长三角地区VOCs排放特征及其对大气O<sub>3</sub>和SOA的潜在影响

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Abstract Focusing on the Yangtze River Delta (YRD) region (including Jiangsu, Anhui, Zhejiang provinces, and Shanghai municipality), differences in the total emission amount, species composition, and spatiotemporal distributions between anthropogenic VOCs (AVOCs) and biogenic VOCs (BVOCs) were analyzed. The contributions of the VOCs from different sources to ozone (O₃) and secondary organic aerosol (SOA) generation potentials (i.e., OFP and SOAFP) were evaluated. The results showed that the total emission of VOCs in the YRD in 2017 was 6.18×10⁶t, where the AVOCs and BVOCs were 3.86×10⁶t and 2.32×10⁶t, respectively. The main components of VOCs in the YRD were alkanes, aromatic hydrocarbons, isoprene, methanol, and terpenes, accounting for 27.6%, 20.2%, 15.4%, 8.7%, and 6.1%, respectively. In terms of seasonal variations, AVOCs emission was relatively stable, while BVOCs emission showed significant seasonal variation in which the majority amount of BVOCs was emitted from May to September. In particular, the emission amount of BVOCs in July and August accounted for 40.3% of the total annual emission, significantly higher than that of the AVOCs in the same period. Alkene was the main VOCs specie in the period of May to September, while alkanes and aromatic hydrocarbons were the main VOCs species in other months. Spatially, high AVOCs emissions were generally found in economically developed regions such as Shanghai, south-central Jiangsu, northern Zhejiang, and central Anhui. In contrast, high BVOCs emissions were usually found in dense forest areas which were mainly distributed in Zhejiang and southern Anhui. The annual percentages of the contributions of AVOCs and BVOCs to the total OFP were 48.6% and 51.4%, respectively, and that to the total SOAFP were 46.3% and 53.7%, respectively. Shanghai and Jiangsu were dominated by AVOCs, while Zhejiang and Anhui were dominated by BVOCs. Although BVOCs emission in total in the YRD was less than AVOCs emission, it could have significant impacts on O₃ and SOA in the summer time, especially in Zhejiang and southern Anhui, where the contribution of BVOCs could be dominant. More attention should be given to the emission characteristics and potential impact of the BVOCs in relevant policy-makings toward pollution control of O₃ and fine particulates.

Key words： volatile organic compounds emission inventory AVOCs BVOCs OFP SOAFP

Received: 21 November 2022

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X511

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	ZHANG Ming-ming
	SHAO Min
	CHEN Pei-lin
	GU Chen
	WANG Qin-geng

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ZHANG Ming-ming,SHAO Min,CHEN Pei-lin等. Characteristics of anthropogenic and biogenic VOCs emissions and their potential impacts on O₃ and SOA in the Yangtze River Delta region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2694-2702.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2694

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