Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower
Variations and sources of volatile organic compounds (VOCs) in urban region: insights from measurements on a tall tower
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城市地区挥发性有机化合物（VOC）的变化和来源：来自高塔测量的见解
DOI：
10.5194/acp-22-10567-2022
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发表时间：
2022-08
影响因子：
6.3
通讯作者：
Min Shao
中科院分区：
文献类型：
--
作者：
Xiao-Bing Li;Bin Yuan;Sihang Wang;Chunlin Wang;Jing Lan;Zhijie Liu;Yongxin Song;Xianjun He;Yibo Huangfu;Chenglei Pei;Peng Cheng;Suxia Yang;Jipeng Qi;Caihong Wu;Shan Huang;Yingchang You;Ming Chang;Huadan Zheng;Wenda Yang;Xuemei Wang;Min Shao
抽象。挥发性有机化合物（VOCs）是臭氧和颗粒物的主要前体物质，它们是城市环境中的两种主要空气污染物。然而，城市高空空气中VOCs的组成和来源至今鲜有报道。为了解决这个问题，在中国广州塔450米的平台上，利用质子转移反应飞行时间质谱仪（PTR-ToF-MS）对VOCs进行了高时间分辨的测量。现场测量和建模技术相结合，用于表征挥发性有机化合物的变化和来源。从正矩阵分解（PMF）分析中确定了五个来源，即白天混合（例如，生物源排放和次生形成），与访客相关的（例如，人的呼吸、烹饪和含乙醇产品的挥发）、车辆工业、区域运输和挥发性化学产品（VCP）（即，个人护理产品的挥发），分别平均占总VOC（TVOC）混合比的21%、30%、28%、10%和11%。我们观察到，游客相关的来源，主要由乙醇，其次是游客数量的变化对塔井的贡献。VCP占主导地位的来源在活动期间的平均贡献仅为10.57ppb，占TVOC混合比的一小部分（11%），但占总OH反应性的一大部分（22%）。然而，大部分反应性VOC物质，例如，单萜（49%）归因于VCP占主导地位的来源，表明VCP对城市环境中这些物种的环境浓度有重要贡献。在5、118、168和488 m处测量的空气污染物（即NOx、臭氧、Ox和PM2.5）的垂直廓线，由于夜间边界层的稳定性更强，夜间比白天表现出更明显的梯度。当450 m平台位于夜间残留层时，夜间VOC组分的混合比一般随时间的推移而降低，当受到地面排放的影响时，混合比明显增加。研究结果揭示了城市高空大气中VOCs的组成特征和来源，为制定VOCs和二次污染物的控制策略提供了参考。
Abstract. Volatile organic compounds (VOCs) are key precursors of ozone and particulate matter, which are the two dominant air pollutants in urban environments. However, compositions and sources of VOCs in urban air aloft have rarely been reported so far. To address this matter, highly time-resolved measurements of VOCs were made by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) at a 450 m platform on the Canton Tower in Guangzhou, China. A combination of in situ measurements and modeling techniques was used to characterize variations in and sources of VOCs. Five sources were identified from positive matrix factorization (PMF) analysis, namely daytime mixed (e.g., biogenic emissions and secondary formation), visitor-related (e.g., human breath, cooking, and volatilization of ethanol-containing products), vehicular–industrial, regional transport, and volatile chemical product (VCP) (i.e., volatilization of personal care products), contributing on average to 21 %, 30 %, 28 %, 10 %, and 11 % of total VOC (TVOC) mixing ratios, respectively. We observe that contributions of the visitor-related source, mainly composed of ethanol, followed with the variation in visitor numbers on the tower well. The VCP-dominated source only had an average contribution of ∼5.7 ppb during the campaign, accounting for a small fraction (11 %) of TVOC mixing ratios but a large fraction (22 %) of the total OH reactivity. However, large fractions of reactive VOC species, e.g., monoterpenes (49 %), were attributed to the VCP-dominated source, indicating important contributions of VCPs to ambient concentrations of these species in urban environments. Vertical profiles of air pollutants (namely NOx, ozone, Ox, and PM2.5), measured at 5, 118, 168, and 488 m, exhibited more evident gradients at night than in the daytime owing to the stronger stability of the nocturnal boundary layer. Mixing ratios of VOC species during the nighttime generally decreased with time when the 450 m platform was located in the nocturnal residual layer and markedly increased when impacted by emissions at ground level. The results in this study demonstrated composition characteristics and sources of VOCs in urban air aloft, which could provide valuable implications in making strategies for control of VOCs and secondary air pollutants.
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DOI：
--
发表时间：
2016
期刊：
--
影响因子：
--
作者：
A. Baudic
通讯作者：
A. Baudic
六旋翼无人机平台开发利用表征冬季边界层臭氧垂直分布
影响因子：
4.5
作者：
Chen Qian;Li Xiao-Bing;Song Ruifeng;Wang Hong-Wei;Li Bai;He Hong-Di;Peng Zhong-Ren
通讯作者：
Peng Zhong-Ren
影响因子：
5
作者：
Kun Zhang;G. Xiu;Lei Zhou;Qinggen Bian;Yusen Duan;Dongnian Fei;Dongfang Wang;Q. Fu
通讯作者：
Kun Zhang;G. Xiu;Lei Zhou;Qinggen Bian;Yusen Duan;Dongnian Fei;Dongfang Wang;Q. Fu
DOI：
10.1073/pnas.1714715115
发表时间：
2018-02-06
影响因子：
11.1
作者：
Karl T;Striednig M;Graus M;Hammerle A;Wohlfahrt G
通讯作者：
Wohlfahrt G
影响因子：
6.3
作者：
J. Liebmann;N. Sobanski;J. Schuladen;Einar Karu;H. Hellén;H. Hakola;Q. Zha;M. Ehn;M. Riva;L. Heikkinen;Jonathan Williams;H. Fischer;J. Lelieveld;J. Crowley
通讯作者：
J. Liebmann;N. Sobanski;J. Schuladen;Einar Karu;H. Hellén;H. Hakola;Q. Zha;M. Ehn;M. Riva;L. Heikkinen;Jonathan Williams;H. Fischer;J. Lelieveld;J. Crowley