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本文基于SMMR和SSM/I海冰索引数据集,建立并分析了1978-11至2014-12月36年的南极海冰边缘线长度时间序列。南极冰缘线长度增长速度为19.54±16.31km/a(狆<0.05)。每年海冰范围从3月开始增长,9月达到峰值然后下降;冰缘线长度也呈现稳定的周期性变化,在3-8月缓慢增长,继而略微下降,11月开始迅速增长,12月到达峰值后迅速下降。通常冰缘线长度最大值出现在12月,最小值在3月。冰缘线长度的变化与海冰范围和海冰形状FRAC指数相关,在3月、11月、12月,冰缘线长度的变化趋势与海冰形状FRAC指数一致,与海冰范围相反。在其他月份冰缘线长度的变化趋势则与海冰范围相同,与海冰形状FRAC指数相反。在5个地理分区中,印度洋区、罗斯海区冰缘线长度呈正增长趋势,别林斯高晋海区呈明显负增长趋势,西太平洋区、威德尔海区变化趋势不明显。5个地理分区的冰缘线长度都只在个别月份呈现明显的趋势变化,大部分时间没有明显趋势。
Based on the SMMR and SSM / I Sea Ice Index datasets, this paper establishes and analyzes the 36-year Antarctic sea-ice edge line time series from November 1978 to December 2014. Antarctic ice edge length growth rate of 19.54 ± 16.31km / a (狆 <0.05). The annual sea ice range starts to increase from March, peaked in September and then decreased. The length of ice margin also showed a steady cyclical change. It slowly increased from March to August and then declined slightly. It began to grow rapidly in November and reached in December After the peak decreased rapidly. Usually the maximum length of the ice edge line appears in December, the minimum in March. The change of ice edge length is related to the range of sea ice and the FRAC index of sea ice shape. In March, November and December, the trend of ice edge length coincides with FRAC index of sea ice shape, opposite to that of sea ice. In other months, the trend of the length of the ice edge line is the same with that of the sea ice, contrary to the FRAC index of the sea ice shape. In the five geographical divisions, the length of the ice margin in the Indian Ocean and the Rose Sea region showed a positive growth trend, while that in the Belins high Jinjin area showed a negative growth trend, while the changes in the West Pacific and Weddell Sea areas were not obvious. The length of the ice edge of the five geographical sub-regions showed a significant trend change only in individual months, with no obvious trend for most of the time.