Dependence of aerosol sulfur particle size on relative humidity |
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| Affiliation: | 1. Radiation and Nuclear Safety Authority - STUK, Lähteentie 2, 96400, Rovaniemi, Finland;2. Sodankylä Geophysical Observatory, PO Box 3000, University of Oulu, Finland;3. Space Physics and Astronomy Research Unit, PO Box 3000, University of Oulu, Finland |
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| Abstract: | Ambient aerosol particle size fractions have been sampled by cascade impactors in laboratory experiments before and after humidification by air flow over a water surface. From PIXE analyses of each fraction mass median aerodynamic diameters, MMAD, of sulfur were computed. The increase in MMAD, found in 12 experiments covering the relative humidity range 10–97%, corresponded more closely to (NH4)2SO4 than to H2SO4 as the principal sulfur species present in particles < 2 μm aerodynamic diameter. |
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