Arctic aerosol size‐segregated chemical observations in relation to ozone depletion during Polar Sunrise Experiment 1992

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Abstract
During Polar Sunrise Experiment 1992 at Alert in the Canadian high Arctic, size‐fractionated observations of aerosol constituents (halogens, Na, V, As, Sb, Zn, Al, Ca, SO4=, Sm, K, Mn, and Mg) were made using a low‐pressure cascade impactor and a high‐volume virtual impactor (HVVI). Over 80% of the mass of V, Br, I, As, Sb, Zn, and SO4= was in particles 4=, NO3− has more mass in larger particles. Similarly, Cl peaked in larger particles (1.72 to 6.0 μm) than Na (0.49 and 1.72 μr). Both of these effects are likely caused by reactions of sulphate acids with salts of nitrates and chloride in submicrometer particles and the volatilization of HNO3 and HCl. For fine particles (diameter 3), soil (Ca, Al), and one loaded solely by Sm. For the whole period, there was a strong anticorrelation between O3 and aerosol Br but not with the other halogens. In this study, iodine was significantly linearly correlated with the square root of the Br concentration. It showed a weak anticorrelation with O3 only after polar sunrise but not before.