title: Atmospheric particle evolution during a nighttime atmospheric mercury depletion event in sub-Arctic at Kuujjuarapik/Whapmagoostui, Québec, Canada.
abstract: During a field experiment at Kuujjuarapik/Whapmagoostui (55.31 degrees N, 77.75 degrees W), Quebec, we observed increases of concentrations of particles with diameters larger than 0.3 microm in the ambient air during a nighttime atmospheric mercury depletion event (AMDE). These increases were strongly correlated with decreases of ozone and atmospheric mercury, and we also observed a change in the particle size distribution during this AMDE. Assuming that these phenomena imply either a chemical link or an association through transport, we also studied the nature of this AMDE. We hypothesize that the observed AMDE was a result of an influx of already depleted air masses and that it was not a product of local chemical reactions.
authors.affiliation: Laboratoire de Glaciologie et Géophysique de l'Environnement du CNRS, 54 rue Molière, BP 96, 38402 Saint-Martin d'Hères, France.
authors.forename: Pierre-Alexis
authors.initials: PA
authors.lastname: Gauchard
authors.forename: Christophe P
authors.initials: CP
authors.lastname: Ferrari
authors.forename: Aurélien
authors.initials: A
authors.lastname: Dommergue
authors.forename: Laurier
authors.initials: L
authors.lastname: Poissant
authors.forename: Martin
authors.initials: M
authors.lastname: Pilote
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Guehenneux
authors.forename: Claude F
authors.initials: CF
authors.lastname: Boutron
authors.forename: Patrick
authors.initials: P
authors.lastname: Baussand