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Sea salts and halogens in aerosols, frost flowers, and brine play animportant role in atmospheric chemistry in polar regions. Simultaneoussampling and observations of frost flowers, brine, and aerosol particles wereconducted around Siorapaluk in northwestern Greenland during December 2013 toMarch 2014. Results show that water-soluble frost flower and brine componentsare sea-salt components (e.g., Na+, Cl−, Mg2+, K+,Ca2+, Br−, and iodine). Concentration factors of sea-saltcomponents of frost flowers and brine relative to seawater were 1.14–3.67.Sea-salt enrichment of Mg2+, K+, Ca2+, and halogens (Cl−,Br−, and iodine) in frost flowers is associated with sea-saltfractionation by precipitation of mirabilite and hydrohalite. High aerosolnumber concentrations correspond to the occurrence of higher abundance ofsea-salt particles in both coarse and fine modes, and blowing snow and strongwinds. Aerosol number concentrations, particularly in coarse mode, areincreased considerably by release from the sea-ice surface under strong windconditions. Sulfate depletion by sea-salt fractionation was found to belimited in sea-salt aerosols because of the presence of non-sea-salt (NSS)SO42−. However, coarse and fine sea-salt particles were found to berich in Mg. Strong Mg enrichment might be more likely to proceed in finesea-salt particles. Magnesium-rich sea-salt particles might be released fromthe surface of snow and slush layer (brine) on sea ice and frost flowers.Mirabilite-like and ikaite-like particles were identified only in aerosolsamples collected near new sea-ice areas. From the field evidence and resultsfrom earlier studies, we propose and describe sea-salt cycles in seasonalsea-ice areas

Frost flowers and sea-salt aerosols over seasonal sea-ice areas in northwestern Greenland during winter–spring