Summertime (2020) Source Apportionment of Organic Aerosols in relation with their gaseous precursors, Volatile Organic Compounds, in the Paris region, France - Ineris - Institut national de l'environnement industriel et des risques Access content directly
Conference Papers Year : 2022

Summertime (2020) Source Apportionment of Organic Aerosols in relation with their gaseous precursors, Volatile Organic Compounds, in the Paris region, France

Jean-Eudes Petit
François Truong
  • Function : Author
  • PersonId : 1082405
Francesco Canonaco
  • Function : Author
A.S. Prévôt
  • Function : Author
Valérie Gros
  • Function : Author
  • PersonId : 1082404

Abstract

Organic aerosol (OA) particles are key pollutants in atmospheric chemistry, and have impacts on public health and climate (IPCC report, 2021). While their primary sources are rather well identified and quantified, the formation processes of secondary OA are still poorly understood, due to their complexity and high spatial and temporal variability. In the Paris region (France), the main primary sources of OA are traffic and residential wood burning, which have higher contributions at fall and wintertime. In summertime, secondary formation involving gaseous precursors (Volatile Organic Compounds, VOCs) is more important, due to their biogenic source being more abundant and meteorological conditions leading to more oxidation and condensation. As a matter of fact, an OA source apportionment study conducted on Aerosol Chemical Speciation Monitor (ACSM) measurements for the period 2012- 2018 at the SIRTA ACTRIS facility (located about 20km south-west Paris city center) highlighted 4 main factors: Hydrocarbon-like OA (HOA), Biomass-Burning OA (BBOA) as primary factors and Less-Oxidized Oxygenated OA (LOOOA) and More-Oxidized Oxygenated OA (MO-OOA) as secondary factors (Zhang et al, 2019). LO-OOA showed a seasonal pattern with higher levels in summer, suggesting being mostly from biogenic precursors’ oxidation. Knowledge on key organic gaseous precursors can help resolving the origins, notably using combined aerosol and VOCs mass spectra in receptor modeling approach such as Positive Matrix Factorization (PMF). For instance, Crippa et al. (2013) retrieved OA origins from AMS (Aerosol Mass Spectrometer) and PTRMS data from July 2009 and January-February 2010 in Greater Paris, including 2 primary and 4 secondary factors: LV-OOA, 2 SV-OOA – one from daytime processes and the other from nighttime processes – and a marine OA factor. Together with decennial continuous ACSM observations, VOCs are monitored since January 2020 at SIRTA using a Proton-Transfer-Reaction Quadrupole Mass-Spectrometer (PTR-Q-MS). In the present study, the ACSM and PTR-MS datasets are used to try and refine SOA sources during the summer season (2020). Results notably allow to investigate the links between the primary HOA-traffic factor and expected gaseous co-emissions. Among secondary factors, a daytime biogenic OOA factor could be mainly driven by isoprene OH-oxidation. A nighttime OOA factor could also be obtained, involving primary contributions from monoterpenes - which are mainly from biogenic origin but could also have anthropogenic sources, even in summer (Panopoulou et al, 2020) - and their oxidation by NO3 enhanced at lower temperatures. Furthermore, the comparison with results from Crippa et al. (2013) illustrate the temporal evolution of OA sources and pollution in the Paris region at a 10-years interval. This work was supported by H2020 Research Infrastructures ACTRIS projects (ACTRIS 2 (grant no. 654109)), the National Center for Scientific Research (CNRS), the French alternatives energies and Atomic Energy Commission (CEA), the French Ministry of Environment, the DIM-R2DS program from the Ile-de- France region and the long-term monitoring aerosol program SNO-CLAP. We gratefully thank Roland Sarda- Estève, Nicolas Bonnaire and Dominique Baisnée for their contribution in maintaining data acquisition at SIRTA.
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Dates and versions

ineris-03988930 , version 1 (14-02-2023)

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  • HAL Id : ineris-03988930 , version 1

Cite

Leïla Simon, Olivier Favez, Jean-Eudes Petit, François Truong, Caroline Marchand, et al.. Summertime (2020) Source Apportionment of Organic Aerosols in relation with their gaseous precursors, Volatile Organic Compounds, in the Paris region, France. 11. International Aerosol Conference (IAC 2022), Sep 2022, Athènes, Greece. ⟨ineris-03988930⟩

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