Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Zou, Chunlin1,2,4; Cao, Tao1,2,4; Li, Meiju1,2,4; Song, Jianzhong1,2,3,5 ; Jiang, Bin1,2,3; Jia, Wanglu1,2,3; Li, Jun1,2,3; Ding, Xiang1,2,3; Yu, Zhiqiang1,2,3,5; Zhang, Gan1,2,3; Peng, Ping'an1,2,3,4,5
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| Measurement report: Changes in light absorption and molecular composition ofwater-soluble humic-like substances during a winter haze bloom-decay processin Guangzhou, China | |
| Source Publication | ATMOSPHERIC CHEMISTRY AND PHYSICS
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| ISSN | 1680-7316 |
| 2023-01-20 | |
| Volume | 23Issue:2Pages:963-979 |
| DOI | 10.5194/acp-23-963-2023 |
| Language | 英语 |
| WOS Research Area | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
| Abstract | 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. |
| WOS ID | WOS:000918797700001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/72478 |
| Collection | 有机地球化学国家重点实验室 |
| Corresponding Author | Song, Jianzhong |
| Affiliation | 1.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Environm Protect & Resource, Guangzhou 510640, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Guangdong Hong Kong Macao Joint Lab Environm Pollu, Guangzhou 510640, Peoples R China |
| Recommended Citation 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]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2023,23(2):963-979. |
| 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),963-979. |
| 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):963-979. |
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