Nonpolar organic compounds as PM2.5 source tracers: Investigation of their sources and degradation in the Pearl River Delta, China

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Title:	Nonpolar organic compounds as PM2.5 source tracers: Investigation of their sources and degradation in the Pearl River Delta, China
Authors:	谷邁世;Wang, Qiongqiong;Feng, Yongming;Huang, X. H. Hilda;Griffith, Stephen M.;Zhang, Ting;Zhang, Qingyan;Wu, Dui;Yu, Jian Zhen
Contributors:	地球科學學院大氣科學學系
Keywords:	Alkanes;Apportionment;Aromatic compounds;Aromatic hydrocarbons;Atmospheric chemistry;Correlation analysis;Datasets;Degradation;Emissions;Geophysics;Hopanes;Organic compounds;organic source tracers;Particulate emissions;Particulate matter;Particulate matter sources;Photodegradation;Polycyclic aromatic hydrocarbons;River basins;Rivers;Seasonal variations;source apportionment;Spatial data;Suspended particulate matter;tracer stability;Tracers;Urban areas
Date:	2016-10-16
Issue Date:	2026-04-21 14:16:16 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： A group of nonpolar organic compounds (NPOCs) in five compound classes including alkanes, polycyclic aromatic hydrocarbons (PAHs), hopanes, steranes, and 1,3,5‐triphenylbenzene were quantified in samples of particulate matter of aerodynamic diameter less than 2.5 μm collected at four sites in the Pearl River Delta (PRD) region, China, over a 2 year period from 2011 to 2012. The four sites include industrial (Nanhai), urban (Guangzhou), urban outskirt (Dongguan), and suburban (Nansha) locations. Some NPOCs are uniquely emitted from particular combustion sources and thereby serving as markers in source apportionment. Based on this multiyear and multisite NPOC data set, spatial and seasonal variations, correlation analysis, and ratio‐ratio plots were used to investigate the source information and degradation of NPOC tracers. In summer, NPOCs showed distinct local emission characteristics, with urban sites having much higher concentrations than suburban sites. In winter, regional transport was an important influence on NPOC levels, driving up concentrations at all sampling sites and diminishing an urban‐suburban spatial gradient. The lighter NPOCs exhibited more prominent seasonal variations. Such spatiotemporal features suggest that their particle‐phase abundance is more influenced by temperature, which is a critical factor in controlling the extent of semivolatile organics partitioned into the aerosol phase. The heavier NPOCs, especially PAHs, showed negligible correlation among the four sites, suggesting more influence from local emissions. Ratio‐ratio plots indicate photodegradation and mixing of various sources for the NPOCs in the PRD. A positive matrix factorization (PMF) analysis of this large NPOC data set suggests that heavier NPOCs are more suitable source indicators than lighter NPOCs. Incorporating particle‐phase light NPOC concentrations in PMF produces a separate factor, which primarily contains those light NPOCs and likely is not a source factor. Total NPOC concentrations predicted using Pankow partitioning theory were explored as PMF inputs; however, the PMF solution is not able to fully explain the input total concentrations or to give reasonable source profiles, suggesting the need for reliable gas‐phase NPOC data before their use in source apportionment studies. In addition, degradation of NPOCs needs to be considered to avoid misinterpretation of PMF source apportionment results. Key Points Two‐year multisite nonpolar organic compound (NPOC) data set demonstrates the utility of NPOCs as tracers to reveal source variation Impact of light NPOC gas‐particle partitioning is significant to PMF‐resolved factor profiles but minor to factor contributions Ratio‐ratio plots provide evidence for PM NPOC degradation and a reason for caution to avoid source apportionment misinterpretation 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2016-10-16 出處： Journal of geophysical research. Atmospheres, 2016-10, Vol.121 (19), p.11,862-11,879 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2016. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-897X 識別號： EISSN: 2169-8996 識別號： DOI: 10.1002/2016JD025315
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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