星期六 2026年 4月 18日
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地磁北极加速移向西伯利亚 科学家提早修正位置

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美国科学家刚修正“全球地磁模型”。

美国科学家刚修正“全球地磁模型”。

(华盛顿12日综合电)地磁北极的位置近年加速偏离,由北极群岛向俄罗斯西伯利亚方向移动。美国科学家以往每5年修正一次的“全球地磁模型”,现需提早一年至今年修正,以确保导航系统正常运作。

美国国家环境资讯中心发声明指,基于北极地区不按常规的变动,故提前至上周一(4日)更新全球地磁模型。据悉,地核的液态铁流动可改变地球的磁场线,造成所谓的磁极位移,令实际的地磁北极与地球转轴不对齐,且不断转变。

人类于1831年首次在加拿大北极群岛量度地磁北极,如今已向西伯利亚移动了2300公里。然而近年有加速趋势,地磁北极自2000年起的移动速度,由每小时15公里增至55公里,加速原因未明。地磁南极的移动速度则比北极慢得多。

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