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Theses

Les aérosols:
émissions,
formation d'aérosols organiques secondaires,
transport longue distance
- Zoom sur les aérosols carbonés en Europe -

Abstract : There are two types of « carbonaceous aerosols » : “black carbon” (BC) and “organic carbon” (OC). BC is directly emitted in the atmosphere while OC is either directly emitted (primary OC, OCp) or secondarily formed through oxidation processses in the atmosphere (secondary organic aerosols, SOA). Complexity of carbonaceous aerosols is still poorly represented in existing aerosol models and uncertainties appear mainly both in their emission inventories and in their complex atmospheric evolution (transport, gas-particle interactions, dry/wet deposition), making difficult the estimation of their radiative impact. In this framework, I developed during my PhD at Laboratoire d'Aérologie, a new approach to deal with this complexity, with implementation of both a new carbonaceous aerosol emission inventory and a new aerosol modelling tool at global scale. My work is divided in 5 different tasks:
- better caracterisation of BC and OCp emissions, achieved through the development of a new emission inventory from fossil fuel and biofuel combustion sources (industrial, domestic and mobile sources). This inventory provides BC and OCp emissions for Europe at 25kmx25km resolution for the years 1990, 1995, 2000, 2005 and 2010, with two additional regional zooms: on France, at 10kmx10km resolution for the years 2000 and 2010 with improved road traffic, and in Marseille region (Escompte campaign, 1999,-2001) at 1kmx1km resolution for the year 1999;
- better modelling of carbonaceous aerosol complex atmospheric evolution, through coupling of a global scale gas transport/chemistry model (TM4) with an aerosol module (ORISAM) featuring size-distributed aerosols (on 8 diameter sections from 40nm to 10µm) organic/inorganic chemical composition and explicit treatment of SOA formation;
- simulations with this new aerosol model ORISAM-TM4 and model/measurements comparisons to study BC and OC long-range transport;
- sensitivity tests on SOA formation, involving enlarged set of volatil organic compounds, (precursors of the SOA) and more elaborated modelling of SOA hygroscopic properties (hydrophilic/hydrophobic SOA);
- first estimations of aerosol complex radiative properties on the basis of ORISAM-TM4 aerosol concentrations and assuming a 3 layer internally-mixed aerosol (RAD module).
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Bruno Guillaume. Les aérosols:
émissions,
formation d'aérosols organiques secondaires,
transport longue distance
- Zoom sur les aérosols carbonés en Europe -. Autre. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00145318⟩

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