Diogo Miguel Barros de Oliveira
PhD in Optique et Lasers, Physico-Chimie, Atmosphère
Thesis defended on 27th January 2017
Département Sciences de l’Atmosphère et Génie de l’Environnement, IMT Lille Douai


Title and thesis summary

Identification of the main sources and geographical origins of PM10 in the northern part of France

Airborne particles have significant economical, health and environmental impacts at a global scale. Mitigating their emissions to improve ambient air quality demands a deep knowledge on their sources, which can be determined by investigating their chemical composition. The present thesis aims at identifying major PM10 sources and geographical origins at 5 sampling sites (3 urban background, 1 traffic and 1 remote) representative of Northern France, which is frequently submitted to exceedances of limit values as defined by European Directives. The first step of this study included a comprehensive chemical characterization of PM10 filter samples collected every third day at the 5 sites. Organic matter and ammonium nitrate were confirmed as the main PM10 species in the investigated area with some differences according to the site type. Positive Matrix Factorization (PMF) was used to identify and quantify the contributions of primary sources as well as secondary processes impacting each sampling site. Large contributions of secondary aerosols (mainly grouped as nitrate-, sulfate- and oxalate-rich aerosols) were obtained at all sites, as well as significant traffic and biomass burning. The use of specific tracers like MSA and polyols also proved to be useful to identify marine and continental biogenic aerosols, respectively. Statistical trajectory-based model was applied to PMF outputs to calculate Concentration Field maps and locate emission sources of marine particles, namely fresh and aged sea salts (primarily from the Atlantic Ocean) and marine biogenic aerosols (mainly from the North Sea), as well as continental contributions of nitrate-and sulfate-rich secondary particles.

Refferees :
Willy MAENHAUT, Professeur, Ghent University
Jean-Luc JAFFREZO, Directeur de Recherche CNRS LGGE

Examiner :
Matthias BEEKMANN, Directeur de Recherche CNRS LISA

Thesis co-supervisors :
Esperanza PERDRIX, Maître-Assistante, Mines Douai
Stéphane SAUVAGE, Maître-Assistant, Mines Douai
Olivier FAVEZ, Ingénieur d'Etude et Recherche, INERIS

Thesis supervisor :
Véronique RIFFAULT, Professeure, Mines Douai

Laboratory : Département Sciences de l’Atmosphère et Génie de l’Environnement, IMT Lille Douai

Financing: Mines Douai/INERIS