气候变化领域集成服务门户(CCPortal): Measurement report: Particle-size-dependent fluorescence properties of water-soluble organic compounds (WSOCs) and their atmospheric implications for the aging of WSOCs

CCPortal

DOI	10.5194/acp-22-465-2022
	Measurement report: Particle-size-dependent fluorescence properties of water-soluble organic compounds (WSOCs) and their atmospheric implications for the aging of WSOCs
	Qin, Juanjuan; Tan, Jihua; Zhou, Xueming; Yang, Yanrong; Qin, Yuanyuan; Wang, Xiaobo; Shi, Shaoxuan; Xiao, Kang; Wang, Xinming
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	465
结束页码	479
卷号	22 期号:1 页码:15
英文摘要	Water-soluble organic compounds (WSOCs) play important roles in atmospheric particle formation, migration, and transformation processes. Size-segregated atmospheric particles were collected in a rural area of Beijing. Three-dimensional fluorescence spectroscopy was used to investigate the optical properties of WSOCs as a means of inferring information about their atmospheric sources. Sophisticated analysis on fluorescence data was performed to characteristically estimate the connections among particles of different sizes. WSOC concentrations and the average fluorescence intensity (AFI) showed a monomodal distribution in winter and a bimodal distribution in summer, with the dominant mode in the 0.26-0.44 mu m size range in both seasons. The excitation-emission matrix (EEM) spectra of WSOCs varied with particle size, likely due to changing sources and/or the chemical transformation of organics. Size distributions of the fluorescence regional integration (regions III and V) and humification index (HIX) indicate that the humification degree or aromaticity of WSOCs was the highest in the particle size range of 0.26-0.44 mu m. The Stokes shift (SS) and the harmonic mean of the excitation and emission wavelengths (WH) reflected that pi-conjugated systems were high in the same particle size range. The parallel factor analysis (PARAFAC) results showed that humic-like substances were abundant in fine particles (< 1 mu m) and peaked at 0.26-0.44 mu m. All evidence supported the fact that the humification degree of WSOCs increased with particle size in the submicron mode (< 0.44 mu m) and then decreased gradually with particle size, which implied that the condensation of organics occurred in submicron particles, resulting in the highest degree of humification in the particle size range of 0.26-0.44 mu m rather than in the < 0.26 mu m range. Synthetically analyzing three-dimensional fluorescence data could efficiently reveal the secondary transformation processes of WSOCs.
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:000746438700001
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/273088
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; China University of Geosciences
推荐引用方式 GB/T 7714	Qin, Juanjuan,Tan, Jihua,Zhou, Xueming,et al. Measurement report: Particle-size-dependent fluorescence properties of water-soluble organic compounds (WSOCs) and their atmospheric implications for the aging of WSOCs[J],2022,22(1):15.
APA	Qin, Juanjuan.,Tan, Jihua.,Zhou, Xueming.,Yang, Yanrong.,Qin, Yuanyuan.,...&Wang, Xinming.(2022).Measurement report: Particle-size-dependent fluorescence properties of water-soluble organic compounds (WSOCs) and their atmospheric implications for the aging of WSOCs.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(1),15.
MLA	Qin, Juanjuan,et al."Measurement report: Particle-size-dependent fluorescence properties of water-soluble organic compounds (WSOCs) and their atmospheric implications for the aging of WSOCs".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.1(2022):15.