气候变化领域集成服务门户(CCPortal): Measurement report: The 10-year trend of PM(2.5 )major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China

CCPortal

DOI	10.5194/acp-22-11557-2022
	Measurement report: The 10-year trend of PM(2.5 )major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China
	Chow, Wing Sze; Liao, Kezheng; Huang, X. H. Hilda; Leung, Ka Fung; Lau, Alexis K. H.; Yu, Jian Zhen
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	11557
结束页码	11577
卷号	22 期号:17 页码:21
英文摘要	Fine particulate matter (PM2.5) remains a major air pollutant of significant public health concern in urban areas. Long-term monitoring data of PM2.5 chemical composition and source-specific tracers provide essential information for the identification of major sources as well as evaluation and planning of control measures. In this study, we present and analyze a 10-year dataset of PM2.5 major components and source-specific tracers (e.g., levoglucosan, hopanes, K+, Ni, V, Al, and Si) collected over the period of 2008-2017 in an urban site in Hong Kong, China. The time series of pollutants were analyzed by the seasonal and trend decomposition using the locally estimated scatter plot smoothing (LOESS) method and general least squares with the autoregressive moving average method. Bulk PM2.5 and all its major components displayed a significant decline of varying degrees over the decade. PM2.5 was reduced by 40 % at -1.5 mu g m(-3) yr(-1). PM2.5 components that are predominantly influenced by local vehicular emissions showed the steepest decline, with nitrate decreasing by -66 %, elemental carbon by -60 %, and hopanes by -75 %, confirming effective control of local vehicular emissions. For components that are significantly impacted by regional transport and secondary formation, they had a notably lower percentage reduction, with sulfate declining by -40 % and organic carbon by -23 %, reflecting complexity in their region-wide contributing sources and formation chemistry. Levoglucosan and K+, two tracers for biomass burning, differed in their reduction extent, with K+ at -60 % and levoglucosan at -47 %, indicating they likely track different biomass burning types. Dust components in PM2.5 also decreased, by -37 % for Al and -46 % for Si. The year of 2011 was an anomaly in the overall trend in having higher concentrations of PM2.5 and components than its adjacent years, and the long time series analysis attributed the anomaly to unusually lower rainfall associated with strong La Nina events. This 10-year trend analysis based on measurements exemplifies the utility of chemical composition data in support of an evidence-based approach for control policy formulation.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000850848800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273226
作者单位	Hong Kong University of Science & Technology; Hong Kong University of Science & Technology
推荐引用方式 GB/T 7714	Chow, Wing Sze,Liao, Kezheng,Huang, X. H. Hilda,et al. Measurement report: The 10-year trend of PM(2.5 )major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China[J],2022,22(17):21.
APA	Chow, Wing Sze,Liao, Kezheng,Huang, X. H. Hilda,Leung, Ka Fung,Lau, Alexis K. H.,&Yu, Jian Zhen.(2022).Measurement report: The 10-year trend of PM(2.5 )major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(17),21.
MLA	Chow, Wing Sze,et al."Measurement report: The 10-year trend of PM(2.5 )major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.17(2022):21.