Detection of a large-scale mass redistribution in the terrestrial system since 1998
Detection of a large-scale mass redistribution in the terrestrial system since 1998
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DOI：
10.1126/science.1072188
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发表时间：
2002-08-02
期刊：
影响因子：
56.9
通讯作者：
Chao, BF
中科院分区：
文献类型：
--
作者：
Cox, CM;Chao, BF
根据过去25年的空间大地测量观测，地球的动态扁率（J（2））一直在下降，直到1998年前后，突然转为上升趋势，并一直持续到现在。J（2）的长期下降主要是由于冰后期地幔的反弹。目前的增加，其地球物理原因是不确定的，因此，标志着一个大的变化，在全球质量分布与J（2）的影响，大大掩盖了地幔反弹。
Earth's dynamic oblateness (J(2)) had been undergoing a decrease, according to space geodetic observations over the past 25 years, until around 1998, when it switched quite suddenly to an increasing trend that has continued to the present. The secular decrease in J(2) resulted primarily from the postglacial rebound in the mantle. The present increase, whose geophysical cause(s) are uncertain, thus signifies a large change in global mass distribution with a J(2) effect that considerably overshadows that of mantle rebound.