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	Biogenic volatile organic compounds dominated the near-surface ozone generation in Sichuan Basin, China, during fall and wintertime
	Huang, Dasheng1,2,3; Li, Qing1,4; Han, Yan1; Xia, Shi-Yong5; Zhou, Jiawei1; Che, Hanxiong1; Lu, Keding6,7; Yang, Fumo8; Long, Xin1; Chen, Yang1
	2024-07-01
摘要	The complex air pollution driven by both Ozone (O-3) and fine particulate matter (PM2.5) significantly influences the air quality in the Sichuan Basin (SCB). Understanding the O-3 formation during autumn and winter is necessary to understand the atmospheric oxidative capacity. Therefore, continuous in-site field observations were carried out during the late summer, early autumn and winter of 2020 in a rural area of Chongqing. The total volatile organic compounds (VOCs) concentration reported by a Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-ToF-MS) were 13.66 +/- 9.75 ppb, 5.50 +/- 2.64 ppb, and 9.41 +/- 5.11 ppb in late summer, early autumn and winter, respectively. The anthropogenic VOCs (AVOCs) and biogenic VOCs (BVOCs) were 8.48 +/- 7.92 ppb and 5.18 +/- 2.99 ppb in late summer, 3.31 +/- 1.89 ppb and 2.19 +/- 0.93 ppb in autumn, and 6.22 +/- 3.99 ppb and 3.20 +/- 1.27 ppb in winter. A zero-dimensional atmospheric box model was employed to investigate the sensitivity of O-3-precursors by relative incremental reactivity (RIR). The RIR values of AVOCs, BVOCs, carbon monoxide (CO), and nitrogen oxides (NOx) were 0.31, 0.71, 0.09, and -0.36 for late summer, 0.24, 0.59, 0.22, and -0.38 for early autumn, and 0.30, 0.64, 0.33 and -0.70 for winter, and the results showed that the O-3 formation of sampling area was in the VOC-limited region, and O-3 was most sensitive to BVOCs (with highest RIR values, > 0.6). This study can be helpful in understanding O-3 formation and interpreting the secondary formation of aerosols in the winter.
关键词	VOCs PTR-MS Model Ozone
DOI	10.1016/j.jes.2023.04.004
发表期刊	JOURNAL OF ENVIRONMENTAL SCIENCES
ISSN	1001-0742
卷号	141页码:215-224
通讯作者	Chen, Yang(chenyang@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:001159285100001
语种	en