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《ACTA GEODAETICA ET CARTOGRAPHIC SINICA》 1997-02
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ISOSTATIC EFFECTS CAUSED BY QINGHAI XIZANG(TIBET) ICE SHEET LOADING DURING LATE PLEISTOCENE

Wang Hansheng\ Xu Houze\ Li Guoying (Laboratory of Dynamical Geodesy, Institute of Geodesy and Geophysics, Academia Sinica, Wuhan 430077)  
Based on the hypothesis presented by Kuhle (1987,1989) that an ice sheet existed in the Tibetan Highlands during late pleistocene, and on the deformation theory of viscoelastic earth under surface load, in this paper we first constructed the ice sheet loading model, and then computed the vertical displacement and gravity change on earth surface caused by the Ice Sheet which were considered as the maximum estimation of the glacial isostatic responses in the area. The numerical results showed that the ice loading isostasy may impact the uplift of the Highlands. In the centre of Ice Sheet, the uplift rate decreased by 1.0 ̄1.7 cm/a during glaciation, increased by 0.4 ̄1.2 cm/a during deglaciation and 0.5 ̄1.0 cm/a after deglaciation on average. In nowadays, the increase of uplift rate is 0.3 ̄0.4 cm/a with 0.5 ̄0.7 μGal/a of gravity change. The loading isostatic restoring will last at least another 10,000 years
【Fund】: 国家自然科学基金
【CateGory Index】: P227
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