Seasonal and intra-seasonal fluctuations of polar anticyclone and circumpolar vortex over Antarctica Kakegawa Hideo Yasunari Tetsuzo Kawamura Takeshi 国立極地研究所 Memoirs of National Institute of Polar Research. Special issue 03860744 45 0 19 29 1986-12 Fluctuations of the polar anticyclone at sea level and the circumpolar vortex at 500mb are examined by using daily sea level and 500-mb weather maps of 1983. In addition to the seasonal cycle, a remarkable intra-seasonal fluctuation with the period of about 30 days is noticed in the intensity of polar anticyclone and in the circumpolar vortex. It is also noticed that in the seasonal time scale the intensity of polar anticyclone and circumpolar vortex shows a positive correlation while in the intra-seasonal time scale these two are negatively correlated. 1986-12 110000010198 AA00733561 ENG CJPref NII-ELS 3 1 Seasonal and intra-seasonal fluctuations of polar anticyclone and circumpolar vortex over Antarctica Kakegawa Hideo Yasunari Tetsuzo Kawamura Takeshi National Institute of Polar Research Memoirs of National Institute of Polar Research. Special issue Fluctuations of the polar anticyclone at sea level and the circumpolar vortex at 500mb are examined by using daily sea level and 500-mb weather maps of 1983. In addition to the seasonal cycle, a remarkable intra-seasonal fluctuation with the period of about 30 days is noticed in the intensity of polar anticyclone and in the circumpolar vortex. It is also noticed that in the seasonal time scale the intensity of polar anticyclone and circumpolar vortex shows a positive correlation while in the intra-seasonal time scale these two are negatively correlated. Kakegawa Hideo Graduate School of Environmental Sciences, University of Tsukuba Yasunari Tetsuzo Institute of Geoscience, University of Tsukuba Kawamura Takeshi Institute of Geoscience, University of Tsukuba