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地球瞬时自转轴相对于地球表面或历元平极的运动,简称极移.极移的主要特征是周年极移和Chandler极移.80年代以来,随着资料积累和观测精度的提高,人们开始从局限于周年和Chandler极移的研究扩展到对亚季节性、年际乃至几十年时间尺度极移的探讨.北大西洋涛动是英国气象学家Walker确定的全球三大气象涛动之一,其基本特征为:副热带反气旋带至冰岛附近副极区近南北方向、年际时间尺度上的气压振荡.根据固体地球-海洋-大气系统的总角动量守恒定律,大气、海洋的运动和质量再分布必然伴随着地球自转的变化.所以,本文将研究北大西洋涛动对年际时间尺度上地极运动激发的可能性.
The movement of the Earth’s instantaneous axis of rotation relative to the surface of the Earth or the epicenter is abbreviated as polar motion. The main features of polar motion are the annual pole shift and the Chandler pole shift. Since the 1980s, with the accumulation of data and the improvement of observation accuracy, From the research limited to the anniversary and the Chandler pole shift to the discussion on the sub-seasonal, interannual and even decades-scale polar migration. The North Atlantic Oscillation is one of the three major global meteorological fluctuations identified by the British meteorologist Walker , And its basic characteristics are as follows: the subtropical anticyclone moves to the near-north and north of the sub-polar region near Iceland and the atmospheric pressure oscillation on the interannual time scale.According to the law of conservation of total angular momentum of the solid earth-ocean-atmosphere system, The redistribution of mass must be accompanied by changes in the Earth’s rotation, so this article will explore the possibility of North Atlantic Oscillation (SST) triggering the geomagnetic anomalies on the interannual time scale.