程子桉, 庞小平, 赵羲, 季青. 1978~2014南极海冰边缘线长度时间序列变化[J]. 武汉大学学报 ( 信息科学版), 2016, 41(11): 1463-1468. DOI: 10.13203/j.whugis20150263
引用本文: 程子桉, 庞小平, 赵羲, 季青. 1978~2014南极海冰边缘线长度时间序列变化[J]. 武汉大学学报 ( 信息科学版), 2016, 41(11): 1463-1468. DOI: 10.13203/j.whugis20150263
CHENG Zian, PANG Xiaoping, ZHAO Xi, JI Qing. Analysis of Edge Length of Antarctic Sea Ice Time Series During 1978-2014[J]. Geomatics and Information Science of Wuhan University, 2016, 41(11): 1463-1468. DOI: 10.13203/j.whugis20150263
Citation: CHENG Zian, PANG Xiaoping, ZHAO Xi, JI Qing. Analysis of Edge Length of Antarctic Sea Ice Time Series During 1978-2014[J]. Geomatics and Information Science of Wuhan University, 2016, 41(11): 1463-1468. DOI: 10.13203/j.whugis20150263

1978~2014南极海冰边缘线长度时间序列变化

Analysis of Edge Length of Antarctic Sea Ice Time Series During 1978-2014

  • 摘要: 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 a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±16.31 km/a(p < 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。

     

    Abstract: Based on SMMR and SSM/I sea ice index dataset, we analyzed a consistent 36-year edge length of Antarctic sea ice from 1978.11 to 2014.12. In this period, the edge length of Antarctic sea ice expanded at the speed of 19.54±16.31 km/a(p < 0.05). Based on this analysis, it can be inferred that the sea ice extent grows from March and declines from September every year. The sea ice edge length grows slowly from March to August, followed with a slow decline. It rapidly increases in November, reaches a peak in December and then quickly falls. Generally, the maximum value of sea ice edge length occurs in December, and the minimum value turns up in March. Sea ice edge length is related to both the sea ice extent and fractal dimension. The fractal dimension shows the same trend as the sea ice edge length in March, November, and December, when the periodic ice edge length displays a trend opposite to the ice extent. In other months, the ice edge length exhibits the same trend as the ice extent and opposite the Fractal dimension. In conclusion, the Indian Ocean and Ross Sea sectors show positive yearly trends; the Bellingshausen Sea sector shows a negative yearly trend; the other two sectors show no obvious trend. All the five sectors show no obvious trend most of the time.

     

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