at the Dongsha Islands was highly influenced by LRT from Asian continental outflow, while PM2.5 concentrations observed at the Nansha Islands did not vary seasonally. © 2021 Elsevier Ltd
关键词	Chemical characteristics Marine PM2.5 Source identification South China Sea Spatiotemporal variation Superimposition phenomenon
语种	英语
scopus关键词	Aerosols; Chemical analysis; Organic carbon; Trace elements; Chemical characteristic; Diurnal variation; Long range transport; Marine PM2.5; PM 2.5; Remote islands; Sources identifications; South China sea; Spatio-temporal variation; Superimposition phenomenon; Oil fired boilers
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/248773
作者单位	Institute of Environmental Engineering, National Sun Yat-sen University, Taiwan; Aeroaol Science Research Center, National Sun Yat-sen University, Taiwan; Institute of Marine Biology, National Sun-Yat Sen University, Taiwan
推荐引用方式 GB/T 7714	Wu C.-H.,Yuan C.-S.,Yen P.-H.,et al. Diurnal and seasonal variation, chemical characteristics, and source identification of marine fine particles at two remote islands in South China Sea: A superimposition effect of local emissions and long-range transport[J],2021.
APA	Wu C.-H.,Yuan C.-S.,Yen P.-H.,Yeh M.-J.,&Soong K.-Y..(2021).Diurnal and seasonal variation, chemical characteristics, and source identification of marine fine particles at two remote islands in South China Sea: A superimposition effect of local emissions and long-range transport.ATMOSPHERIC ENVIRONMENT.
MLA	Wu C.-H.,et al."Diurnal and seasonal variation, chemical characteristics, and source identification of marine fine particles at two remote islands in South China Sea: A superimposition effect of local emissions and long-range transport".ATMOSPHERIC ENVIRONMENT (2021).