Condensation nucleus size distribution at Mawson,Antarctica: Microphysics and chemistry |
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| Institution: | 1. College of Physics, International Center of Future Science, Jilin University, 2699 Qianjin Str., Changchun 130012, China;2. Taras Shevchenko National University of Kyiv, 60, Volodymyrska Str., Kyiv 01601, Ukraine;3. State Institution National Antarctic Scientific Center, 16, Taras Shevchenko Boulevard, Kyiv 01601, Ukraine;4. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, International Center of Future Science, Jilin University, 2699 Qianjin Str., Changchun 130012, China;5. School of Physics, Chemistry and Earth Sciences, University of Adelaide, 10 Pulteney Str., Adelaide 5005, Australia;6. Chang Guang Satellite Technology Co., Ltd, 1299, Mingxi Road, Changchun 130000, China;7. Ivan Franko National University of Lviv, 8, Kyryla i Methodia Str., Lviv 79005, Ukraine |
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| Abstract: | This work examines the annual evolution of the condensation nucleus (CN) size distribution and its relationship with other aerosol microphysical and chemical parameters in the lower atmosphere over Antarctica. Good agreement is observed between the seasonal cycles of aerosol volume and non-sea-salt sulfate. Changes between periods with strong bimodality and periods with a weak or missing nucleus mode are interpreted in terms of a seasonally varying precursor sulfur source strength and aerosol surface area. Although there are very limited measurements of SO2 concentration for this region, conditions under which these are consistent with the observed SO4 levels are considered. Overall, the observed relationships between microphysical and chemical properties of the aerosol strongly support the notion that the dominant source of nuclei in remote southern locations, including Antarctica, is maritime and that these nuclei result from the oxidation of dimethyl sulfide to methane sulfonate and sulfate. |
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