气候变化领域集成服务门户(CCPortal): The evolutionary behavior of chromophoric brown carbon during ozone aging of fine particles from biomass burning

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DOI	10.5194/acp-20-4593-2020
	The evolutionary behavior of chromophoric brown carbon during ozone aging of fine particles from biomass burning
	Fan X.; Cao T.; Yu X.; Wang Y.; Xiao X.; Li F.; Xie Y.; Ji W.; Song J.; Peng P.
发表日期	2020
ISSN	16807316
起始页码	4593
结束页码	4605
卷号	20 期号:8
英文摘要	Biomass burning (BB) emits large amounts of brown carbon (BrC); however, the evolutionary behavior of BrC in BB emissions (BB BrC) resulting from complex atmospheric processes is poorly understood. In this study, the transformation of contents and the chromophoric characteristics of BrC in smoke particles emitted by the burning of rice straw (RS), corn straw (CS), and pinewood (PW) under O3 aging are investigated. The O3 aging induced the reduction of light absorption and fluorescence for the BB BrC, suggesting the decomposition of chromophores and fluorophores. These changes were accompanied by a decrease in aromaticity, average molecular weight, and the light absorption capacity for the chromophores, as well as an increase in humification for the fluorophores. The excitation emission matrix combined with a parallel factor analysis revealed that protein-like components (C3) were predominantly decomposed by O3 aging, while the relative distribution of a humiclike component with highly oxygenated chromophores (C4) gradually increased. In general, the humic-like substances (C1CC2CC4) were transformed to be the most abundant fluorophores for all the BB BrC samples, which accounted for 84 % 87% of the total fluorophores in final O3-aged BB BrC. Two-dimensional correlation spectroscopy (2D-COS) was performed on the synchronous fluorescence, which suggested that the RS and CS BrC exhibits the same susceptible fluorophores changes upon O3 aging. It showed that O3 firstly reacted with protein-like fractions (263 289 nm) and then with fulvic-like fractions (333 340 nm). In comparison, the changing sequence of susceptible fluorophores in the PW BrC to O3 was in the order of fulvic-like fluorophores with shorter wavelengths (309 nm), protein-like fluorophores (276 nm), and fulvic-like fluorophores with longer wavelengths (358 nm). The 2D-FTIR-COS (2D-COS combined with FTIR) analysis showed conjugated C=O and aromatic C=C and C=O groups were the most susceptible functional groups to O3 aging for all BB BrC. Moreover, it also revealed a consistent sequential change, which is in the order of aromatic OH; conjugated C=O groups and aromatic C=O; aromatic COO..; and finally lignin-derived C C, C H, and C O groups. Our results provide new insights into the evolutionary behavior of the chromophoric and fluorescent properties of BB BrC during O3 aging, which are of great significance for better understanding the heterogeneous oxidation pathways of BB-derived BrC in the atmospheric environment. © 2020 IEEE Computer Society. All rights reserved.
关键词	biomass burning brown carbon humic substance lignin oxidation ozone particulate matter wavelength Zea mays
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132087
推荐引用方式 GB/T 7714	Fan X.,Cao T.,Yu X.,et al. The evolutionary behavior of chromophoric brown carbon during ozone aging of fine particles from biomass burning[J]. Atmospheric Chemistry and Physics,2020,20(8).
APA	Fan X..,Cao T..,Yu X..,Wang Y..,Xiao X..,...&Peng P..(2020).The evolutionary behavior of chromophoric brown carbon during ozone aging of fine particles from biomass burning.,20(8).
MLA	Fan X.,et al."The evolutionary behavior of chromophoric brown carbon during ozone aging of fine particles from biomass burning".20.8(2020).