| 北京城区夏季VOCs初始体积分数特征及来源解析 |
| 摘要点击 970 全文点击 251 投稿时间：2022-12-26 修订日期：2023-03-09 |
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| 中文关键词 挥发性有机物（VOCs） 北京 初始体积分数 来源解析 浓度权重轨迹（CWT） |
| 英文关键词 volatile organic compounds （VOCs） Beijing initial mixing ratio source apportionment concentration-weighted trajectory（CWT） |
| 作者 | 单位 | E-mail | | 张博韬 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | zbt881109@163.com | | 景宽 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | | | 王琴 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | | | 安欣欣 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | anxinxin2002@163.com | | 鹿海峰 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | | | 王陈婧 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | | | 王友峰 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | | | 刘保献 | 北京市生态环境监测中心, 北京 100048
大气颗粒物监测技术北京市重点实验室, 北京 100048 | |
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| 中文摘要 |
| 为明确北京市夏季VOCs体积分数特征及来源,在2022年5~8月对北京城区VOCs开展了连续监测并利用光化学比值法计算了初始体积分数.结果表明：①研究期间,北京城区初始φ（TVOCs）为（30.0 ± 11.5） × 10-9,其中含氧VOCs和烷烃占比达到34.2%和33.2%,体积分数较高的物种是丙酮、乙烷、乙醛和丙烷等低碳物质.②北京城区初始TVOCs体积分数略微呈现单峰变化趋势,11：00达到峰值,下午略有降低.③各排放物质中对O3生成贡献较大的主要是异戊二烯、乙醛、正丁醛和乙烯等物质,而对二次有机气溶胶生成贡献较大的主要是甲苯、异戊二烯、间/对-二甲苯和乙苯物质.④基于初始体积分数的PMF解析发现,老化背景及二次源（30%）对北京市VOCs贡献率最高,机动车源（25%）则是最主要的一次人为源,此外溶剂及燃油挥发源贡献率16%,燃烧源贡献率11%,工业过程源贡献率9%,天然源贡献率9%.⑤影响北京市的人为源主要来自东部和南部区域,天然源则来自西部和西北部区域.研究显示,应进一步削减机动车排放,开展区域联防联控降低整个区域VOCs水平是最终控制北京市VOCs的有效手段. |
| 英文摘要 |
| To clarify the characteristics and source apportionment of the VOCs initial mixing ratio in Beijing in summer, continuous monitoring of VOCs was conducted in the Beijing urban area from May to August 2022, and the initial mixing ratio was calculated using the photochemical ratio method. The results showed that:① during the study period, initial φ(TVOCs) in the Beijing urban area were (30.0 ±11.5)×10-9, in which the proportion of VOCs and alkanes containing oxygen reached 34.2% and 33.2%, respectively. The species with high volume fractions were low carbon substances such as acetone, ethane, acetaldehyde, and propane. ② The initial TVOCs mixing ratio in Beijing showed a slightly unimodal trend, reaching the peak at 11:00 and slightly decreasing in the afternoon. ③ Isoprene, acetaldehyde, n-butanal, and ethylene were the major contributors to the generation of O3, whereas toluene, isoprene, m-paraxylene, and ethylbenzene were the major contributors to the generation of secondary organic aerosols. ④ Based on the initial mixing ratio of PMF analysis, it was found that aging background and secondary sources (30%) contributed the most to VOCs in Beijing, and motor vehicle sources (25%) were the main primary human sources. In addition, solvent and fuel volatile sources contributed 16%, combustion sources contributed 11%, industrial process sources contributed 9%, and natural sources contributed 9%. ⑤ The anthropogenic sources of Beijing were mainly from the eastern and southern regions, whereas the natural sources were from the western and northwestern regions. This research showed that vehicle emissions should be further reduced, and regional joint prevention and control to reduce VOCs in the whole region is an effective means to control VOCs in Beijing. |
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