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Communication Dans Un Congrès Année : 2023

Observations of trace gases above & below a forest canopy during ACROSS

Sébastien Dusanter
Alexandre Tomas
Estephanie Alhajj Moussa
  • Fonction : Auteur
Jérôme Houny
  • Fonction : Auteur

Résumé

The ACROSS campaign (Atmospheric chemistry of the suburban forest) is a collaborative effort to better understand how the mixing between urban and biogenic air masses impacts atmospheric composition and reactivity. A main objective is to provide a detailed description of physico-chemical processes involved in atmospheric transformations of biogenic Volatile Organic Compounds (VOCs), and the myriad of intermediate species formed as a consequence, which have yet to be characterized. This multi-platform campaign took place during summer 2022 for a duration of 6 weeks and included a supersite in the Rambouillet forest located on the path of pollution plumes from Paris. An unprecedented suite of analytical instruments was deployed at this site to probe air masses at the ground level and above the forest canopy using a 40-m tower. This presentation will focus on trace gas observations, including VOCs, ROx (OH+HO2+RO2) and selected inorganic species (O3, NOx – NO+NO2), both above and below the forest canopy. A descriptive analysis will be presented to highlight biogenic VOC oxidation regimes taking place under unpolluted (oceanic air masses) and polluted (Paris plumes) conditions, with a focus on primary/secondary species. Chemical compositions observed above and below-canopy will also be contrasted. On the basis of these observations, this presentation will highlight scientific questions related to ROx, VOC and NOx budgets that will be further investigated to fill important gaps in our understanding of biogenic VOC transformations and secondary organic aerosol formation.
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Dates et versions

hal-04222239 , version 1 (29-09-2023)

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Paternité

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  • HAL Id : hal-04222239 , version 1

Citer

Sébastien Dusanter, Joel F. de Brito, Ahmad Lahib, Alexandre Tomas, Jamar Marina, et al.. Observations of trace gases above & below a forest canopy during ACROSS. European Geosciences Union General Assembly 2023, Apr 2023, Vienna, Austria. ⟨hal-04222239⟩
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