05 Dec 2022
05 Dec 2022
Status: this preprint is currently under review for the journal ESSD.

Two years of Volatile Organic Compounds online in-situ measurements at SIRTA (Paris region, France) using Proton-Transfer-Reaction Mass Spectrometry

Leïla Simon1,2, Valérie Gros1, Jean-Eudes Petit1, François Truong1,a, Roland Sarda-Esteve1, Carmen Kalalian1, Caroline Marchand2, and Olivier Favez2 Leïla Simon et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement, Orme des Merisiers, 91190 Gif-sur-Yvette, France
  • 2Institut National de l’Environnement Industriel et des Risques, Parc Technologique ALATA, 60550 Verneuil-en-Halatte, France
  • anow at: Laboratoire Rhéologie et Procédés, 38610 Gières, France

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). To this respect, long-term datasets of in-situ atmospheric measurements are crucial to characterize the variability of atmospheric chemical composition, its sources and trends. The on-going establishment of the Aerosols, Cloud, and Trace gases Research InfraStructure (ACTRIS) allows implementing 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 observatory, located in the Paris region, France. Within the last decade, VOC measurements have been conducted offline at SIRTA, until the implementation of a 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 two years of online VOC measurements provides insights on 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 obtain results. Results also include insights on VOC’s 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 comprised a quasi-total lockdown in France in Spring, and a lighter one in Autumn. Therefore, a focus is made 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. This dataset could be further used as input for atmospheric models and can be found under (Simon et al, 2022).

Leïla Simon et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-406', Anonymous Referee #1, 04 Jan 2023
  • RC2: 'Comment on essd-2022-406', Anonymous Referee #2, 20 Jan 2023
  • EC1: 'Comment on essd-2022-406', Tobias Gerken, 31 Jan 2023

Leïla Simon et al.

Data sets

PTR-MS measurements in 2020-2021 Leïla Simon, Valérie Gros

Leïla Simon et al.


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Short summary
Long-term measurements of Volatile Organic Compounds (VOCs) have been set-up to better characterize the atmospheric chemistry at the SIRTA national facility (Paris area, France). Results obtained from the first two years (2020–2021) confirms the importance of local sources for short-lived compounds, as well as the role played by meteorology and air mass origins in the long-term analysis of VOCs. They also point out to a substantial influence of anthropogenic on the monoterpene loadings.