Wang Fanglin, Du Wei, Lv Shaojun, Ding Zhijian, Wang Gehui
Key Lab of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, 200241 China.
Institute of Eco-Chongming, Shanghai, 200062 China.
Adv Atmos Sci. 2021;38(7):1085-1100. doi: 10.1007/s00376-021-0317-6. Epub 2021 Apr 30.
As the key precursors of O, anthropogenic non-methane volatile organic compounds (NMVOCs) have been studied intensively. This paper performed a meta-analysis on the spatial and temporal variations of NMVOCs, their roles in photochemical reactions, and their sources in China, based on published research. The results showed that both non-methane hydrocarbons (NMHCs) and oxygenated VOCs (OVOCs) in China have higher mixing ratios in the eastern developed cities compared to those in the central and western areas. Alkanes are the most abundant NMHCs species in all reported sites while formaldehyde is the most abundant among the OVOCs. OVOCs have the highest mixing ratios in summer and the lowest in winter, which is opposite to NMHCs. Among all NMVOCs, the top eight species account for 50%-70% of the total ozone formation potential (OFP) with different compositions and contributions in different areas. In devolved regions, OFP-NMHCs are the highest in winter while OFP-OVOCs are the highest in summer. Based on positive matrix factorization (PMF) analysis, vehicle exhaust, industrial emissions, and solvent usage in China are the main sources for NMHCs. However, the emission trend analysis showed that solvent usage and industrial emissions will exceed vehicle exhaust and become the two major sources of NMVOCs in near future. Based on the meta-analysis conducted in this work, we believe that the spatio-temporal variations and oxidation mechanisms of atmospheric OVOCs, as well as generating a higher spatial resolution of emission inventories of NMVOCs represent an area for future studies on NMVOCs in China.
作为臭氧的关键前体物，人为源非甲烷挥发性有机化合物（NMVOCs）已得到深入研究。本文基于已发表的研究，对中国NMVOCs的时空变化、其在光化学反应中的作用及其来源进行了荟萃分析。结果表明，与中国中西部地区相比，东部发达城市的非甲烷碳氢化合物（NMHCs）和含氧挥发性有机化合物（OVOCs）混合比更高。烷烃是所有报告站点中最丰富的NMHCs物种，而甲醛是OVOCs中最丰富的。OVOCs在夏季混合比最高，冬季最低，这与NMHCs相反。在所有NMVOCs中，前八种物质占总臭氧生成潜势（OFP）的50%-70%，在不同地区具有不同的组成和贡献。在发达地区，冬季OFP-NMHCs最高，夏季OFP-OVOCs最高。基于正定矩阵因子分解（PMF）分析，中国的机动车尾气排放、工业排放和溶剂使用是NMHCs的主要来源。然而，排放趋势分析表明，溶剂使用和工业排放将超过机动车尾气排放，并在不久的将来成为NMVOCs的两大主要来源。基于本研究进行的荟萃分析，我们认为大气OVOCs的时空变化和氧化机制，以及生成更高空间分辨率的NMVOCs排放清单，是中国未来NMVOCs研究的一个领域。
