Atmospheric particle evolution during a nighttime atmospheric mercury depletion event in sub-Arctic at Kuujjuarapik/Whapmagoostui, Québec, Canada.
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.
Gauchard
Pierre-Alexis
PA
Laboratoire de Glaciologie et Géophysique de l'Environnement du CNRS, 54 rue Molière, BP 96, 38402 Saint-Martin d'Hères, France.
Ferrari
Christophe P
CP
Dommergue
Aurélien
A
Poissant
Laurier
L
Pilote
Martin
M
Guehenneux
Gaëlle
G
Boutron
Claude F
CF
Baussand
Patrick
P