Origin of Aitken particles in remote regions of the Southern Hemisphere |
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| Authors: | E K Bigg J L Gras Christine Evans |
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| Institution: | (1) Cloud Physics Laboratory, Division of Atmospheric Research, CSIRO, Sydney, Australia |
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| Abstract: | Seasonal variations in total particle concentrations at five remote Southern Hemisphere sites in Samoa, Tasmania and Antarctica are compared. The dominant particle production mechanism is deduced to be photochemical, with concentrations dictated by the availability of radiation in the eight months centred on the winter solstice. There is little variation with latitude in the mean summer concentrations. The middle troposphere is shown to act as an important reservoir of photochemically-produced particles in Tasmania and probably in the Antarctic. It is suggested that primary-particle production is mainly through the oxidation of dimethyl sulphide and that these particles then act as centres of condensation for sulphuric acid formed by the oxidation of sulphur dioxide. |
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| Keywords: | Background aerosol Aitken nuclei particle origin |
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