STUDY ON THE OSCILLATION RELATIONSHIP BETWEEN SEA ICE OF THE ARCTIC AND ANTARCTIC

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In this paper, the Antarctic sea ice is divided into four regions : SPI1 (0°-120°E), the eastern Antarctic region; SPI2 (120°E-120°W), centered at the Ross Sea; SPI3 (120°W-0°), centered at the Weddell Sea. SPI4,the whole Antarctic sea region. The Arctic sea ice is divided into three regions : NPI1 (90°E-180°-90°W) on the Pacific-side; NPI2 (90°W-0°-90°E) on the Atlantic-side. NPI3,the whole Arctic sea region. In this paper, by mathematical statistical methods, the SIGRID polar sea ice data provided by WDC-A are used to analyze the interrelations between sea ice among the Arctic and Antarctic regions. It is found that complicated interactions exist between sea ice of the Arctic and Antarctic Regions with the most outstanding characteristics as follows : NPI2 plays a leading role in the interactions between the two Poles' sea ice. SPI3 is a positive feedback center affecting the Antarctic sea ice. SPI2 is a negative feedback center affecting the two Poles' sea ice. The strongest interactions among NPI2,SPI3 and SPI2 involve a quasi-periodic intensity variation between sea ice of the Antarctic and Arctic with cycle period of 5-6 years. This cycle period coincides with the principal period of NPI2 and SPI3 variations themselves. An oscillation relationship forms among NPI2,SPI3 and SPI2. The oscillation between SPI3 and SPI2 is of zonal nature while the oscillation between NPI2 and SPI3 or SPI2 is of meridional nature. This kind of oscillation is not at the same time but with a longer lag time difference. NPI2 lags SPI2 lag about 0.5-1 year; SPI3 lags SPI2 lag 2-12 months and 24-48 months; and SPI3 lags NPI2 lag 0.5-2 years.
国立極地研究所の論文

STUDY ON THE OSCILLATION RELATIONSHIP BETWEEN SEA ICE OF THE ARCTIC AND ANTARCTIC

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