Seasonal variation and volatility of ultra-fine particles in coastal Antarctic troposphere

• Main Authors: Keiichiro Hara, Kazuo Osada, Chiharu Nishita-Hara, Masanori Yabuki, Masahiko Hayashi, Takashi Yamanouchi, Makoto Wada, Masataka Shiobara
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 2010
• Subjects: Geography (General); G1-922; Antarctic; The Antarctic; Syowa Station; Antarc*; Sea ice
• Online Access: https://doi.org/10.15094/00009573; https://doaj.org/article/059ccf0fadf544bf895d8cf5ada67309

The Size distribution and volatility of ultrafine aerosol particles were measured at Syowa Station during the 46-47 Japanese Antarctic Research Expeditions. During the summer, most of the ultrafine particles were volatile particles, which were composed of H_2SO_4, CH_3SO_3H and sulfates bi-sulfates. The abundance of non-volatile particles was ～ 20% during the summer, increasing to>90% in winter-spring. Non-volatile particles in winter were dominantly sea-salt particles. Some ultrafine sea-salt particles might be released from sea-ice. When air mass was transported from the free troposphere over the Antarctic continent, the abundance of non-volatile particles dropped to<30% even in winter.