In situ biomass burning enhanced the contribution of biogenic sources to sulfate aerosol in subtropical cities

被引：0
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作者：
Li, Tingting [1 ,2 ,3 ]
Li, Jun [1 ,2 ]
Xie, Luhua [1 ,2 ]
Lin, Boji [1 ,2 ,3 ]
Jiang, Hongxing [1 ]
Sun, Rong [4 ]
Wang, Xiao [1 ,2 ,3 ]
Liu, Ben [1 ,2 ,3 ]
Tian, Chongguo [4 ]
Li, Qilu [5 ]
Jia, Wanglu [1 ,2 ]
Zhang, Gan [1 ,2 ]
Peng, Ping'an [1 ,2 ]
机构：
[1] State Key Laboratory of Organic Geochemistry, State Key Laboratory of Isotope Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollutio
[2] CAS Center for Excellence in Deep Earth Science, Guangzhou,510640, China
[3] University of Chinese Academy of Sciences, Beijing,100049, China
[4] Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai,264003, China
[5] School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang,453007, China
来源：
Science of the Total Environment | 2024年 / 908卷
基金：
中国国家自然科学基金;
关键词：
Sulfurous gases released by biogenic sources play a key role in the global sulfur cycle. However; the contribution of biogenic sources to sulfate aerosol in the urban atmosphere has received little attention. Emission sources and formation process of sulfate in Guangzhou; a subtropical mega-city in China; were clarified using multiple methods; including isotope tracers and chemical markers. The δ18O of sulfate suggested that secondary sulfate was the dominant component (84 %) of sulfate aerosol; which mainly formed by transition metal ion (TMI) catalyzed oxidation (31 %) and OH radical oxidation (30 %). The factors driving secondary sulfate formation were revealed using a tree boosting model; which suggested that NH3; temperature; and oxidants were the most important factors. The δ34S of sulfate indicated that biogenic sources accounted for annual average of 26.0 % of the sulfate; which increased to 30.4 % in winter monsoon period. Rice straw burning enhanced sulfate formation by promoting the release of reduced sulfur from soil; which is rapidly converted into sulfate under a subtropical urban atmosphere with high concentration of NH3 and oxidants. This study revealed the important influence of rice straw burning on biogenic sulfur emission during the rice harvest; thereby providing insight into the sulfur cycle and regional air pollution. © 2023 Elsevier B.V;
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