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DOI	10.5194/acp-23-963-2023
	Measurement report: Changes in light absorption and molecular composition ofwater-soluble humic-like substances during a winter haze bloom-decay processin Guangzhou, China
	Zou, Chunlin; Cao, Tao; Li, Meiju; Song, Jianzhong; Jiang, Bin; Jia, Wanglu; Li, Jun; Ding, Xiang; Yu, Zhiqiang; Zhang, Gan; Peng, Ping'an
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	963
结束页码	979
卷号	23 期号:2 页码:17
英文摘要	Water-soluble humic-like substances (HULIS) absorb light in near-UV and visible wavelengths and exert significant influence on the atmospheric environment and climate. However, knowledge on HULIS evolution during haze bloom-decay process is limited. Herein, PM2.5 samples were obtained during a winter haze event in Guangzhou, China, and the light absorption and molecular composition of HULIS were investigated by UV-Vis spectrophotometry and ultrahigh-resolution mass spectrometry. Compared with HULIS on clean days, the absorption coefficients (Abs(365)) of HULIS on haze days were significantly higher but the mass absorption efficiencies (MAE(365)) were relatively low, suggesting diverse and dynamic absorption properties of HULIS during haze episodes. The CHO and CHON compounds were the most abundant components in HULIS, followed by CHOS, CHONS, and CHN. Haze HULIS presented comparatively high molecular weight; a lower aromaticity index (AI(mod)); and higher O/C-w, O/N-w, and O/S-w ratios, indicating that HULIS fractions undergo relatively high oxidation during haze days compared to clean days. Moreover, CHON and CHO compounds with high AImod were the major potential chromophores in HULIS and significantly contributed to HULIS light absorption. It is worth noting that the proportions of these chromophores decreased during haze events, mainly owing to their higher oxidation during haze episodes. Besides, accumulated contribution of organic compounds emitted from vehicles and formed from reactions of biogenic volatile organic compounds (bio-VOCs) also diluted light-absorbing compounds in haze HULIS. These findings help us to understand HULIS evolution during haze bloom-decay processes in the subtropic region of China.
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:000918797700001
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/272978
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zou, Chunlin,Cao, Tao,Li, Meiju,et al. Measurement report: Changes in light absorption and molecular composition ofwater-soluble humic-like substances during a winter haze bloom-decay processin Guangzhou, China[J],2023,23(2):17.
APA	Zou, Chunlin.,Cao, Tao.,Li, Meiju.,Song, Jianzhong.,Jiang, Bin.,...&Peng, Ping'an.(2023).Measurement report: Changes in light absorption and molecular composition ofwater-soluble humic-like substances during a winter haze bloom-decay processin Guangzhou, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),17.
MLA	Zou, Chunlin,et al."Measurement report: Changes in light absorption and molecular composition ofwater-soluble humic-like substances during a winter haze bloom-decay processin Guangzhou, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):17.