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Continental drift of the rotation pole: observation and theory

机译:旋转杆的大陆漂移:观察和理论

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The Earth rotation pole moves with respect to the crust.Along with a nearly seasonal wobble of about 0.2”and other sub-seasonal oscillations of smaller amplitude,it drifts at longer periods.In light of astro-geodetic observations going back to 1890,this drift is composed of a linear time varying term and of a multi-decadal wobble.Linear trend is interpreted as the visco-elastic response of the Earth to the last deglaciation,however tectonic processes with mantle downwelling or upwelling could also account for a part of it.In this respect,it provides constrains on law mantle viscosity.According to last studies,decadal change of the mean pole path mostly reflects climatic changes through variation in the continental ice coverage.
机译:地球旋转杆相对于地壳移动。距离大约0.2英寸的几乎季节性摆动的圆形旋转杆和其他较小幅度的其他次季节振荡,它会在更长的时间内漂移。横梁的灯光率恢复到1890,这漂移由线性时间变化术语和多层摆动的。线性趋势被解释为地球的粘弹性响应到最后的下游,但是与地幔贫困或升值的构造过程也可以解释一部分它。在这方面,它提供了对法律地幔粘度的约束。根据上次研究,平均杆路道的二等变化主要是通过大陆冰覆盖的变化来反映气候变化。

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