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LANDEX : étude des aérosols organiques secondaires (AOS) générés par la forêt des Landes

Abstract : Forest ecosystems affect air quality and climate, especially through the emissions and the reactions of biogenic volatile organic compounds (BVOCs) with the atmospheric oxidants, known to generate Secondary Organic Aerosols (SOAs). This work aims to improve our knowledge on the processes involved in biogenic SOA formation and fate. Two field campaigns have been conducted in the Landes forest. In a first step, the measurement site was characterized by a statistical study of local meteorological conditions. During these campaigns, complementary physical and chemical measurements have been carried out, implying measurements of fluxes and concentrations of particles, BVOCs and oxidants. The results evidenced nocturnal new particle formation, which is an original result as this process was usually only reported during daytime. The strong contribution of BVOCs (dominated by α- and β-pinene) ozonolysis to nocturnal new particle formation has been demonstated. Particle flux measurements suggested that particles are transfered from the canopy to the higher atmospheric surface layer. The comparison between ozone fluxes and a physical ozone deposition model also highlighted an ozone production source. This ozone production might be related to BVOC photooxidation.
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Submitted on : Thursday, April 13, 2017 - 11:32:08 AM
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Julien Kammer. LANDEX : étude des aérosols organiques secondaires (AOS) générés par la forêt des Landes. Chimie analytique. Université de Bordeaux, 2016. Français. ⟨NNT : 2016BORD0402⟩. ⟨tel-01507466⟩

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