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Two years of volatile organic compound online in situ measurements at the Site Instrumental de Recherche par Télédétection Atmosphérique (Paris region, France) using proton-transfer-reaction mass spectrometry
Earth System Science Data ( IF 11.4 ) Pub Date : 2023-05-15 , DOI: 10.5194/essd-15-1947-2023
Leïla Simon , Valérie Gros , Jean-Eudes Petit , François Truong , Roland Sarda-Estève , Carmen Kalalian , Alexia Baudic , Caroline Marchand , Olivier Favez

Abstract. Volatile organic compounds (VOCs) have direct influences on air quality and climate. They indeed play a key role in atmospheric chemistry as precursors of secondary pollutants, such as ozone (O3) and secondary organic aerosols (SOA). In this respect, long-term datasets of in situ atmospheric measurements are crucial for characterizing the variability of atmospheric chemical composition, its sources, and trends. The ongoing establishment of the Aerosols, Cloud, and Trace gases Research InfraStructure (ACTRIS) allows implementation of the collection and provision of such high-quality datasets. In this context, online and continuous measurements of O3, nitrogen oxides (NOx), and aerosols have been carried out since 2012 at the SIRTA (Site Instrumental de Recherche par Télédétection Atmosphérique) observatory, located in the Paris region, France. Within the last decade, VOC measurements were conducted offline at SIRTA, until the implementation of real-time monitoring which started in January 2020 using a proton-transfer-reaction quadrupole mass spectrometer (PTR-Q-MS). The dataset acquired during the first 2 years of online VOC measurements provides insights into their seasonal and diurnal variabilities. The additional long-term datasets obtained from co-located measurements (NOx, aerosol physical and chemical properties, meteorological parameters) are used to better characterize the atmospheric conditions and to further interpret the obtained results. Results also include insights into VOC main sources and the influence of meteorological conditions and air mass origin on their levels in the Paris region. Due to the COVID-19 pandemic, the year 2020 notably saw a quasi-total lockdown in France in spring and a lighter one in autumn. Therefore, the focus is placed on the impact of these lockdowns on the VOC variability and sources. A change in the behaviour of VOC markers for anthropogenic sources was observed during the first lockdown, reflecting a change in human activities. A comparison with gas chromatography data from the Paris city centre consolidates the regional representativity of the SIRTA station for benzene, while differences are observed for shorter-lived compounds with a notable impact of their local sources. This dataset could be further used as input for atmospheric models and can be found at https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 (Simon et al., 2022a).

中文翻译:

使用质子转移反应质谱法在 Site Instrumental de Recherche par Télédétection Atmosphérique(法国巴黎地区)对挥发性有机化合物进行了两年的在线原位测量

摘要。挥发性有机化合物 (VOC) 对空气质量和气候有直接影响。作为二次污染物的前体,例如臭氧 (O3) 和二次有机气溶胶 (SOA),它们确实在大气化学中发挥着关键作用。在这方面,现场大气测量的长期数据集对于表征大气化学成分、其来源和趋势的可变性至关重要。气溶胶、云和痕量气体研究基础设施 (ACTRIS) 的持续建立允许实施此类高质量数据集的收集和提供。在此背景下,自 2012 年以来,位于巴黎地区的 SIRTA(Site Instrumental de Recherche par Télédétection Atmosphérique)天文台对 O3、氮氧化物 (NOx) 和气溶胶进行了在线和连续测量,法国。在过去十年中,VOC 测量是在 SIRTA 离线进行的,直到 2020 年 1 月开始使用质子转移反应四极质谱仪 (PTR-Q-MS) 实施实时监测。在前 2 年的在线 VOC 测量中获得的数据集提供了对其季节性和昼夜变化的见解。从同一地点的测量(氮氧化物、气溶胶物理和化学特性、气象参数)获得的额外长期数据集用于更好地表征大气条件并进一步解释所获得的结果。结果还包括对 VOC 主要来源的深入了解,以及气象条件和气团起源对其在巴黎地区水平的影响。由于 COVID-19 大流行,值得注意的是,2020 年法国在春季实施了准全面封锁,在秋季实施了较轻的封锁。因此,重点放在这些封锁对 VOC 可变性和来源的影响上。在第一次封锁期间观察到人为来源的 VOC 标记物的行为发生变化,反映了人类活动的变化。与巴黎市中心的气相色谱数据进行比较,巩固了 SIRTA 苯站的区域代表性,同时观察到寿命较短的化合物的差异,这些化合物受当地来源的显着影响。该数据集可进一步用作大气模型的输入,可在 https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 找到(Simon 等人,2022a)。重点放在这些封锁对 VOC 可变性和来源的影响上。在第一次封锁期间观察到人为来源的 VOC 标记物的行为发生变化,反映了人类活动的变化。与巴黎市中心的气相色谱数据进行比较,巩固了 SIRTA 苯站的区域代表性,同时观察到寿命较短的化合物的差异,这些化合物受当地来源的显着影响。该数据集可进一步用作大气模型的输入,可在 https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 找到(Simon 等人,2022a)。重点放在这些封锁对 VOC 可变性和来源的影响上。在第一次封锁期间观察到人为来源的 VOC 标记物的行为发生变化,反映了人类活动的变化。与巴黎市中心的气相色谱数据进行比较,巩固了 SIRTA 苯站的区域代表性,同时观察到寿命较短的化合物的差异,这些化合物受当地来源的显着影响。该数据集可进一步用作大气模型的输入,可在 https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 找到(Simon 等人,2022a)。反映人类活动的变化。与巴黎市中心的气相色谱数据进行比较,巩固了 SIRTA 苯站的区域代表性,同时观察到寿命较短的化合物的差异,这些化合物受当地来源的显着影响。该数据集可进一步用作大气模型的输入,可在 https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 找到(Simon 等人,2022a)。反映人类活动的变化。与巴黎市中心的气相色谱数据进行比较,巩固了 SIRTA 苯站的区域代表性,同时观察到寿命较短的化合物的差异,这些化合物受当地来源的显着影响。该数据集可进一步用作大气模型的输入,可在 https://doi.org/10.14768/f8c46735-e6c3-45e2-8f6f-26c6d67c4723 找到(Simon 等人,2022a)。
更新日期:2023-05-15
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