【摘要】 本文研究由内核超速旋转引起的地球重力场的变化.论述了内核具有三个主要特征:椭球形状,各向异性对称轴与内核自转轴重合,内核自转轴与地球自转轴之间存在夹角并绕地球自转轴进动.内核超速旋转引起地球体系物质的重新分布,导致重力场变化.通过研究内核超速旋转的运动规律,建立了内核超速旋转导致重力场变化的模型,给出了由于内核超速旋转而引起的整个地球表面的重力变化,其中,在假定了内核超速旋转速率为1°/a的前提下,历经一年的最大重力变化量级约为0.37μGal.更多还原

【Abstract】 The Earth’s gravity field change caused by the inner core’s super rotation is investigated. It is dissertated that the inner core has three main characters: it has ellipsoidal shape; the anisotropic symmetric axis of the inner core coincides with its self-rotation axis; the rotation axis of the inner core is tilted to and processes around the Earth’s rotation axis. The inner core’s super rotation gives rise to the mass redistribution of the Earth system, and consequently results in the variation of the gravity field. By investigating the motion of the inner core’s super rotation, a model of gravity change caused by the inner core’s super rotation is established. Calculation results are provided about the gravity variations on the whole surface of the Earth caused by the inner core’s super rotation. Under the assumption of the super rotation rate 1°/a,the maximum gravity variation in one year is around 0.37 micro Gal.更多还原