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Atmospheric particle evolution during a nighttime atmospheric mercury depletion event in sub-Arctic at Kuujjuarapik/Whapmagoostui, Québec, Canada

Pierre-Alexis Gauchard 1 Christophe P. Ferrari 1, 2 Aurélien Dommergue 1 Laurier Poissant 3 Martin Pilote 3 Gaëlle Guehenneux 4 Claude F. Boutron 1, 5 Patrick Baussand 4
1 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
2 Polytech' Grenoble
3 SMC - Service Météorologique du Canada
4 GRECA - Groupe de Recherche sur l'Environnement et la Chimie Atmosphérique
5 UFR de Mécanique et de Physique
Abstract : During a field experiment at Kuujjuarapik/Whapmagoostui (55.31°N, 77.75°W), Québec, we observed increases of concentrations of particles with diameters larger than 0.3 μm 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.
Keywords : Atmospheric mercury depletion events Particles Ozone Transport
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Submitted on : Wednesday, April 8, 2009 - 1:27:12 PM
Last modification on : Tuesday, October 19, 2021 - 6:58:04 PM

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Pierre-Alexis Gauchard, Christophe P. Ferrari, Aurélien Dommergue, Laurier Poissant, Martin Pilote, et al.. Atmospheric particle evolution during a nighttime atmospheric mercury depletion event in sub-Arctic at Kuujjuarapik/Whapmagoostui, Québec, Canada. Science of the Total Environment, Elsevier, 2005, 336 (1-3), pp.215 à 224. ⟨10.1016/j.scitotenv.2004.05.022⟩. ⟨insu-00374351⟩

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