期刊
ATMOSPHERIC ENVIRONMENT
卷 123, 期 -, 页码 288-297出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.08.019
关键词
PM2.5; Carbonaceous aerosol; Organic tracer; Lin'an; Yangtze River Delta; PSCF
资金
- National Natural Science Foundation of China [20877052, 41173097]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13078]
- Natural Science Foundation of Fujian Province [2011J05112]
One hundred and ten seasonal PM2.5 samples were collected at Lin'an (LA), a regional background site in the Yangtze River Delta (YRD) region of China, to study the chemical composition, seasonal variation and sources of carbonaceous aerosols in the YRD region. Concentrations of organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC) and composition of solvent-extractable organic compounds (SEOC) including n-alkanes, hopanes, PAHs, n-fatty acids and levoglucosan were analyzed. Back trajectory and potential source contribution function (PSCF) analysis were conducted to identify the possible source areas of PM2.5 at LA. PM2.5 concentration at LA ranged from 15.7 mu g m(-3) to 182.1 mu g m(-3) with an annual average of 59.7 mu g m(-3). A large part of the total carbon (OC + EC, 11.8 mu g m(-3)) was watersoluble (42% in winter and spring, 56% in summer and 49% in autumn). SEOC concentration showed distinct seasonal variation of higher in winter and lower in summer. The average concentrations of nalkanes and PAHs in winter (105 ng m(-3) and 55 ng m(-3) respectively) were 5 and 8 times of that in summer. Diagnostic ratios of PAHs and PSCF analysis suggested that vehicle emission was not the main source of PAHs at LA. Based on the levoglucosan concentration (annual average of 136 ng m(-3)), more than 15% of the OC at LA was from biomass burning. This data set provides useful information for the understanding of the characteristics of PM2.5 in the YRD region. (C) 2015 Elsevier Ltd. All rights reserved.
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