北极海冰变化同我国气温相联系的若干统计学分析

Some Statistical Analyses of the Relationship Between the Air Temperature in China and the Arctic Sea-ice

本文分析了北极海冰覆盖度和我国气温的时空变化特点,并进行了它们之间的统计学分析。结果表明,我国某些地区,若干时段的气温较明显地受到北极海冰的影响。首先对北极海冰面积异常变化的时间尺度进行分析,然后使用经验正交函数(EOF)展开海冰场和气温场,并对它们的特征进行分析,最后对海冰面积在最大最小年份时,我国气温差值场进行分析。

In order to know the influence of the Arctic sea-ice extent on the surface air temperature over China, the relationship between them have been studied by using statistical analyses including the correlation calculation, difference fields, empirical orthogonal function, maximum entropy spectrum and power spectrum analyses. In this paper 372 monthly data of the sea-ice extent and the simultaneous air temperature data of 30 meterological stations over China are used. The results show that in some cases there are close correlations between the air temperature and the sea-ice extent. They have common change periods. We can find significant influence of the sea-ice areas in summer on the air temperature in winter, particularly in December and February, and the main influence is concentrated on the northern China.