Abstract:

By using the NCEP data of ice concentration from 1973—2002, seasonal and interannual variation of Antarctic sea ice concentration, as well as its relationship with Antarctic Sea ice Oscillation Index in the latest 30 years are studied .It is indicated that characteristic of the seasonal variation of Antarctic sea ice is that the coagulated period is longer than the thaw period.But Arctic sea ice coagulated period is the same as thaw period of sea ice basically. Second, there are clearly interannual change of Antarctic sea ice, and its area index appears uptrend with the trend rate of 28/10a.But Arctic sea ice area index is decrease and its trend rate is -3.5/10a.Third, Antarctic Sea-ice Oscillation index is a important parameter in the variation of Antarctic sea ice which is able to represent sea ice area change of 1/3 approximately with the oscillations cycle of 10 years, 3—5 years and 2 years.