气候变化领域集成服务门户(CCPortal): Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes

CCPortal

DOI	10.5194/acp-22-13845-2022
	Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes
	Qin, Yuanyuan; Qin, Juanjuan; Wang, Xiaobo; Xiao, Kang; Qi, Ting; Gao, Yuwei; Zhou, Xueming; Shi, Shaoxuan; Li, Jingnan; Gao, Jingsi; Zhang, Ziyin; Tan, Jihua; Zhang, Yang; Chen, Rongzhi
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13845
结束页码	13859
卷号	22 期号:20 页码:15
英文摘要	Knowledge of the chemical structures and optical properties of water-soluble organic carbon (WSOC) is critical considering its involvement in many key aerosol-associated chemical reactions and its potential impacts on climate radiative forcing. This study investigates the coupled effects of pH and particle size on the chemical structures (functional groups) and optical properties (UV/fluorescence properties) of WSOC and further explores the source and aging of WSOC constituents. The results showed that the specific UV absorbance at a wavelength of 254 nm (SUVA(254)) and mass absorption efficiency at a wavelength of 365 nm (MAE(365)) were higher in smaller than larger particles, revealing the relatively higher aromaticity/molecular weight and more freshness of WSOC in smaller particles. A decrease in aromaticity/molecular weight of WSOC in larger particles was caused by the degradation reaction that occurred during the aging process. The carboxylic groups tend to be enriched in larger particles, whereas the contribution of phenolic groups was generally higher in smaller particles. The changes in the fluorescence peak position suggested that hydroxyl groups play a leading role in pH-responsive fluorescence in summer, while carboxylic and nitro groups play a dominant role in winter. Overall, the chromophores in smaller particles showed a more pronounced pH dependence, which might be related to the higher content of aromatic species in WSOC in these particle size ranges. Specifically, the climate impact of WSOC would be enhanced with increasing pH. The pH- and particle-size-dependent chemical and optical properties of WSOC provide insights into the structure, source, and aging of WSOC, which will ultimately improve the accuracy of assessing the climate effects of WSOC.
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:000874498100001
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/273144
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; ShenZhen Polytechnic; China Meteorological Administration; China University of Geosciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Qin, Yuanyuan,Qin, Juanjuan,Wang, Xiaobo,et al. Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes[J],2022,22(20):15.
APA	Qin, Yuanyuan.,Qin, Juanjuan.,Wang, Xiaobo.,Xiao, Kang.,Qi, Ting.,...&Chen, Rongzhi.(2022).Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),15.
MLA	Qin, Yuanyuan,et al."Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):15.